CN105676295A - SQUID-based magnetic source induced polarization-induction combined detection system and method - Google Patents
SQUID-based magnetic source induced polarization-induction combined detection system and method Download PDFInfo
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- CN105676295A CN105676295A CN201610065615.1A CN201610065615A CN105676295A CN 105676295 A CN105676295 A CN 105676295A CN 201610065615 A CN201610065615 A CN 201610065615A CN 105676295 A CN105676295 A CN 105676295A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
Abstract
The invention discloses an SQUID-based magnetic source induced polarization-induction combined detection system and method. The system comprises an emission unit and a reception unit. The emission unit is formed by a high-power transmitter, a non-inductive resistor, a current acquisition card and an emission loop, wherein the high-power transmitter and the non-inductive resistor are connected in series with the emission loop; the high-power transmitter, the non-inductive resistor and the emission loop form a closed loop; and the current acquisition card is connected in parallel at the two ends of the non-inductive resistor, and is used for collecting emission current in the emission loop. The reception unit is formed by a low-temperature SQUID sensor and a receiver. The method comprises the following steps: 1) paving the emission loop; 2) connecting the non-inductive resistor in series in the emission loop; 3) carrying out emission unit and reception unit synchronous transmission; 4) removing a primary field; and 5) carrying out resistivity-depth imaging. The beneficial effects are that the system meets the characteristics of fast signal attenuation and large bandwidth in the early stage, and also meets the characteristic of large efficient signal dynamic range (>140 dB).
Description
Technical field
The present invention relates to a kind of combined detection System and method for, particularly a kind of magnetic source induced polarization based on SQUID-The combined detection System and method for of induction.
Background technology
Current, traditional transient electromagnetic system adopts coil or bar magnet as receiving sensor, is mainly used in non-polarizableThe earth. At polarizable the earth, due to the impact of polarity effect, attenuation curve is decay rapidly in early days generally, and enter into negative mid-termValue, and again occur late on the occasion of, traditional transient electromagnetic detecting system generally adopts the magnetic sensing of coil or smaller bandwidthDevice (bar magnet) receives, and because coil exists transient process in early days, does not detect again faint deamplification late period, cannot contain polarizationThe earth of medium is effectively surveyed.
Chinese scholars is set up the polarization in multiple model (Cole-Cole model is typical case the most) research transient electromagnetic signalEffect, analysis has the feature of the Transient electromagnetic response of polarity effect. Herein by calculating containing polarization layer the earth transient electricalMagnetic response feature, transient electromagnetic signal in early days < 20ms affects obviously by polarization response, attenuation curve decays to negative value mid-term,Late period (> 100ms) occur on the occasion of, but signal is generally very little, field decay dynamic range is greater than 140dB, field decay is measured to fTLevel, this is that traditional induction coil or the Magnetic Sensor of smaller bandwidth (bar magnet) and receiver all cannot be measured.
Along with the application of superconducting magnetic sensor in transient electromagnetic, for carrying out great deep exploration, conventionally sending out by narrow pulsewidthPenetrate, the long-time mode receiving, due at non-polarizable the earth, transient electromagnetic signal is decayed gradually, and rising edge producesThe secondary field impact that secondary field produces trailing edge is very little, can ignore, and this transmitted waveform is applicable to non-polarizable the earthSurvey, in the time that search coverage contains polarizable, owing to affected by polarization, the signal in late period may be greater than the signal in mid-term,Only select high-power transmitter to realize wide pulse width transmitting (transmitting pulsewidth > 100ms), just can reduce the secondary field that rising edge producesThe impact of the secondary field that trailing edge is produced.
CN201410746339.6 discloses transient electromagnetic B field descends the method for geological information definitely, is survey based on coilAmount dB/dt becomes B field through integration, and prove that the detection of B field has advantages of resistivity monambiguity, but adopted coil to measure,Still cannot effectively survey in actual applications.
2011, the AChwala of German Jena first by low-temperature superconducting sensor application in great Ding Yuan TEM, attenuation curveCan measure 200ms, not consider effectively to reject the method for primary field, meanwhile, also have no it and be reported under polarization geological conditionsDetection application.
2015, DavidMarchant studied in magnetic source polarization response to Transient electromagnetic response in thesis for the doctorateImpact, and the magnetic polarization parameter extracting method of frequency domain magnetic source has been proposed, theory has been calculated the transient electromagnetic of polarizable the earthLate period weak output signal, and to have mentioned low temperature SQUID may be effective sensor, but do not provide effective instrument system.
