System for detecting position of an underground object with usage of magnetic marker

FIELD: technology for finding concealed objects, for example, underground pipelines.

SUBSTANCE: system includes sensor device, having at least two sensors of magnetic field strength vector, positioned in parallel to each other for detecting only distorted magnetic field; device for transformation of direction and value of distorted magnetic field, detected by sensor device, into values for recording and then displaying values in form of letters, digits or graphic symbols; and magnetic marker, formed of magnetic material and attached to cylindrical pipeline. Magnetic marker has upper part and lower part. Lower part has curved structure, such, that center of magnetic material is perpendicular to ground. Polarity of magnetic field is indicated on upper part of magnetic marker.

EFFECT: error-free detection of position, fast attachment of marker to a pipeline, simple measurement of magnetic field.

7 cl, 9 dwg

 

The technical field

The present invention relates to a system for detecting an underground object that has a magnetic marker formed from a permanent magnet attached to an underground facility for the accurate measurement of the location of the underground object, and a database (DB)containing the data about the detected magnetic field of the magnetic marker and the corresponding location for the precise control of an underground facility in conjunction with GIS (geographic information system).

Description of the prior art,

Rapidly increasing urbanization, rapidly growing and laying of water pipelines, gas pipelines, power lines and telecommunications to create networks, such as electricity and telecommunications, and supply and water drainage. For the beauty of cities, and protection of equipment lines are usually located underground. However, not only insufficient information about the location of underground objects, but workers can't visually detect the location and condition of underground objects, so that the maintenance and repair of underground objects is difficult. In addition, when under ground place a new object or constructed a new building, the exact location of underground objects, which leads to waste of time and money. If construction work is carried out without accurate detection of Pozen the x objects underground facilities may be damaged or destroyed during construction activities that may result in personal injury work.

Typically, in order to discover the location of underground objects, different methods are used, including dissemination through the body of the earth e-waves, ultrasonic waves or sverkhotrazhenie waves and the detection of change in reflected wavelength through the environment and underground objects.

Was offered another conventional method, including the installation of a coil of the electromagnet on the upper part of the underground objects by means of magnetic induction and detection of the magnetic field of the current generated by the coil of an electromagnet, using a detector on the earth.

However, when the coil of the electromagnet inaccurately installed on the upper part of the underground facilities during excavation and backfilling, the location of underground facilities is not easy to detect. In the limiting case, the coil of an electromagnet may be lost.

In addition, since the aforementioned conventional methods detects the location of underground objects by analyzing the frequencies of the measured wavelength for detection of the location of underground objects require complex algorithms, such as Fourier transform, correction of errors and the test function analysis using expensive and lisaraye equipment.

Moreover, the conventional detector underground object has the following problems.

First, when detecting underground objects using magnetic detector, while the magnetic material is attached next to the underground facilities to enhance the changes in the earth's magnetic field, the magnetic material does not have focus, which complicates the recognition of a metal material and a magnetic material.

Secondly, because the conventional detector displays the detection results consistently, the operator is difficult to recognize the pattern of change of the detected values.

Thirdly, when the magnetic material used for amplification of changes in the earth's magnetic field, is attached to the cylindrical pipe, the magnetic material has an ordinary flat construction in contact with the pipeline, making it difficult to attach a magnetic material perpendicular to the ground. In the result, it is difficult to detect the exact position of the pipeline on the ground.

Brief description of the invention

Accordingly, the present invention was made to solve the above problems inherent in the prior art, and the aim of the present invention is to provide a system for locating an underground object, is able to prevent a breach of security when under the roadways to the construction due to a mismatch between the project and the design by measuring the pattern or rate of change of the magnetic field of the earth, generated depending on the direction of the magnetic force lines generated by the permanent magnet, and detecting a two-dimensional location of the underground object that has a magnetic marker, without any errors.

Another objective of the present invention is to provide a system for locating an underground object, allowing rapid insertion of the magnetic marker formed from a permanent magnet to the underground object, and a light measurement of the magnetic field by aligning magnetic field lines.

