Method of detecting small metal objects and device for realising said method
SUBSTANCE: detection zone in which the search object is located is exposed to low-frequency electromagnetic and microwave fields. The value of the low-frequency electromagnetic field sufficient for onset of mechanical vibrations of the search object in the detection zone is selected. The microwave signal reflected from the detection zone and modulated by mechanical vibration parametres of the search object is received. The useful signal with frequency Ω is isolated from the received modulated microwave signal, where Ω is frequency of mechanical vibration of the search object. The device has a low-frequency generator connected to an inductive radiator, an autodyne microwave transceiver with an antenna, a phase detector, a low-pass filter and a display.
EFFECT: increased sensitivity and reliability of detection.
2 cl, 2 dwg
The invention relates to the field of radiography and can be used for the detection of small objects made of precious metals, when control passes airports, sea ports and flow of industrial enterprises.
Known inductive apparatus for detecting metal objects in the detection zone [patent FR No. 2145679, MKI G01V 3/10, G08B 13/24, publ. 23.02.1973], containing at least one unit of inductance, the AC power source and the unit of processing of the received signal. The unit of inductance consists of a radiating coil, which is connected via adjustable coil connection with the detector coil. In the absence of a constant magnetic field produced by the radiating coil, a metal object by minimizing the mutual induction between the radiating and the detector coils on the output of the detector coil voltage is zero. An AC voltage source generating the signal in the frequency range from 200 to 4000 Hz, is connected with the radiating coil and the detector coil is connected to the processing unit of the received signal.
The closest technical solution is a device for the detection of metal objects in the search area [patent GB No. 1334295, MKI G01V 3/10, publ. 17.10.1973], comprising a transmitting circuit, a receiving circuit and an output unit. The transmitting circuit includes a master oscillator,which, through the pre-amplifier unit is connected to the transmitting coil. The master oscillator provides the sensing zone search of an electromagnetic signal with a certain level of energy per unit volume of the search area. Reception circuit consists of a receiving coil, the adder of the received signal, a summation transformer connected through one of the pre-amplifier of the transmitting circuit with zero-circuit, and the lock-in amplifier. The output of the selection circuit in the absence of a metal object in the search area offset voltage is zero. The output circuit includes a sensor unit phase, in parallel, connected to a post amplifier, and a block of phasers, United with one of the pre-amplifier of the transmitting circuit. The number of phasers equal to the number of phase sensors. Upon detection of a metal object in the search area there is a change in the amplitude and polarity of the output signal, and the polarity of the signal at the output of each sensor phase is judged on the type of metal (black or color).
The basis of the invention is to increase the sensitivity and reliability of detection of small metal objects that are made in the detection zone.
The problem is solved in that in the method of detection of small metal objects, based on excitation of the detection area of the low-frequency electromagnetic field and receive reflected from the zone detected by the mode signal, according to the invention additionally the detection zone is irradiated with the microwave field, select the amount of low-frequency electromagnetic field sufficient for the occurrence of mechanical vibration subject search in the detection zone, shall receive reflected from the detection zone of the microwave signal, modulated by the mechanical vibration of the object of the search, extracted from the received modulated microwave signal, the useful signal frequency Ω, where Ω is the frequency of mechanical vibration of the object of the search.
The problem is solved also by the fact that in the known device, containing a low-frequency generator connected to the induction radiator, added automatic UHF transceiver with an antenna, the first and second outputs of which are connected to first and second inputs of the phase detector, respectively, and the output of the phase detector through a low pass filter connected to the detection indicator.
Figure 1 presents the scheme of realization of the proposed method.
The subject 1 is placed in a low-frequency electromagnetic field
detection zone, the perimeter of which coincides with the average radius RGinduction emitter 3, fed by low-frequency oscillator 2. Under the action of low-frequency electromagnetic fieldszone about which Eugenia in the subject search 1 induced secondary eddy current I 2, the amplitude of which is equal to:
where- electromotive force induced harmonic current I1in the subject search 1;
µ=4π×10-7GN/m is the magnetic permeability of air;
R is the average radius of the subject 1, m;
RG- the average radius of induction emitter 3, m;
- resistance conductive ring with a cross-section of ∆ h, is equivalent to the subject of the search;
σ is the conductivity of the material of the subject 1, Cm/m;
h is the thickness of the object of search, m;
- the depth of the skin layer in the material of the subject search 1.