Summary of the invention
The object of the invention is to carry in the deficiency containing under the detection of polarization the earth in order to solve existing transient electromagnetic systemThe combined detection System and method for of a kind of magnetic source induced polarization-induction based on SQUID of confession.
The combined detection system of the magnetic source induced polarization-induction based on SQUID provided by the invention includes transmitter unitAnd receiving element, wherein transmitter unit is made up of high-power transmitter, noninductive resistance, current acquisition card and transmitting loop, whereinHigh-power transmitter and noninductive resistance and transmitting loop are connected in series, and high-power transmitter, noninductive resistance and transmitting loop formClosed-loop path, current acquisition card is connected in parallel on noninductive resistance two ends, for gathering the emission current of transmitting loop, receiving element byLow temperature SQUID sensor and receiver composition, wherein low temperature SQUID sensor is located at the central part in region that transmitting loop enclosesPosition, is connected by differential signal line between low temperature SQUID sensor and receiver, and transmitter unit and receiving element are same by GPSStep is carried out transfer of data.
Receiver by the first buffer, the second buffer, amplifier, low speed analog-digital converter, high-speed AD converter, depositCard storage and main control module composition, wherein the first buffer, high-speed AD converter and storage card are in series, and the second buffer, putLarge device, low speed analog-digital converter and storage card are in series, and SQUID sensor signal is sent at a high speed after the first bufferIn analog-digital converter, SQUID sensor signal is sent to low speed modulus through amplifier again after the second buffer simultaneouslyIn converter, high-speed AD converter and low speed analog-digital converter store the data of collection into storage card by master control module controlsIn.
The combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID provided by the invention, its method is as followsDescribed:
Step 1, laying rectangle transmitting loop, high-power transmitter transmitting bipolar square wave;
Step 2, noninductive resistance is connected in transmitting loop, utilizes current acquisition card to record complete transmitted waveform;
Step 3, low temperature SQUID sensor is placed on to the centre in region that transmitting loop encloses, uses at a high speed simultaneouslyAnalog-digital converter and low speed analog-digital converter gather the vertical component of central magnetic field, and transmitter unit and receiving element adopt GPS sameStep is carried out transfer of data;
Step 4, primary field according to the emission current of record with the husky farr's law computer center's point of Biot, by primary fieldThe field signal receiving from SQUID, weed out;
Step 5, basis are extracted the two ginsengs of polarizability-electrical conductivity containing polarization layer stratiform the earth transient electromagnetic signal temporal signaturesNumber, and carry out resistivity-Depth Imaging.
Emission parameter in step 1 need to change tranmitting frequency according to actual detection, in order to reduce two of rising edge generationInferior the impact on transient electromagnetic signal, adopts high-power transmitter to launch the bipolar square wave of low frequency, dutycycle 50%, transmittingPulsewidth is preferably greater than 100ms, and emission current is generally selected 100A, the general rectangle of selecting 100 meters of the length of sides of transmitting wire frame size.
In step 3, selecting sample rate is 2MSPS and 30KSPS, logical by quick SPI Serial Peripheral Interface (SPI) and main control moduleLetter, 2000 times of fixed gain instrument amplifiers of termination before low speed analog-digital converter, realize collection dynamic range and are greater than 140dB; AdoptCollection data are stored in high speed SD card.
Biot-Sha farr's law the expression formula according to emission current computer center's point magnetic field described in step 4 is:
Wherein H is magnetic field intensity, and I ' dl ' is line element electric current, and R is the position vector of elementary current with respect to central point.
The method of the rejecting primary field described in step 4 is to calculate the collection of current acquisition card according to Biot-Sha farr's lawEmission current I (t) central point produce magnetic field H (t), wherein on-time section central point produce magnetic field H0, low temperatureThe magnetic field H z (t) that SQUID receives at central point, the magnetic field that wherein on-time section receives is Hz0, obtain correction coefficient K=Hz0/H0, can effectively reject the impact of primary field according to correction coefficient, the secondary field obtaining is Hz'(t)=(Hz (t)-H (t) *K)。
Beneficial effect of the present invention:
The present invention compared with prior art, has broken through the restriction of traditional transient electromagnetic system in polarizable the earth application, pinTo the stratiform the earth Transient electromagnetic response feature containing polarization layer, design and Implement high-power transmitter unit, excite 1Hz dutycycle50% bipolarity waveform, has avoided the impact on transient electromagnetic signal of secondary field that rising edge causes, to adopting of emission currentCollect the more effective impact of primary field on transient electromagnetic signal of having rejected, receiving element adopts high-speed AD converter and low simultaneouslySpeed analog-digital converter gathers, both met early signal decay fast, with roomy feature, met again useful signal dynamicThe large (> 140dB of scope) feature.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is receiver structure schematic diagram.
