Earth crust electromagnetic sounding system

FIELD: physics.

SUBSTANCE: system includes recorder containing multichannel module of analog signal reception and transform; each channel of module includes low-pass filter, analog amplifier and analog-to-digital converter. The system also includes data control and processing module containing interconnected numeric processor, data memory and master microcontroller with program memory. The recorder contains AD converters overload detectors designed as timing units included in numerical processor. The recorder also contains built-in screen and keyboard assembly, connected through data exchange bus to master microcontroller with program memory of data control and processing module. Differential operational amplifiers with controlled input are used as analog amplifiers in channels of module of analog signal reception and transform. The recorder contains comprised in numerical processor timing units computing signal invariable component in channels of module of analog signal reception and transform. The recorder input contains units, comprised in numerical processor timing, computing signal invariable component in channels of module of analog signal reception and transform. Input of each specified unit is connected through data exchange bus to master microcontroller with program memory, and output is connected through digital-to-analog converter to driving input of differential operational amplifier mounted in corresponding channel of module of analog signal reception and transform.

EFFECT: improved accuracy and reliability of received data and enhanced ease of use.

5 cl, 1 dwg

 

The invention relates to Geophysics, namely, devices for geophysical exploration by electromagnetic sounding of the earth's crust, in particular, on the basis of measurements of variations in the components of the magnetotelluric field of the Earth.

At present, geophysical study of the earth's crust, including with the purpose of finding oil and gas, are widely used device for electromagnetic soundings. The operation of these devices is based on registration of variations of electric and magnetic components of the electromagnetic field of low frequency band, which depend on the electrical properties of the underlying environment.

Among these devices are very promising devices for magnetotelluric sounding, in which register variations of natural low-frequency electromagnetic field of the Earth (magnetotelluric fields), and therefore in the works this method does not use any additional external sources of electromagnetic fields.

It is known a device for magnetotelluric sounding of the earth's crust [SU 1270733].

Consider the device contains sensors electric and magnetic fields and the Registrar, where the receiving node and the conversion of measured signalov digital form, includes analog-to-digital Converter and the control unit and processing data containing storage and recording devices, as well as a collection of elements that control the operation of said devices comprising a master oscillator, a pulse counter, switches, switching devices, logic circuits And / OR.

On the analog-to-digital Converter alternately the signals from the sensors of electric and magnetic fields. Output the specified Converter codes signals alternately served on the recording device which records on magnetic media. In the recording device also records the ID number of the full frame of information and Board time, which is a room full frame, which increases the reliability of decoding the received information.

The development of microprocessor technology have led to the emergence of a new generation of devices for electromagnetic sounding of the earth's crust, which are based digital recorder that provides digitization and digital processing of the signals from the sensors of the electromagnetic field, as well as the storage of a significant amount of received information in digital form in the memory.

Thus, in particular, is known for magnetotelluric system [US 6191587], which content is t multiple sensors of the electric field, at least one magnetic field sensor and the number of registrars, the input of which receives signals from sensors of the electric field and/or magnetic fields. Registrars to carry out processing of the digitized input signals using a microprocessor and stores the received data in the internal memory. While registrars have channels of communication with the personal computer of Notebook type on the screen which can display the received data and the channel of communication with the navigation system of GPS positioning to determine the coordinates and time, and synchronization of the operation of the equipment.

As the closest analogue of the authors of the selected device for electromagnetic sounding of the earth's crust [EN 95121907].

Consider the device includes sensors designed to measure the component of the electromagnetic field, the microprocessor Registrar, and also connected to a personal computer of Notebook type on the screen which can display logged data.

The main nodes of the Registrar can be grouped into two functional modules: multi-channel module receiving and converting analog signals and the control module and data processing.

Multi-channel module receiving and converting analog signals contains four channels, each of Kotor is x connected to the output of one of the sensors of electric and magnetic fields and includes the filter of low frequencies, analog amplifier and analog-to-digital Converter. The control module and the data it contains are related to each other mathematical processor which carries out arithmetic processing of the digitized signals, a data memory and a control microcontroller program memory.

In addition, the Registrar has four devices detect overloads analog-to-digital converters, allowing to determine the presence in the measured signal pulses with amplitude exceeding permissible for analog-to-digital Converter level. In those devices used four neon indicator lamps, each of which is respectively connected to the output of one of the analog-to-digital converters. The inclusion of these lamps indicates the presence in the measured signal of these powerful impulses. The output of each lamp is connected with the control module and data processing, while the identification of powerful pulse signal processing mathematical processor terminated within a specified time delay.