Another objective of the present invention is to provide a system for locating an underground object, with the ability to output the results of detection of various visual ways to contribute to the implementation of the different analyses by detecting the magnetic field generated by the magnetic marker, to convert values of digital data in the digital data to display data numerically or graphically.

To achieve these goals, a system is provided for locating an underground object that has a magnetic marker formed from a permanent magnet attached to an underground facility for the accurate measurement of the position of the underground object, and the database containing the data about the detected magnetic p is known, the generated magnetic marker, and the provisions of the measurements for precise control of underground objects in conjunction with GIS, the system includes a touch tool having at least two sensors of the magnetic field intensity vector, parallel to each other, for detecting the direction of the magnetic field of the earth for the correction of the earth's magnetic field and detecting only the distorted magnetic field conversion tool direction and magnitude of the distorted magnetic field detected by sensory means, the values of detection for memorizing values of detection and then display the values in the form of letters, numbers, or graphics; and the host of the magnetic marker, made of magnetic material and attached to a cylindrical pipe, the site of the magnetic marker has an upper part and a lower part, the lower part has a curved structure so that the center of the magnetic material perpendicular to the ground, and the polarity of the magnetic field is indicated on the upper part of the unit of the magnetic marker.

Brief description of drawings

The above and other objectives, features and advantages of the present invention will become more clear from the following detailed description in conjunction with the accompanying drawings, in which:

Figure 1 is a graph depicting the current distribution of magnetic force lines of a magnetic marker installed on the underground object, and method of detection;

Figure 2 is a block diagram of a control system of an underground facility in accordance with the present invention;

Figure 3 is a cross-section of the magnetic marker in accordance with the embodiment of the present invention;

Figure 4 is a top view of the magnetic marker in accordance with the embodiment of the present invention;

Figure 5 is a graph showing output characteristics of the magnetic sensor in accordance with the embodiment of the present invention;

6 is a graph showing the picture of changes in the values of the detection in accordance with the present invention;

Fig.7 is a graph showing the values of detection when scanning detector;

Fig is a graph showing the simulation result of the distribution of magnetic lines of force of the magnetic marker in accordance with the present invention; and

Fig.9 is a graph showing the simulation result of the density of magnetic force lines of the earth's surface.

Detailed description of preferred embodiments of the invention

First of all, will be described concept of the present invention.

In the United erwich, N-polarity magnetic marker, which is formed from a permanent magnet and attached to the upper end of the underground object, is always from the bottom up to maintain uniform direction of the magnetic lines of force generated by the magnet, thus evenly and uniformly maintaining a picture of the spatial changes in the earth's magnetic field (directional distortion of the earth's magnetic field). In the result, it is possible to recognize the metal component and the magnetic marker paintings by irregular changes in the earth's magnetic field due to the magnetic lines of force generated by the metal component of the underground facility or around the underground facility, magnetized in a natural way.

Secondly, the pattern of changes in the Earth's magnetic field is expressed visually by the detection values representing the output difference between the sensors of the vectors of the magnetic field installed directly on the magnetic detector, and the detection are generated sequentially due performance of the magnetic detection, so that the operator is difficult to remember the accumulated data of the sequential changes. Therefore, it is necessary for a certain period of time consistently save changes values of detection in high performance embedded memory is rubbish including the semiconductor storage device in the magnetic detector, and then display the values as a continuous graph, thereby allowing the operator to easily recognize the picture changes.

Thirdly, because the component perpendicular to the surface, generating magnetic lines of force among the magnetic force lines generated by the permanent magnet acts on the most distant point, the upper end of the magnetic marker must be attached to the underground object in the direction perpendicular to the ground. Because the underground pipeline typically has a cylindrical shape, the magnetic marker should have a curved structure at its lower end and mark the polarity at its upper end, so that the magnetic marker was easy to attach to the pipeline in the direction perpendicular to the ground.

In the following description and drawings, the same item numbers are used to designate same or similar elements, and thus can be omitted the description of the same or similar elements.

Figure 1 is a diagram showing the distribution of magnetic force lines of a magnetic marker that is installed on the underground object, and the method of its detection.