Fig. 3 is detection method flow chart of the present invention.
Fig. 4 is for containing polarization layer stratiform the earth transient electromagnetic signal temporal signatures figure.
Fig. 5 is resistivity-degree of depth schematic diagram.
1, high-power transmitter 2, noninductive resistance 3, current acquisition card 4, transmitting loop 5, low temperature SQUID sensor6, receiver 10, the first buffer 11, the second buffer 12, amplifier 13, low speed analog-digital converter 14, at a high speedAnalog-digital converter 15, storage card 16, main control module.
Detailed description of the invention
Refer to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5:
The combined detection system of the magnetic source induced polarization-induction based on SQUID provided by the invention includes transmitter unitAnd receiving element, wherein transmitter unit is made up of high-power transmitter 1, noninductive resistance 2, current acquisition card 3 and transmitting loop 4,Wherein high-power transmitter 1 and noninductive resistance 2 are connected in series with transmitting loop 4, high-power transmitter 1, noninductive resistance 2 and transmittingLoop line 4 forms closed-loop path, and current acquisition card 3 is connected in parallel on noninductive resistance 2 two ends, for gathering the transmitting electricity of transmitting loop 4Stream, receiving element is made up of low temperature SQUID sensor 5 and receiver 6, and wherein low temperature SQUID sensor 5 is located at transmitting loop 4The centre in the region that encloses, is connected transmitter unit by differential signal line between low temperature SQUID sensor 5 and receiver 6Synchronize and carry out transfer of data by GPS with receiving element.
Receiver 6 is by the first buffer 10, the second buffer 11, amplifier 12, low speed analog-digital converter 13, high speed analog-digital conversionConverter 14, storage card 15 and main control module 16 form, wherein the first buffer 10, high-speed AD converter 14 and storage card 15Be in series, the second buffer 11, amplifier 12, low speed analog-digital converter 13 and storage card 15 are in series, SQUID sensor signalAfter the first buffer 10, be sent in high-speed AD converter 14, SQUID sensor signal is through the second buffering simultaneouslyAfter device 11, be sent in low speed analog-digital converter 13 again high-speed AD converter 14 and low speed analog-to-digital conversion through amplifier 12Device 13 is controlled the data of collection is stored in storage card 15 by main control module 16.
The combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID provided by the invention, its method is as followsDescribed:
Step 1, laying rectangle transmitting loop, high-power transmitter bipolar square wave;
Lay rectangle transmitting loop 4, generally select the square loop line of 100 meters of the length of sides, emission parameter can be according to realityDetection need to change tranmitting frequency, and the impact of secondary field on transient electromagnetic signal producing for reducing rising edge, adopts high-powerEmitter 1 is launched the bipolar square wave of low frequency, dutycycle 50%, and transmitting pulsewidth is preferably greater than 100ms, and emission current is generally selected100A, emitter adopts the GPS method of synchronization.
Step 2, noninductive resistance 2 is connected in transmitting loop 4, utilizes current acquisition card 3 to record complete transmitted waveShape; Noninductive resistance 2 resistances are general selects 0.001 ohm, utilizes current acquisition card 3 to record complete transmitted waveform, adopts equallyThe GPS method of synchronization.
Step 3, low temperature SQUID sensor 5 are placed on the centre in transmitting loop 4 region that encloses, simultaneously with samplingRate is the low speed analog-digital converter 13 of 2MSPS and 30KSPS, the vertical component that high-speed AD converter 14 gathers central magnetic field, adoptsCollection unit adopts GPS to synchronize with receiving element; Communicate by letter with main control module 16 by quick SPI interface, low speed analog-digital converter 13Front end generally connects 2000 times of fixed gain instrument amplifiers 12, realizes collection dynamic range and is greater than 140dB; Acquired data storage existsIn high speed SD card, synchronize with emitter by GPS.
Step 4, primary field according to the emission current of record with the husky farr's law computer center's point of Biot, by primary fieldThe field signal receiving from SQUID, weed out;
Primary field H (t) according to the emission current I (t) recording in step 1 with the husky farr's law computer center's point of Biot,Biot-Sha farr's law expression formula is:
Wherein H is magnetic field intensity, and I ' dl ' is line element electric current, and R is the position vector of elementary current with respect to central point.
The magnetic field H that wherein on-time section produces at central point0, the magnetic that in step 3, low temperature SQUID receives at central pointField Hz (t), the magnetic field that wherein on-time section receives is Hz0, obtain correction coefficient K=Hz0/H0, can have according to correction coefficientEffect is rejected the impact of primary field, and the secondary field obtaining is Hz'(t)=(Hz (t)-H (t) * K).