The Lorentz force arising from the interaction of the currents I1and I2and causing mechanical vibration of the subject 1 with frequency Ω=2πF and the deflection angle α from the initial horizontal position is determined by the expression:
We substitute the relation (1) in expression (2) and obtain the following equation for the determination of the Lorentz force acting on the subject of search 1:
Moreover, to ensure the vibrational displacement of the subject search 1 must comply with the following condition:
where P=ρπR2h - the weight of the item search 1;
ρ is the specific weight of the material of the object on the ska 1, kg/m3.
For the occurrence of mechanical vibration of the object search 1 frequency Ω=2πF pick up the value of the current amplitudeflowing in the induction emitter 3. From expressions (3) and (4) we obtain the desired value of the amplitude of the current I1to ensure the mechanical vibration of the object search 1:
As can be seen from expression (5), the value of current I1to ensure the mechanical vibration of the object search 1 depends on the frequency Ω and the mean radius of the induction emitter RΓ.
Additionally, the detection zone is irradiated with the microwave fieldfrequency ω=2πf with an antenna connected to the transceiver 4. Then admit reflected from the detection zone of the microwave signalthat is phase modulated by the frequency of vibration of searching Ω:
where Δφ(Ω) is the phase of the reflected microwave signal;
E∂and H∂the initial value of the amplitude of electric and magnetic components of the microwave fieldrespectively;
The phase of the reflected electromagnetic signal is determined by the following expression:
where Ω=2πF is the frequency of mechanical vibration of the subject 1;
K - coefficient of proportionality;
λ is the wavelength of the reflected electromagnetic field.
Substituting the value of α=90° in the expression (7), we find the maximum amplitude of the mechanical vibration of the object search 1:
As can be seen from expression (7), the phase of the reflected electromagnetic signal Δφ(Ω) depends on the parameters of the mechanical vibration of the object of the search and, therefore, from the dimensions and electrical parameters of the subject of search 1.
Subsequent phase demodulation of the received microwave signalallows you to extract useful signal containing information about the dimensions and electrical parameters of the subject 1. Changing the frequency Ω, it is possible to identify the subject of search 1 classes. Thus, the proposed method allows to detect with greater reliability small metal objects in the detection zone than in the known method.
Will give a quantitative estimate of the amplitude of mechanical vibration of the object of search 1.
Let the subject of the search is the disk of radius R=5×l0-3m and thickness h=1×10-3feet Material subject search - gold with conductivity σ=5×107Cm/m and a specific gravity ρ≈20×103kg/m Radius of induction emitter R =0.5 m, and the frequency of the primary magnetic field F=1 kHz. We substitute the above data into the expression (5) and get the I1>103Α. If induction emitter to perform in the form of a spiral with n=10 turns of wire, the required amount of current I1will be I1/n=100 A. the Phase shift Δφ(Ω)=1/57 glad≅1° at the wavelength of the primary electromagnetic microwave field λ=10 cm were obtained when the amplitude of the mechanical vibration of the object of the search is equal to
Figure 2 presents a functional diagram of a device that implements the inventive method.
Device detection of small metal objects contains low-frequency oscillator 2 with inductive emitter 3 and automatic microwave transceiver 4 with the antenna. The first output automatic microwave transceiver 4 (figure 2 denoted as ω±Ω with an arrow) connected to the first input of the phase detector 5, and the second output (figure 2 denoted as ω with an arrow) with a second input of the phase detector 5. The phase detector 5 through a low-pass filter 6 is connected to the detection indicator 7. Induction emitter 3 is made in the form of a framework in which current flows. Figure 2 also shows the microwave field, irradiating the detection zone, and the microwave signalreflected from the subject 1, in the cat the rum under the action of low-frequency electromagnetic fields the detection area of the induced current.
The device operates as follows.
Low-frequency oscillator 3 generates a currentfrequency Ω=2πF, flowing in the induction emitter 2, which in the detection zone is induced low-frequency electromagnetic field. At the same time automatic microwave transceiver 4 produces a microwave signalfrequency ω=2πf, through which the antenna irradiates the detection zone. When injected into the detection area of the subject 1, which under the action of low-frequency electromagnetic fieldsinduced eddy currentmechanically vibrates with a frequency Ω=2πF. The amplitude of the mechanical vibration of the subject 1, which occurs under the action of the Lorentz force caused by the interaction of currentsandincreases with increasing current amplitude. Automatic microwave transceiver 4 using antenna receives reflected from the detection zone of the microwave signal
phase modulated frequency mechanical vibration searching Ω. Output automatic microwave transceiver 4 received microwave signalpostopia is at the first input of phase detector 5, to the second input of which is applied the probing microwave signalfrequency ω=2πf. The phase detector 5 connected to the low pass filter 6, selects from the received microwave signaluseful signal frequency Ω is input to the indicator 7.