Magnetic marker 11 is made of a permanent magnet (ferrite)having a pre-zadanu the strength of the magnetic field, and provided with a Nickel coating, urethane surface coating and the like for water resistance and moisture resistance. When construction works for installation of the object 18, such as water pipes, lead pipes for domestic gas and power lines and telecommunications underground to the underground object 18 is attached magnetic marker 11.

The detector 10 of the underground object includes a support rod 15, the first induction sensor 12 and the second induction sensor 13 located on the supporting rod 15 for measuring the DC magnetic flux 14 magnetic marker 11. The first induction sensor 12 and the second induction sensor 13 are vector sensors measure the average magnetic component corresponding to each measuring axis.

In addition, having a first inductive sensor 12 and the second induction sensor 13 so that the polarity of the magnetic fields are opposite to each other, and adding the signals measured at the first and second induction sensors 12 and 13, components, generally incorporate two sensors, for example, the earth's magnetic field, can be eliminated, so that only the residual magnetic component.

The first induction sensor 12 located in the vicinity of the magnetic marker 11 has the value of magnetic what about the field significantly more than a fixed value of the second inductive sensor 13. Therefore, the difference between each value represents the intensity of the magnetic field of the magnetic marker 11 having a magnetic component, and the residual magnetic field is output through a loudspeaker or on a liquid crystal display mounted in the detector 10 of the underground object, when the measured magnetic field is strong or weak.

Figure 2 is a block diagram of a control system of an underground facility in accordance with the present invention.

Referring to figure 2, the first induction sensor 12 and the second induction sensor 13 is installed on the supporting rod 15 on its vertical axis. The first induction sensor 12 and the second induction sensor 13 is measured in its provisions magnetic field generated by the magnetic marker 11, and serves the measured magnetic field on the sign-in digital gradientunits 20.

Digital gradientunits 20 digitally mixes the input signals from the first induction sensor 12 and the second induction sensor 13. That is, the sensors 12 and 13 generate a frequency signal corresponding to the difference between the two input signals, and generates the magnitude of the converted frequency in the form of digital data.

The digital output data from the digital gradienter 20 is transmitted to the microprocessor 22 via the interface 21 centuries is Yes to output in numeric or graphic form. The microprocessor 22 includes storage means for receiving a digital signal corresponding to the magnetic field so that the magnetic field generated by the magnetic marker 11 can be designed to be expressed on the LCD display 24 via the interface 23 conclusion in alphabetical, numerical or graphical form.

In addition, the receiving part 32 GPS (global navigation and positioning) and part 33 connecting with the external system connected to the microprocessor 22. The receiving part 32 GPS can perceive current location detector 10 of the underground object via GPS. The received location information is processed by the microprocessor 22 and stored in the storage means 22 of the microprocessor 22.

Part 33 connecting with the external system connected to an external GIS system by means of a wire or wireless system to retrieve information about the subsurface in the study at the moment. The microprocessor 22 accesses the output digital data from the digital gradienter 20 for information about the current location from the receiving part 32 GPS, when it is confirmed that under the earth is magnetic marker 11, and extracts the underground information about the current location of the external GIS system through the om part 33, connecting with the external system. Then the microprocessor 22 compares and searches for information on underground facilities and the current location to determine whether the current location information about the subsurface, thus producing the result on the LCD display 24 via the interface 23 conclusion in alphabetical, numerical or graphical form.

In addition, the microprocessor 22 can receive information about the current location received by the receiving part 32 GPS, and underground objects, which should move the operator, thus giving information on the LCD display 24 in alphabetical, numerical or graphical form.

In addition, the digital output data from the digital gradienter 20 are sent to the input of d / a Converter 25 to provide a digital data in the form of external speech signal having the intensity corresponding to the digital data. D / a Converter 25 outputs the input digital data into an audio signal in analog form, with the range 0-25 C. the sensitivity Regulator 26 regulates the threshold voltage of the d / a Converter 25 for regulating the sensitivity of the signal.