Step 5, basis are extracted the two ginsengs of polarizability-electrical conductivity containing polarization layer stratiform the earth transient electromagnetic signal temporal signaturesNumber, and carry out resistivity-Depth Imaging.
In step 5 as shown in Figure 4 containing polarization layer stratiform the earth transient electromagnetic signal temporal signatures, in measured dataEarly stage and extract resistivity late period, extract polarizability mid-term, finally carry out resistivity-Depth Imaging.
Fig. 5 is resistivity-degree of depth schematic diagram, and experimental result and drilling data coincide, and has fully verified of the present invention effectiveProperty, for transient electromagnetic carries out effectively surveying at polarizable the earth new thinking and the method that provide.
Claims (7)
1. a combined detection system for the induced polarization-induction of the magnetic source based on SQUID, is characterized in that: include transmitting singleUnit and receiving element, wherein transmitter unit is made up of high-power transmitter, noninductive resistance, current acquisition card and transmitting loop, itsMiddle high-power transmitter and noninductive resistance and transmitting loop are connected in series, high-power transmitter, noninductive resistance and transmitting loop shapeBecome closed-loop path, current acquisition card is connected in parallel on noninductive resistance two ends, for gathering the emission current of transmitting loop, receiving elementBe made up of low temperature SQUID sensor and receiver, wherein low temperature SQUID sensor is located at the center in region that transmitting loop enclosesPosition, is connected by differential signal line between low temperature SQUID sensor and receiver, and transmitter unit and receiving element pass through GPSSynchronously carry out transfer of data.
2. the combined detection system of the magnetic source induced polarization-induction based on SQUID according to claim 1, its feature existsIn: described receiver by the first buffer, the second buffer, amplifier, low speed analog-digital converter, high-speed AD converter,Storage card and main control module composition, wherein the first buffer, high-speed AD converter and storage card are in series, the second buffer,Amplifier, low speed analog-digital converter and storage card are in series, and SQUID sensor signal is sent to height after the first bufferIn speed analog-digital converter, SQUID sensor signal is sent to low speed mould through amplifier again after the second buffer simultaneouslyIn number converter, high-speed AD converter and low speed analog-digital converter store the data of collection into storage by master control module controlsIn card.
3. a combined detecting method for the induced polarization-induction of the magnetic source based on low temperature SQUID, is characterized in that: its method asDescribed in lower:
Step 1, laying rectangle transmitting loop, high-power transmitter transmitting bipolar square wave;
Step 2, noninductive resistance is connected in transmitting loop, utilizes current acquisition card to record complete transmitted waveform;
Step 3, low temperature SQUID sensor is placed on to the centre in region that transmitting loop encloses, uses high speed analog-digital conversion simultaneouslyConverter and low speed analog-digital converter gather the vertical component of central magnetic field, and transmitter unit and receiving element adopt the same stepping of GPSRow transfer of data;
Step 4, primary field according to the emission current of record with the husky farr's law computer center's point of Biot, by primary field fromIn the field signal that SQUID receives, weed out;
Step 5, two-parameter according to extracting polarizability-electrical conductivity containing polarization layer stratiform the earth transient electromagnetic signal temporal signatures, andCarry out resistivity-Depth Imaging.
4. the combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID according to claim 3, its spyLevy and be: the emission parameter in described step 1 need to change tranmitting frequency according to actual detection, adopt high-power transmitterThe bipolar square wave of transmitting low frequency, dutycycle 50%, transmitting pulsewidth is preferably greater than 100ms, and emission current is generally selected 100A, sends outRay frame size is selected the rectangle of 100 meters of the length of sides.
5. the combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID according to claim 3, its spyLevy and be: in described step 3, selecting sample rate is 2MSPS and 30KSPS, by quick SPI Serial Peripheral Interface (SPI) and master controlModule communication, 2000 times of fixed gain instrument amplifiers of termination before low speed analog-digital converter, realize collection dynamic range and are greater than140dB; Acquired data storage is in high speed SD card.
6. the combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID according to claim 3, its spyLevy and be: described in described step 4 according to Biot-Sha farr's law expression formula in emission current computer center's point magnetic fieldFor:
Wherein H is magnetic field intensity, and I ' dl ' is line element electric current, and R is the position vector of elementary current with respect to central point.
