CN109507736B - Array type transient electromagnetic detection system and detection method - Google Patents
Array type transient electromagnetic detection system and detection method Download PDFInfo
- Publication number
- CN109507736B CN109507736B CN201811516726.5A CN201811516726A CN109507736B CN 109507736 B CN109507736 B CN 109507736B CN 201811516726 A CN201811516726 A CN 201811516726A CN 109507736 B CN109507736 B CN 109507736B
- Authority
- CN
- China
- Prior art keywords
- transmitting
- current
- coils
- coil
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01V3/10—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 using induction coils
- G01V3/104—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 using induction coils using several coupled or uncoupled coils
Abstract
The invention relates to an array type transient electromagnetic detection system and a detection method, wherein the system comprises: the device comprises a transmitting circuit, a receiving circuit and an industrial personal computer; the transmission circuit includes: the current-sharing controller comprises four transmitting coils arranged in an array manner and a current-sharing controller which is used for averagely distributing current to the four transmitting coils and ensuring that the current waveforms and amplitudes of the four transmitting coils are the same; the receiving circuit comprises a receiving coil, a transmitting coil array and a receiving circuit, wherein the receiving coil is placed at the geometric center of the transmitting coil array and simultaneously receives a secondary field generated by the exciting magnetic field of the four array transmitting coils; the working condition machine is used for controlling the transmitting current of the transmitting circuit and controlling the transmitting circuit to equally distribute the current flowing to the four transmitting coils according to the acquired transmitting current, so that the consistency of the current waveform and the amplitude is ensured. The array type transmitting method provided by the invention effectively solves the contradiction between the excitation depth and the coil diameter, provides a primary excitation field with higher strength and more uniformity by utilizing the superposition of a plurality of small coils, and is favorable for improving the quality of detection signals.
Description
Technical Field
The invention relates to the technical field of transient electromagnetic underground detection, in particular to an array type transient electromagnetic detection system and a detection method.
Background
At present, the traditional ground transient electromagnetic transmitting system uses a single coil for transmitting, and has two main problems: firstly, the excitation field is not uniform enough, the detection size is closely related to the diameter of the coil, and the excitation depth cannot be obviously improved without increasing the diameter of the transmitting coil. Secondly, the use of a large coil results in a large inductance of the coil, which is not favorable for the generation of transient electromagnetic signals. Therefore, it is of great interest to develop a transient electromagnetic excitation signal that can be achieved with smaller dimensions to a greater excitation depth, while reducing the coil inductance to produce a better quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an array type transient electromagnetic detection system and a detection method, which can effectively reduce the diameter of a single coil and improve the excitation depth.
The invention is realized in such a way that an array type transient electromagnetic detection system comprises:
the device comprises a transmitting circuit, a receiving circuit and an industrial personal computer;
the transmission circuit includes: the current-sharing controller comprises four transmitting coils arranged in an array manner and a current-sharing controller which is used for averagely distributing current to the four transmitting coils and ensuring that the current waveforms and amplitudes of the four transmitting coils are the same;
the receiving circuit comprises a receiving coil, a transmitting coil array and a receiving circuit, wherein the receiving coil is placed at the geometric center of the transmitting coil array and simultaneously receives a secondary field generated by the exciting magnetic field of the four array transmitting coils;
the industrial personal computer is used for controlling the transmitting current of the transmitting circuit and controlling the transmitting circuit to averagely distribute the current flowing to the four transmitting coils according to the acquired transmitting current, so that the consistency of the current waveform and the amplitude is ensured.
Further, the transmission circuit further includes: a sequential control circuit, an IGBT drive and an IGBT H bridge,
the time sequence control circuit controls the working time sequence of the whole system, comprises the transmitting time sequence of the transmitting coil and the acquired triggering time sequence, receives the transmitting frequency control word from the industrial personal computer and controls the triggering frequency;
the IGBT driving module receives a control signal from the sequential control circuit, completes level conversion, drives the IGBT-H bridge to transmit, and evenly distributes currents which are sent by the IGBT-H bridge and flow to four transmitting coils with the same size through the current-sharing controller.
Further, the receiving circuit further includes:
the device comprises a current sampling circuit, a data acquisition card, a receiving coil, a preamplifier and a signal conditioning circuit; wherein the content of the first and second substances,
the current sampling circuit is used for acquiring the transmitting currents of the four transmitting coils, transmitting the transmitting currents to the data acquisition card and passing the data acquisition card;
and the preamplifier is used for preliminarily amplifying the signals of the receiving coil and acquiring the signals by the data acquisition card through the signal conditioning circuit.
Further, the receiving coil is arranged at the geometric center of the transmitting coil array, and simultaneously receives the secondary field generated by the exciting magnetic field of the four array transmitting coils.
Furthermore, the transmitting coils are four multi-turn square coils with the side length of one meter, and the distance between every two adjacent transmitting coils is 2-5 cm.
Furthermore, the receiving coil is a circular receiving coil with the diameter of 10-15cm or a square receiving coil with the side length of 10-15cm, and is placed at the geometric center of the transmitting coil array.
And further, the industrial personal computer compares the currents flowing through the four coils, enters a receiving process if the waveforms are consistent, and returns to the current equalizer to readjust the current equalizing parameters until the current uniformity does not meet the requirement, so that the current is transmitted.