The converted analog signal is processed in the regulating voltage is s generator 27 for to be the output signal in the audio frequency, and amplified by an amplifier 28 to be output as sound from the speaker 30. That is, the loudspeaker 30 is used to represent the magnitude of the difference signals regulating the voltage generator 27 is necessary to create a generation frequency corresponding to the difference signal to start the loudspeaker 30 and the amplifier 28 for reception of the output signal to start the loudspeaker 30. Volume 29 is connected to the amplifier 28 to control the volume.

In addition, the constant voltage source delivers energy +5 In the first induction sensor 12, the second induction sensor 13 and the digital gradientunits 20. D / a Converter 25, which regulates the voltage generator 27, and the volume control 28 is controlled by another constant voltage source. The cause separation of the voltage sources is to prevent false triggering of the sensor due to fluctuations of the DC voltage source.

In addition, the detector 10 underground facility mixes the output frequency from the first induction sensor 12 and the second induction sensor 13 to generate a signal characterizing the presence of a magnetic marker 11, thereby obtaining the difference between the measured MAG is item field and mixed frequency. The mixing is performed in a digital gradientbutton 20. The output signal from the digital gradienter 20 has a structure of data transmitted in parallel, changing depending on the magnitude of the mixed frequency. In addition, digital gradientunits 20 has an output signal representing the sign (binary) digit, which indicates which sensor is the first or second induction sensor 12 and 13 has a greater magnetic field. Therefore, the output signal "0" indicates that the two sensors have registered the same magnetic field, and the output signal of the maximum value (for example, 255) means that the two sensors have a large difference between the values of the magnetic field.

Digital gradientunits 20 measures the minimum and maximum values of the earth's magnetic field, automatically Gregoire within 10 to 20 seconds after the switch is turned on, although the time varies in accordance with the frequency of the crystal oscillator. At this time digital gradientunits 20 posted by North and South directions at the same angle that the earth's magnetic field. In addition, during calibration within 10 seconds after turning on the switch digital gradientunits 20 is rotated 180° to determine the sensitivity and the zero correction of the sensor, and correcting the errors caused by differences m the forward sensors.

The greatest difficulty maximize the operation of the detector 10 of the underground object is in mechanical placement of the first and second inductive sensors 12 and 13 so as to accurately align the axis of the first induction sensor 12 along the axis of the second induction sensor 13. In the present invention, the first induction sensor 12 is installed motionless, and then the second induction sensor 13 installed still using screw having non-magnetic properties. Thus, the operator aligns the axis of the first and second inductive sensors 12 and 13 by rotation of the screw to save a certain value measurements.

Fig.z is a cross-section of the magnetic marker 100 in accordance with the embodiment of the present invention, and figure 4 is a top view of the magnetic marker 100 in accordance with the embodiment of the present invention.

Referring to figure 3 and 4, the magnetic material 101 is formed from a permanent magnet, has the M-polarity in its upper part and S-polarity at its lower part. Position 102 is a coating of plastic, acrylic resin, etc. is deposited over the magnetic material 101 after the Nickel coating, urethane surface layer, etc. for water resistance and moisture resistance, which consists of the upper part 103 and the bottom is the second part 104.

The upper part 103 provided with a mark 105 polarity, indicating the polarity of the magnetic material 101, and the lower portion 104 has a curved structure so that the lower portion 104 can be easily attached to the object 18, such as a water pipe, inlet pipe for domestic gas and power lines and telecommunications under the earth, and the operator can easily find the position that is perpendicular to the ground.

As shown in figure 4, the N-polarity marked on the sign 105 the polarity of the magnetic marker 100.

In the method of attaching the magnetic marker 100 to the underground object for detecting an underground object using a magnetic field, when the magnetic material is permanently attached to host N-polarity in the upper part of the sign 105 polarity, and the values of detection on earth retain a certain pattern in accordance with the types of scan detector 10 may be easily divided naturally magnetized base metal or disrupt the magnetic field of the material around the underground facility and the magnetic marker 100, attached to the underground object, thereby eliminating detection errors.

In addition, in order to allow the operator to easily recognize the picture of the changing values of the detection values of the detection for one scan cycle of the detector 10 is stored in the semiconductor memory device is ve microprocessor 22, installed in the detector 10, a high-resolution continuous output values of the detection by the liquid crystal display 24 of the detector 10, thereby easily separating the magnetic marker 100 and the material that violates a magnetic field in the graphical form.