7. the combined detecting method of the magnetic source induced polarization-induction based on low temperature SQUID according to claim 3, its spyLevy and be: the method for the rejecting primary field described in described step 4 is to calculate current acquisition according to Biot-Sha farr's lawThe magnetic field H (t) that the emission current I (t) that card gathers produces at central point, the magnetic field H that wherein on-time section produces at central point0，The magnetic field H z (t) that low temperature SQUID receives at central point, the magnetic field that wherein on-time section receives is Hz0, obtain correction coefficient K＝Hz0/H0, can effectively reject the impact of primary field according to correction coefficient, the secondary field obtaining is Hz'(t)=(Hz (t)-H(t)*K)。
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| CN106873044A (en) * | 2017-04-19 | 2017-06-20 | 吉林大学 | Array SQUID nuclear magnetic resonance underground water detecting devices and imaging method |
| CN107024722A (en) * | 2017-04-19 | 2017-08-08 | 吉林大学 | A kind of low-temperature superconducting magnetic source transient electromagnetic landform correcting method of lane based on abnormal ring |
| CN108227022A (en) * | 2017-12-29 | 2018-06-29 | 吉林大学 | Air-ground magnetic resonance detection device and detection method based on SQUID |
| CN108983296A (en) * | 2018-06-19 | 2018-12-11 | 长安大学 | A kind of transient electromagnetic and effect of induced polarization decoupling method |
| CN110488357A (en) * | 2019-07-08 | 2019-11-22 | 吉林大学 | A kind of separate type Transient electromagnetic measure compensation system and control method based on SQUID |
| CN110632423A (en) * | 2019-09-26 | 2019-12-31 | 中国科学院上海微系统与信息技术研究所 | Low-temperature physical property testing system and device |
| CN112698410A (en) * | 2020-12-16 | 2021-04-23 | 吉林大学 | Induction-polarization symbiotic time domain electromagnetic detection method for electric source double-phase conductive medium |
| CN113504571A (en) * | 2021-07-23 | 2021-10-15 | 吉林大学 | Polarization equivalent ring device of multiphase conductive medium and design method |
| CN113671582A (en) * | 2021-08-26 | 2021-11-19 | 吉林大学 | Electrical source induction-polarization effect detection method based on three-component SQUID |
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| CN107024722B (en) * | 2017-04-19 | 2018-09-28 | 吉林大学 | A kind of low-temperature superconducting magnetic source transient electromagnetic landform correcting method of lane based on abnormal ring |
| CN106873044B (en) * | 2017-04-19 | 2019-06-11 | 吉林大学 | Array SQUID nuclear magnetic resonance underground water detecting device and imaging method |
| CN106873044A (en) * | 2017-04-19 | 2017-06-20 | 吉林大学 | Array SQUID nuclear magnetic resonance underground water detecting devices and imaging method |
| CN108227022B (en) * | 2017-12-29 | 2021-06-01 | 吉林大学 | Ground-air magnetic resonance detection device and detection method based on SQUID |
| CN108227022A (en) * | 2017-12-29 | 2018-06-29 | 吉林大学 | Air-ground magnetic resonance detection device and detection method based on SQUID |
| CN108983296A (en) * | 2018-06-19 | 2018-12-11 | 长安大学 | A kind of transient electromagnetic and effect of induced polarization decoupling method |
| CN110488357A (en) * | 2019-07-08 | 2019-11-22 | 吉林大学 | A kind of separate type Transient electromagnetic measure compensation system and control method based on SQUID |
| CN110632423A (en) * | 2019-09-26 | 2019-12-31 | 中国科学院上海微系统与信息技术研究所 | Low-temperature physical property testing system and device |
| CN110632423B (en) * | 2019-09-26 | 2021-05-11 | 中国科学院上海微系统与信息技术研究所 | Low-temperature physical property testing system and device |
| CN112698410A (en) * | 2020-12-16 | 2021-04-23 | 吉林大学 | Induction-polarization symbiotic time domain electromagnetic detection method for electric source double-phase conductive medium |
| CN112698410B (en) * | 2020-12-16 | 2022-03-15 | 吉林大学 | Induction-polarization symbiotic time domain electromagnetic detection method for electric source double-phase conductive medium |
| CN113504571A (en) * | 2021-07-23 | 2021-10-15 | 吉林大学 | Polarization equivalent ring device of multiphase conductive medium and design method |
| CN113504571B (en) * | 2021-07-23 | 2022-05-03 | 吉林大学 | Polarization equivalent ring device of multiphase conductive medium and design method |
| CN113671582A (en) * | 2021-08-26 | 2021-11-19 | 吉林大学 | Electrical source induction-polarization effect detection method based on three-component SQUID |
| CN113671582B (en) * | 2021-08-26 | 2023-08-22 | 吉林大学 | Electrical source induction-polarization effect detection method based on three-component SQUID |
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