The Registrar also contains a host of visual control of the level of the measured signal, comprising four peak detector and two switches of the device.

Considering the device is not convenient to use because it does not contain built-in VI is whlesale collected by the data logger, and this visualization is performed when connecting to the Registrar an additional computer "Notebook". At the same time to monitor the level of the signal applied analog devices that cannot provide high accuracy of visual inspection.

The use of neon lights in the structure of the devices detect overloads analog-to-digital converters provide high efficiency and reliability of detection of powerful impulses that can degrade the accuracy of the data.

In this device does not provide the analysis and compensation of the DC component (DC voltage) of the input signals from the sensors of electric and magnetic fields, which reduces the allowable range of the amplified analog signal amplifier and may cause distortion of the received data. In addition, the lack of analysis of the constant component of the signal and subsequent compensation does not allow using the device in question without additional special frequency filter to process the signals, in which there is practically only the DC component, that is, signals that are close to DC. This also leads to decrease in the reliability of the obtained data.

The task of the claimed what about the invention is to improve the accuracy and reliability of the obtained data, as well as improving ease of use.

The invention consists in that the device for electromagnetic sounding of the earth's crust, including the Registrar, containing a multi-line module receiving and converting analog signals, each channel includes a low pass filter, an analog amplifier and an analog-to-digital Converter and the input of each channel which is intended for connection of the recorder with one of the sensor components of the magnetic and electric fields, the control module and data containing related mathematical processor, the data memory and the control microcontroller program memory, the Registrar contains the device identification overload analog-to-digital converters, input each of which is associated with the output of the corresponding analog-to-digital Converter, and the output connected with the control module and data processing, according to the invention, the recorder further comprises a host of built-in screen and keyboard, connected by bus to exchange information with the host microcontroller program memory control module and data logger as devices detect overloads analog-to-digital Converter used software device included in the comp is in a mathematical processor, the output of each of which is connected by a bus to exchange information with the memory and data with the host microcontroller program memory, in the Registrar as analog amplifiers in the channels of the module receiving and converting analog signals used differential operational amplifiers with controlled entrance, if this logger has included mathematical processor software device calculating the DC component of the signal channels of the module receiving and converting analog signals input to each of the devices connected by the bus exchange information with the host microcontroller program memory, and the output of each of these devices is connected through a d / a Converter with a control input of the differential operational amplifier that is located in the corresponding channel module receiving and converting analog signals.

In the particular case of carrying out the inventive device further comprises a remote preamplifier, the inputs of which are connected to the outputs of the sensors component of the electric field, and outputs connected to inputs of channels of the module receiving and converting analog signals intended for connection logger with sensors component of the specified field.

In the particular case of execution included with the composition stated the tion of the device, the recorder further comprises turning on the filters frequency, each of which is mounted in the channel of the module receiving and converting analog signals after the differential operational amplifier and before the analog-digital Converter.

In the particular case of execution included with the composition of the claimed device, the recorder further comprises associated with the module receiving and converting analog signals module positioning and verification time, with the specified module includes connected to each other node in communication with a navigation and positioning system and the node clock generator, the output of which is connected to the clock inputs of analog-to-digital converters.

In particular, if you run the inbound part of the Registrar to the control module and processing the data further comprises the standard channel of communication with personal computers.

The presence of the Registrar, a part of the inventive device enables microprocessor processing from sensors magnetic and electric fields of the signal, as well as collecting and storing in memory the Registrar received electromagnetic sounding data.

Multi-channel module receiving and converting analog signals, number of channels, which corresponds to the number of measured component of the electromagnetic field, provides in each channel filtering in the one analog signal bandwidth signals, lying in the investigated low frequency range gain of the analog signal and converting it into digital form.

Module control and data registers in digital form the information collected from the outputs of the multichannel module receiving and converting analog signals, mathematical processing said information, including implements mathematical processor amplitude and phase measurements of the component of the electric and magnetic fields, and also provides storage of information in data memory, in particular, in non-volatile Flash memory.

The proposed device has a number of significant design features.

The presence of the Registrar of the host built-in screen and keyboard associated bus exchange information with the host microcontroller program memory control module and data processing, provides the convenience of Autonomous control using the keypad nodes and elements that are part of the claimed device and the visualization on the integrated screen Registrar of the measured signals and the received data.