Then, as changes in the earth's magnetic field is proportional to the magnetic flux generated by the magnetic material attached to the underground object, in order to facilitate attaching a magnetic material to a cylindrical pipe in the direction perpendicular to the surface of the earth, the lower portion 104 of the magnetic marker 100 has a corresponding curved shape, and in order to maintain a uniform attachment of magnetic material, the token 105 polarity is provided on the upper part of the magnetic marker 100 in order to allow the operator to easily attach the magnetic marker 100 in accordance with the polarity.

Below the characteristics of the control system underground object using the polarity of the magnetic marker in accordance with the present invention will be described in conjunction with figure 5-9. Figure 5 is a graph showing the output characteristics of the magnetic sensor in accordance with the embodiment of the present invention; Fig.6 is a graph showing the picture changes meant the th detection in accordance with the present invention; Fig.7 is a graph showing the values of detection when scanning detector; Fig is a graph showing the simulation result of the distribution of magnetic lines of force of the magnetic marker in accordance with the present invention; and figure 9 is a graph showing the simulation result of the density of magnetic force lines of the earth's surface.

As can be seen from figure 5, the earth's magnetic field has a range of-0.5 GS ˜ +0.5 Gauss, + and - indicate the direction of the magnetic field of the earth.

In the present invention the first and second induction sensors 12 and 13 use sensors vector having direction as the induction type magnetic sensor. When the direction of the magnetic field of the earth coincides with the vertical axis of the first and second inductive sensors 12 and 13, a vector quantity has a maximum value, and when aligned with the horizontal axis, a vector quantity has a minimum value. Therefore, the difference vector between the first and second inductive sensors 12 and 13 corresponds to the magnitude of the change of the earth's magnetic field and the direction of the vector represents the position of the polarity of the magnetic marker 100.

That is, as shown in Fig.6 and 7, the picture changes in the values of the detection (the upper part of the magnetic marker 100 is formed so that h is ordinary to have N-polarity) is set more than "+" value, and the regular wave patterns. However, the base metal has irregular +/- structure without regularity detection values due to naturally magnetized properties of the base metal.

As shown in Fig and 9, it should be understood that the magnetic flux is distributed regularly around a vertical center point of the upper magnetic marker 100.

Although magnetic material 101 is shown as having a single permanent magnet, but is not limited to this, the magnetic material has many bar magnets coated.

As can be seen from the above, in accordance with the present invention can effectively and accurately detect the location of the underground object by aligning directions of the magnetic lines of force generated by the magnetic material, and the sensors of the magnetic field intensity vector magnetic detector for detection of the base metal and the magnetic marker by using the information about the directions of the magnetic field lines.

In addition, since the change of the earth's magnetic field is proportional to the magnetic flux generated by the magnetic material attached to the underground object, in order to facilitate attaching a magnetic material to a cylindrical pipe in the direction perpendicular to the surface of the earth, ninjacat magnetic marker has a corresponding curved shape, and in order to maintain a uniform attachment of magnetic material, the sign polarity is provided on the upper part of the magnetic marker in order to allow the operator to easily attach a magnetic token to its corresponding polarity.

In addition, the operator can easily recognize the result of the detection by introducing the measured magnetic field in digital or graphic form.

Here were uncovered lists as examples of embodiments of the present invention, and, although used in concrete terms, they are used and should be interpreted only in a General and descriptive sense only and not for limitation. Accordingly, specialists in this field it is clear that there may be changes in form and detail without going beyond the nature and scope of the present invention, installed the following claims.

1. System for locating an underground object, such as an underground cylindrical pipe containing the touch tool having at least two magnetic sensor of the magnetic field intensity vector, parallel to each other on the vertical axis of the support rod, designed to detect the magnetic field compensating the earth's magnetic field to detect only the OSD or the frame of the magnetic field; means for converting the direction and magnitude of the distorted magnetic field detected by sensory means, values to memory and then display the values in the form of letters, numbers, or graphics; and a magnetic marker, made of magnetic material and attached to the cylindrical pipe, and the magnetic marker has an upper part and a lower part, the lower part has a curved structure so that the center of the magnetic material perpendicular to the ground, and the polarity of the magnetic field is indicated on the upper part of the magnetic marker.