Thus, the proposed method and device for its implementation can detect with greater reliability small metal objects carried through the detection zone than in the known method.
1. The method of detection of small metal objects, based on excitation of the detection area of the low-frequency electromagnetic field and receive reflected from the detection zone signal, characterized in that additionally the detection zone is irradiated with the microwave field, select the amount of low-frequency electromagnetic field sufficient for the occurrence of mechanical vibration subject search in the detection zone, shall receive reflected from the detection zone of the microwave signal, modulated by the mechanical vibration of the object of the search, extracted from the received modulated microwave signal, the useful signal frequency Ω, where Ω is the frequency of mechanical vibration of the object of the search.
2. Device for the detection of small metal objects that contain low-frequency generator connected to the induction and what suchtelen, characterized in that it further comprises automatic UHF transceiver with an antenna, the first and second outputs of which are connected to first and second inputs of the phase detector, respectively, and the output of the phase detector through a low pass filter connected to the detection indicator.
SUBSTANCE: pulsed electromagnetic field is excited on the profile under analysis. The overall transient intensity characteristic of the complete electromagnetic field (EMF) is measured in the intervals between pulses of the excitation current. Presence of a hydrocarbon deposit is determined based on comparing the value of the polarisation induced component of the electromagnetic field intensity measured during the intervals between current pulses, with a theoretically calculated value. Further, the value electromagnetic field intensity component arising from the induced polarisation process on a given interval of the linear profile and the background induced polarisation value are measured. The type of hydrocarbon is determined from high or low anomalous of measured induced polarisation parametres relative the background.
EFFECT: more reliable detection hydrocarbon deposits and information content of searching with unambiguous identification the type of hydrocarbons.
SUBSTANCE: magnitude of magnetic field induction vector of the Earth (MFIVE) is synchronously measured using two scalar magnetometres placed on separate gondolas. The gradient of the magnitude of the magnetic field induction vector of the Earth is determined and then integrated on the traversed path. The integration results undergo low-pass filtration. The magnitude of the magnetic field induction vector of the Earth is further measured using two extra scalar magnetometres placed on separate gondolas, towed behind the vessel such that the system of four magnetometres is not in the same plane. Coordinates of the magnetometres are synchronously measured with the magnitude of the magnetic field induction vector of the Earth. During combined processing of the magnetometric data and coordinates of the magnetometres, triorthogonal components of the gradient of the magnitude of the magnetic field induction vector of the Earth are determined, as well as increase in magnitude of the magnetic field induction vector of the Earth relative the initial measurement point.
EFFECT: obtaining more accurate results.
FIELD: measurement equipment.
SUBSTANCE: invention is related to electric survey by method of electric resistance for detection of landslip processes development sections and monitoring of filled structures. Measurements are carried out by method of vertical electric probing along bed, slope and near foot on one and another side of embankment. Capacity and specific resistance of fill material layers are identified. Longitudinal conductivity is calculated to detect sections of drowned clay material. Detected sections are used to arrange transverse geoelectric cuts. Measured relative longitudinal conductivity is detected together with slipping surface of drowned clay material. Water samples are taken on detected drowned sections, water specific electric resistance is measured to identify water mineralisation and identify relative longitudinal conductivity of clay in case of its full saturation. Comparison of measured relative longitudinal conductivity of clay to relative longitudinal conductivity in case of its full saturation helps to identify maximum possible condition for landsliding. In order to investigate dynamics of landslip processes, observations are performed in base stations located in detected drowned areas.
EFFECT: improved efficiency of detection and prediction of sections, which are hazardous from the point of view of landsliding.
3 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry, particularly to hydraulic break of underground reservoirs required, for example for stimulation of oil or gas inflow into well. The method consists in the below described operations: a particle-target and/or propping agent are introduced into a rupture; further, electromagnetic radiation of from approximately 300 MHz to approximately 100 MHz frequency is emitted into the rupture; a reflected signal from the particle-target is analysed for estimation of rupture geometry. Here is also disclosed the method of estimation of underground rupture geometry including operations, where: the target and/or propping agent are introduced into the rupture; also the particle-target and/or propping agent contain high dielectric ceramic with dielectric constant more or equal approximately to 2; electromagnetic radiation of frequency less or equal to approximately 3 GHz is emitted into the rupture; signal reflected from the particle-target and/or propping agent is analysed for estimation of rupture geometry.