Use the recorder as a device detecting overloads analog-to-digital Converter is included in the mathematical processor and operating in continuous mode the software device is ist, the input of each of which is associated with the output of the corresponding analog-to-digital Converter, and the output is connected by bus to exchange information with the memory and data with the host microcontroller program memory, increase the efficiency and accuracy of detection of high-power pulsed interference signals, which increases the measurement accuracy of the investigated parameters and reliability of the obtained data,

Use the recorder as an analog differential amplifiers operational amplifiers with controlled entrance, as well as the presence of the Registrar included in the mathematical processor software devices calculate the DC component of the signal channels of the module receiving and converting analog signals, the input of each of which is connected by a bus to exchange information with the host microcontroller program memory, and the output is connected through a d / a Converter with a control input of the corresponding differential operational amplifier, allow us to determine the magnitude of the DC component of the measured signals and enable her compensation. This capability extends the range of the measured signals, and also makes it extra special frequency filters to process the signals lying in the range of low hour is from, close to DC, which also improves reliability of the obtained data.

Thus, the inventive device provides improved precision and reliability of the obtained data, as well as increased ease of use.

When the inventive device further comprises a remote preamplifier, which can be removed to a considerable distance from the Registrar, provided a more accurate measurement of the components of the electric field due to the exclusion of the influence of local interference in the area of location of the Registrar, which is especially important when monitoring works.

In the case of the Registrar include industrial filters frequencies, each of which is mounted in the channel of the module receiving and converting analog signals after the differential operational amplifier and before the analog-digital Converter, improved measurement accuracy by eliminating the influence on the results received signals from the interference frequency.

When the recorder further comprises associated with the module receiving and converting analog signals module positioning and verification time, with the specified module includes connected to each other node in communication with a navigation and positioning system and the bonds of the l clock generator, the output of which is connected to the clock inputs of analog-to-digital converters, it is possible to determine by means of the above positioning system, in particular, the navigation system GPS positioning coordinates of observation points and the exact time of the measurement component of the electromagnetic field, as well as the synchronization of all elements and nodes of the Registrar and if the Registrar is network Registrar sync all registrars are part of the network.

When the control module and data logger further comprises a standard channel of communication with personal computers, it is possible to use a special program to control the operation of the recorder using a personal computer, and also to render the received information on her screen.

The drawing shows a functional diagram of the inventive device.

The device includes a Registrar, including four-channel module 1 receive and convert analog signals, inputs 2 and 3 of the two channels which are designed to connect the recorder with the components of magnetic field sensors, and inputs 4 and 5 of the other two channels which are designed to connect the logger with sensors components of the electric field.

Each channel of the module 1 includes a filter nizkoe frequency, analog amplifier 7, which used differential operational amplifier with a controlled input, and analog-to-digital Converter 8. In addition, each channel is placed in the included operator filter 9 industrial frequency.

The Registrar also contains the node 10 built-in screen and keyboard module 11 control and data processing, which includes related to each other tires of the exchange of mathematical information processor 12, memory 13 data and managing the microcontroller 14 program memory 15. The node 10 is connected by bus to exchange information with the host microcontroller 14 program memory 15 module 11.

In the structure of the mathematical processor 12 includes a software device 16 detect overloads analog-to-digital converters, the input of each of which is associated with the output of the corresponding analog-to-digital Converter 8, and the output of the associated tires of sharing information memory 13 and data with the host microcontroller 14, memory 15 programs.

In the structure of the mathematical processor 12 also includes a software operator device 17 calculate the DC component of the signal channels of the module 1. The input of each device 17 is connected by bus to exchange information with the host microcontroller 14, memory 15, while the output of each of the devices connected che is ez digital to analog Converter 18 with the control input of the differential operational amplifier 7, located in a corresponding channel of module 1.

The module 11 includes a communication with a personal computer including a control unit 19, in particular the Ethernet controller connected to a standard communication channel 20, in particular to the Ethernet cable.

In addition, the Registrar has associated with module 1 module 21 positioning and verification time, which includes connected to each other node 22 connection with a navigation positioning system, in particular with receiver GPS satellite navigation system, and the node 23 of the clock generator providing clocking all nodes and elements of the Registrar. The output node 23 is connected to the clock inputs of analog-to-digital converters 8.