2. The system according to claim 1, in which the magnetic marker is covering the material with surface treated for water resistance and moisture resistance, and on the upper part of the magnetic marker includes a sign polarity, meaning the polarity of the magnetic field.

3. The system according to claim 2, in which the polarity of the magnetic field, indicated on the sign of polarity is an N-polarity.

4. The system according to claim 3 in which the means for converting includes

digital gradienter for forming a frequency corresponding to the frequency difference between the two output signals from the two sensors of the magnetic field intensity vector sensory means for outputting digital data;

digital to analog Converter for receiving digital d is the R to convert the value of the digital data into an analog signal;

regulating a voltage generator for outputting an analog signal generated by the d / a Converter, in the range of audio frequencies;

an amplifier for amplifying the output signal of the regulating voltage generator for directions in the form of sound;

the interface for inputting the output signal of the digital gradienter to the microprocessor;

a microprocessor for processing the output signal from the interface;

liquid crystal display for displaying output data from the microprocessor in digital or graphic form;

receiving the GPS part for receiving current location via GPS to input location information to the microprocessor; and

the part that connects with the external system, for connecting the input information from external GIS GIS system through a wire or wireless system.

5. The system according to claim 4, in which the microprocessor searches for information about your current location touch the funds received from the receptive part of the GPS, retrieves information about the underground object in the measurement from the GIS system to display information about the underground object corresponding to the obtained location on the LCD display.

6. The system according to claim 5 in which the means for converting supports znachenieprofessionalnyj, found on earth, in the form of a homogeneous pattern in accordance with the types of scanning to detect naturally magnetized base metal or material, making the magnetic disturbance under the earth, and the magnetic marker paintings by changing the values of detection.

7. The system according to claim 6, in which the function of the microprocessor memorizes the values of detection for one cycle of scanning with high resolution for constant output values of the detection by the liquid crystal display.



 

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EFFECT: remote determination of interfaces formed by inversions of the geomagnetic field in ice layers, enhanced depth of survey.

FIELD: geophysical electric prospecting.

SUBSTANCE: method can be used for ac geophysical electric prospecting which current is induced in ground by inductive method; method can be used for searching and prospecting objects as in non-conducting and conducting media. Low-frequency electromagnet field is induced by current running in non-grounded loop onto day surface of Earth. Phase shifts of components of magnetic induction are measured at preset height for parallel profiles relatively vertical component of magnetic induction along profile crossing epicenter of loop and being perpendicular to parallel profiles. Availability of abnormal conducting objects in Earth is determined from structure in phase shifts at the area.

EFFECT: improved precision of measurement; improved efficiency of aerial prospecting.

5 dwg

FIELD: geophysics.

SUBSTANCE: method comprises generating low-frequency electromagnetic field with the use of ungrounded loop at the day earth surface, measuring Cartesian components of magnetic induction from parallel profiles at given levels, measuring real and imaginary parts of the Cartesian components of the magnetic induction with respect to the phase of the vertical component of the magnetic induction in the epicenter of the ground loop, determining deviations of measured components from the normal values for a homogeneous medium, and determining sections of increased electric conductivity from the sign and magnitude of these values.

EFFECT: enhanced accuracy and efficiency of measuring.

5 dwg

FIELD: geology.

SUBSTANCE: method is based on measurements of electric field, excited using two electrodes. Distanced along supposed subject. Direction of field strength vector is determined on basis of results of measurements of its components in two orthogonal directions. As interpretation parameters value of difference of azimuths of strength vector observed and background, appropriate for homogenous substance, of electric fields, are used. On basis of character of deviation of force lines from background values, presence and position of non-homogenous areas is evaluated and detected.

EFFECT: broader functional capabilities.

2 dwg

FIELD: test equipment.