EFFECT: ensuring increased reliability and safety of estimation of rupture geometry of hydraulic break, decreased expenditures for this operation.
27 cl, 1 tbl
FIELD: physics; geophysics.
SUBSTANCE: group of inventions (versions) relates to exploration geophysics, in particular to the systems of equipment for conducting sea geoelectrical exploration and is meant for predicting accumulation of hydrocarbons and other minerals, as well as for studying deep structure of the earth's crust. Proposed is a modular bottom station based on combining a basic module for measuring electromagnetic characteristics of sea bottom rocks with additional modules containing equipment for measuring other parametres of the rocks. The additional modules are fitted by the basic module and a weight. All the recording and power supply systems are accommodated in the basic module and are connected to the other modules via pressure-sealed connectors in the housing of the module, and the modules themselves are fixed on the weight using Kevlar sheets which are fitted with an electrochemical releasing element. The additional modules of the bottom station are modules for magnetic and/or seismic measurements. "Rods" can be fastened at the lower part of the housing of the station and in the initial state they are directed upwards at an angle not less than 15° from the vertical and are held using retainers, which are joined to the releasing element of a hoisting device (HD). The "rods" can be telescopic. In another version of the proposed bottom station, the basic module can be used independently. In that case, a hard conical element "basin", made non-conducting material for example polyethylene, polyurethane etc can be placed between the module and the weight. The basic module can also be connected on a semi-rigid rod to a module for magnetic measurements.
EFFECT: measuring different parametres of sea bottom rocks in a single launch, provision for sensitivity of detectors, which exceeds that of stations with such single type measuring devices, compactness and convenient use.
8 cl, 4 dwg
FIELD: instrument making.
SUBSTANCE: invention relates geophysics, particularly, to electromagnetic LF devices intended for analysing GST. Proposed device comprises two antennas arranged orthogonally and connected to receiver, one of them being installed vertically. Proposed device comprises additionally data processing device and third antenna arranged orthogonally to aforesaid two antennas and connected to aforesaid receiver. The later incorporates transmitter with its output connected to the data processing device input. Transmitter allows transmitting signals comprising data on mutually-orthogonal components Hx, Hy, Hz of natural pulsed electromagnetic Earth field to data processing device the later allows computation of Wzx (x, y)=Hz/Hx and Wzy (x, y)=Hz/Hy, determination of relationship Wzx=F(Δf) and Wzy=F(Δf), where "ДГ" is the range of received frequencies of mutually-orthogonal components Hx, Hy, Hz, from f0 to f and integration of aforesaid relationships Wzx and Wzy.
EFFECT: expanded performances, higher accuracy.
9 cl, 5 dwg
FIELD: physics, measurements.
SUBSTANCE: invention relates to exploration geophysics. In compliance with this invention, bottom stations are installed on sea bottom along the line, i.e. profile, covering the area to be explored to form the observation profile (OP), the said station are spaced 1000 m apart. A ship incorporating a generating dipole is directed through the centre of one of electrode separations, close to the centre of explored area area, perpendicular to OP, to form an excitation profile (EP). The electric field magnitudes picked off the bottom station receiving electrodes are referenced to the centre of distance between the appropriate separations of aforesaid bottom station to form an area system of measurement profiles (MO). A one-dimensional inversion is performed for every MO. Proceeding from the data obtained, a 3D geoelectric model of the medium is constructed in units of specific resistance, or specific resistance and parametres of polarisability. Now, proceeding from their abnormalities it is possible to judge upon the presence of a deposit, its position in plan and depth. The ship can carry out researches both with horizontal generating dipole towed on sea surface, and with vertical or horizontal dipole towed on over sea bottom.
EFFECT: reliable forecasting at depths from 0 to 2000 m and deeper.
9 cl, 2 dwg
FIELD: physics; measurements.