The inventive device also includes a remote preamplifier 24, the inputs of which are connected to the outputs of the sensors of the components of the electric field, and outputs connected to inputs of channels 4 and 5 of the module 1.

The device operates as follows.

The inputs 2 and 3 of module 1 of the Registrar receives the output signal of the sensor components of the magnetic field, and the inputs 4 and 5 of the module 1 receives signals from the output of the preamplifier 24 to the input of which receives the output signal of the sensor components of the electric field. Each module channel 1 input signal after passing through the low pass filter 6 is amplified by the amplifier 7 and PR is produced in digital form in analog-to-digital Converter 8. In the presence of near point observation of industrial noise is additional filtering of the measured signals using a filter 9, which includes, in particular, by setting the operator corresponding mode using the keyboard.

With the output of each Converter 8 digitized signals are fed into the module 11, where they arrive at the input of the corresponding software device 16 in the structure of the mathematical processor 12. Devices 16 analyzes collected with the sampling rate of the input signals, with detection of high-power pulsed interference signals whose values fall outside these limits, in particular, for the operating range of the transducers 8 and programmatic rejection of these interference signals. Rejection is done by marking signal interference special code. Data received from the output device 16 is stored in the memory 13 data and processed in a mathematical processor 12, where the calculated amplitude and phase characteristics of the component of the electromagnetic field. The data obtained and measured parameters are displayed on the built-in screen recorder. Powerful pulsed interference signals marked with a special code, the program recognizes the interpretation of existing data in the memory 15 programs are taken out of the processing and is not visualized on the screen of the recorder.

When in the measured signals revealed the presence of a permanent component, its value is calculated in the mathematical processor 12. In the presence of DC component included device 17 and will be compensated DC component of the signal. This compensation is carried out by feeding to the control input of the corresponding amplifier 7 signal output corresponding device 18, equal in amplitude and opposite in sign to a certain constant component of the signal. The compensation signal is converted to analog form by Converter 18.

Module 21 is carried out to determine coordinates of observation points and time on the signals from the navigation system positioning. In addition, the synchronization mode time (the Registrar, which will be periodically adjusting the frequency of the oscillator using the node clock generator 23 of a hardware-based mechanism.

1. Device for electromagnetic sounding of the earth's crust, including the Registrar, containing a multi-line module receiving and converting analog signals, each channel includes a low pass filter, an analog amplifier and an analog-to-digital convert the user, and the entrance of each channel which is intended for connection of the recorder with one of the sensor components of the magnetic and electric fields, the control module and data containing related mathematical processor, the data memory and the control microcontroller program memory, the Registrar contains the device identification overload analog-to-digital converters, the input of each of which is associated with the output of the corresponding analog-to-digital Converter, and the output connected with the control module and processing data, wherein the recorder further comprises a host of built-in screen and keyboard, connected by bus to exchange information with the host microcontroller memory software control module and data logger as devices detect overloads analog-to-digital Converter used software device included in the mathematical processor, the output of each of which is connected by a bus to exchange information with the memory and data with the host microcontroller program memory, in the Registrar as analog amplifiers in the channels of the module receiving and converting analog signals used differential operational amplifiers with controlled entrance, the Registrar function is included in the mathematical processor software device calculating the DC component of the signal channels of the module receiving and converting analog signals, the input of each of these devices is connected by bus to exchange information with the host microcontroller program memory, and the output of each of these devices is connected through a d / a Converter with a control input of the differential operational amplifier that is located in the corresponding channel of the module receiving and converting analog signals.

2. The device according to claim 1, characterized in that it further comprises a remote preamplifier, the inputs of which are connected to the outputs of the sensors component of the electric field, and outputs connected to inputs of channels of the module receiving and converting analog signals intended for connection logger with sensors component of the specified field.

3. The device according to claim 1, wherein the recorder further comprises turning on the filters frequency, each of which is mounted in the channel of the module receiving and converting analog signals after remote preamplifier differential operational amplifier and before the analog-digital Converter.

4. The device according to claim 1, wherein the recorder further comprises associated with the module receiving and converting analog signals module positioning and verification time, with the specified module includes United with each other, userspace with navigation positioning system and the node clock generator, the output of which is connected to the clock inputs of analog-to-digital converters.

5. The device according to claim 1, characterized in that the Registrar the control module and processing the data further comprises the standard channel of communication with personal computers.



 

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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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