SUBSTANCE: system for finding coordinates of track and coordinates of defects of underground pipeline has navigation satellites and starting chamber marker. The latter has navigation receiver, processing and mating units, data storage, receiving chamber marker and track marker connected in series. Mentioned markers have marker receiver and navigation receiver connected in series with processing and mating unit, data storage and intra-pipe inspection tool. The latter has flaw detection module, synchronized reference generator, marker transmitter, route detector, computational and control unit, registrar, angular speed three-component meter, three-component accelerator and longitudinal accelerator, on-ground subsystem. Before making starting intra-tube inspection tool started, its sync reference generator is synchronized with time scale of satellite radar system. Data from flaw detector module is recorded into data registrar by means of intra-tube inspection tool, as well as in registrar of three-component angular speed meter, three-component accelerometer, longitudinal accelerometer, route detector, temperature detector and current time detector. Radar parameters and current time are recorded in marker of starting chamber. Radar parameters, time of passing of inspection tool and current time are recorded route markers and marker of starting chamber. Coordinate of pipeline and coordinates of flaws are calculated in on-ground subsystem on the base of stored data.

EFFECT: improved precision of coordinate finding.

4 dwg

FIELD: diagnosis and control.

SUBSTANCE: as source of electromagnetic field of cathode protection of pipeline is used. Depth of position of pipeline axis is determined on basis of magnetic transverse, longitudinal and vertical components of electromagnetic field of current of cathode protection of pipeline. longitudinal electric component of electromagnetic current field of cathode protection is measured and transverse component of electromagnetic field of current of cathode protection on the left and right from pipeline axes. Results of measurements are made normal for depth of pipeline, resistance of environment, surrounding pipeline, current force in pipeline, background components of electromagnetic fields. On basis of heightened values of normal electric components of electromagnetic field of cathode protection current position and size of disruptions of isolating cover of pipeline are detected.

EFFECT: higher efficiency.

2 dwg

FIELD: pipeline construction technologies.

SUBSTANCE: method shows presence and location of defects of metallic pipelines, includes measuring above pipeline in given points during movement of magnetic field vectors in rectangular coordinates, by at least two three-component sensors, tensor of magnetic field gradients is built, by matrix transformation received information is processed, on basis of results background value is estimated and deviations from this value, on basis of difference of which for given criterion value from background value presence and location of defects of metallic pipelines is decided and magnetic graph is built to show location of defects. Device for realization of method has registration sensors system, quartz generator, frequency divider, analog-digital converter, control block, threshold block, sound and light indication block, automatic battery charge indicator, block for calculation of magnetic field gradients, block for showing information, recording device segment, recording control block, situation alignment block, block for satellite absolute geographic alignment GPS, block for selecting recording segment.

EFFECT: broader functional capabilities, higher trustworthiness, higher efficiency.

2 cl, 4 dwg

FIELD: electro-surveying by inductive profiling method, possible use for studying composition of upper part of geological cross-section.

SUBSTANCE: method uses electromagnetic field source and receiving magnetic indicator distanced from one another. Mutual orientation of electromagnetic field source and receiving magnetic indicator is such, that in normal secondary electromagnetic field, excited in radiated geo-electric section without homogeneousness, measured component of magnetic field strength is close to zero. Profiling is performed by means of horizontal displacement relatively to boundary of earth-air splitting simultaneously of source of electromagnetic field and receiving magnetic indicator with discontinuous or continuous registration of abnormal component of magnetic field. On basis of its distribution, presence of geo-electric non-homogeneousness is determined.

EFFECT: increased efficiency and resistance to interference, decreased laboriousness.

1 dwg

FIELD: technology for finding deposits of oil and gas, possible use for finding hydrocarbon resources in carbon rocks of foundation of oil-gas containing precipitation beds.

SUBSTANCE: method includes taking samples from oil and gas bearing area with carbon foundation, adjacent to subterranean continental paleorift. Magnetic susceptibility of these is measured. On appearance of magnetic susceptibility values within range 13,0·106-31,0·106 presence of deposits is determined.

EFFECT: increased precision of finding deposits in carbon rocks of foundation, simplified method, lower costs.

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