SUBSTANCE: present invention pertains to geophysical methods of prospecting. An electromagnetic field is generated through generation of a pseudorandom bipolar sequence of packets of periodical current pulses in a transmitter coil. The value of the cross-correlation function is calculated for components (time derivative) of magnetic or electric field and the current form, either with zero-time shift ΔT between time-sequences of the cross-correlation function or without it. From the values of the cross-correlation function with increment, equal to the period of the current pulses, the impulse reaction of the geoelectric medium is determined, which in turn is used to determine the structure of the geoelectric medium. From the difference of impulse reactions on the background and in the absence of primary magnetic field, objects are identified depending on their induced magnetisation. The generator of electromagnetic field has a dc current source, a rectifier bridge, controlled generator of pseudorandom sequences of time intervals, synchronised by a stabilised clock-pulse generator, and a transmitter coil connected to a current sensor. Between the DC current source and the transmitter coil, a current switch is connected, synchronised by a stabilised clock-pulse generator. The generator of pseudorandom sequences of time intervals is connected to the stabilised clock-pulse generator through a frequency divider. In the second version, the transmitter coil generates recurrent packets of current pulses, uniformly distributed according to a random law on the time interval occupied by the packet. In the second version of the device, the current switch is connected to the generator of recurrent packets, randomly and uniformly distributed during pulses, which in turn is connected to the stabilised clock-pulse generator through a frequency divider.
EFFECT: increased accuracy of data from electrical prospecting and reduced labour input.
15 cl, 5 dwg
FIELD: physics; measurements.
SUBSTANCE: present invention pertains to electrical prospecting using an electrical resistance technique. The invention can be used chiefly, for detecting tectonically crushed, water permeable rocks, detection of ore-bearing objects, covered by loose formations, studying the spread of industrially contaminated underground water in the geological environment etc. One supply ground connection is put at infinity. In a well, several supply ground connections are arranged at a given distance from each other. These connections are successively connected to a current source. For each connection, the potential drop between receiving ground connections are measured using a measurement grid. The apparent electrical resistance values are determined from the potential drop values. Isolines for electrical resistance for all depths where the supply ground connections are drawn up. Presence and position of geoelectric irregularities is determined from the layout of the isolines. Within the boundaries of the detected irregular regions, one of the receiving ground connections is moved around the other. The potential drop between them is measured. In the direction of the receiving line, at maximum voltage value, the spread of linear-stretched irregularities or the position of local objects with increased electroconductivity can be determined.
EFFECT: increased efficiency of detecting irregularities in the geological environment.
2 cl, 2 dwg
SUBSTANCE: method for determination of pneumatic puncher deviation angle from prescribed trajectory includes creation with the help of transmitter and transmitting antenna the electromagnetic field oriented along direction of pneumatic puncher movement. At the output of receive antennas signals are extracted which are proportional to electromagnetic field component strength and which are separated using decoupler and alternatively supplied to receiver input where they are detected and amplified. According to difference of these signals the pneumatic puncher deviation angle from prescribed trajectory is evaluated. As transmitting antenna a nonsymmetric dipole is used where pneumatic puncher is long arm and conducting material disk is short arm which disk is connected to it via dielectric disk. Electromagnetic field directional pattern is created in the form of cone in microwave frequency band against electric component. Deviation angle is evaluated according to difference of signal amplitudes at output of comparing device connected by its input to receiver output and by its output - to indicator.
EFFECT: enhancement of efficiency due to increase in accuracy, range capability and interference resistance relative to external natural and artificial noise.
2 cl, 2 dwg
FIELD: measuring equipment, applicable in agricultural equipment.
SUBSTANCE: the inductance transducer during operation generates interferences which being amplified by an amplifier-filter may cause actuation of the flip-flop and actuator. The maximum interference signal is produced at the instant of passage of the harvester roll weld above the inductance transducer. At this moment the position pickup generates a compensating signal, which is subtracted in the amplifier from the signal of the inductance transducer. Thus, the signal used for comparison with the set point does not contain interferences.
EFFECT: simplified adjustment of the system, enhanced sensitivity, noise immunity.
7 cl, 6 dwg
FIELD: geophysics, in particular, paleomagnetism.
SUBSTANCE: the position of the interfaces formed by inversions of the geomagnetic field is determined by pulse radar detection and ranging of the magnetic field with the aid of radar units with a power potential of 500 to 600 dB. The radiating and receiving devices of the radar units include horizontal magnetic dipoles. The interfaces are separated by comparison of the data of pulse radar detection and ranging of the magnetic field and pulse radar detection and ranging of the electric field.
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.
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.
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.
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.
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.
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.
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.