An array type transient electromagnetic detection method comprises the following steps:
s01, arranging four transmitting coils with the diameter of one meter in an array mode on the plane of the area to be detected, laying a receiving coil at the geometric center of the transmitting coil, connecting the array type transient electromagnetic system and the transmitting coil after the coils are laid, and entering a detection process;
s02, setting emission current according to detection requirements, sending the emission current to a logic control unit of the industrial personal computer through the industrial personal computer, resolving the emission current by the logic control unit, and outputting a driving signal to an IGBT (insulated gate bipolar translator) for driving;
s03, after the IGBT drives and finishes level conversion, the IGBT-H bridge is driven to transmit after passing through the current sharing controller;
s04, sampling the emission current of the emission coil by a current sharing controller;
and S05, comparing the currents flowing through the four transmitting coils, entering a receiving process if the waveforms are consistent, and returning to the current-sharing controller to readjust the current-sharing parameters if the current consistency cannot meet the requirement until the current-sharing parameters are consistent and transmitting.
And S06, after the underground medium is excited by the primary field, generating a secondary field, capturing the secondary field by the receiving coil, passing through a series of amplifiers, finally transmitting the acquired data to the signal acquisition card, packaging the received signals according to a specified format by the signal acquisition card, and transmitting the packaged signals to the industrial personal computer.
And S07, the industrial personal computer saves the data and judges whether the detection is finished, if not, the emission and receiving process is repeated from S03, otherwise, the collection is finished.
Furthermore, the transmitting coils are four multi-turn square coils with the side length of one meter, the distance between the transmitting coils is 2-5cm, and the transmitting coils are distributed in a shape of a Chinese character tian.
Furthermore, the receiving coil is a circular receiving coil with the diameter of 10-15cm or a square receiving coil with the side length of 10-15cm, and is placed at the geometric center of the transmitting coil array.
Compared with the prior art, the invention has the beneficial effects that:
(1) the array type transmitting method provided by the invention effectively solves the contradiction between the excitation depth and the coil diameter, provides a primary excitation field with higher strength and more uniformity by utilizing the superposition of a plurality of small coils, and is favorable for improving the quality of detection signals.
(2) The array type transmitting method provided by the invention effectively solves the problem of large detection blind area caused by long turn-off time due to large inductance of the large-size coil, and the small-size coil is used for effectively distributing the inductance in each coil, thereby being beneficial to reducing the turn-off time and further reducing the detection blind area.
(3) According to the array type transient electromagnetic detection system and the detection method, the multi-stage hardware amplification is adopted, so that the signal intensity is effectively improved, an A/D acquisition card with high conversion digits is not required, and the cost is reduced;
additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a block diagram of a novel array type transient electromagnetic detection system;
FIG. 2 is a flow chart of a novel array type transient electromagnetic detection method;
fig. 3 is a signal conditioning block diagram of a novel array type transient electromagnetic receiving coil.
Detailed Description
The present invention will be described in further detail in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic block diagram of a novel array type transient electromagnetic detection system according to an embodiment of the present invention is shown; the system comprises: the device comprises a time sequence control circuit, an IGBT drive, an IGBT-H bridge, a current sharing controller, a first transmitting coil, a second transmitting coil, a third transmitting coil, a fourth transmitting coil, a current sampling circuit, a data acquisition card, a receiving coil, a preamplifier, a signal conditioning circuit and an industrial personal computer.
In the connection relation, the sequential control circuit 1 is connected with an IGBT-H bridge 3 through an IGBT drive 2, and the IGBT-H bridge 3 is respectively connected with a first transmitting coil 5, a second transmitting coil 6, a third transmitting coil 7 and a fourth transmitting coil 8 through a current-sharing controller 4. The first transmitting coil 5, the second transmitting coil 6, the third transmitting coil 7 and the fourth transmitting coil 8 are connected with a data acquisition card 13 through a current sampling circuit 12. The receiving coil 9 receives signals, and the signals are connected with a signal acquisition card 13 through a preamplifier 10 and a signal conditioning circuit 11. The emission current sampling circuit is connected with the signal conditioning circuit 11 and then connected with the industrial personal computer through the data acquisition card 13. The sequential control circuit 1 is connected with an industrial personal computer 14 to form the whole system.
And the time sequence control circuit 1 controls the working time sequence of the whole system, including the transmitting time sequence of the transmitting coil and the triggering time sequence of the data acquisition card. And (3) completing the analysis of the related information: receiving a transmitting frequency control word from an industrial personal computer and controlling the triggering frequency;
the IGBT driving 2 module receives a control signal from the time sequence control circuit, completes level conversion and drives the IGBT-H bridge 3 to transmit;
the current-sharing controller 4 is used for evenly distributing the current which is sent by the IGBT-H bridge 3 and flows to the four transmitting coils, and the coils inevitably have difference, so that the waveforms and amplitudes of the transmitting current of each coil are kept consistent through the current-sharing device;
in one embodiment, the first transmitting coil 5, the second transmitting coil 6, the third transmitting coil 7 and the fourth transmitting coil 8 are four square coils with a plurality of turns and a side length of one meter. The distance between the transmitting coils is 2-5cm, and an electromagnetic field is transmitted to a space to be detected through the coil array to complete excitation; however, the shape of the transmitting coil is not limited to this, and may be rectangular, circular, or other topographically disposed shapes.
The current sampling circuit 12 is used for collecting the emission current of the four emission coils, comprises the size and the shape of a waveform, provides data for the data inversion work in the future, and converts a current signal into a voltage signal by the current sampling circuit 12 so as to be conveniently collected by the data acquisition card 13;
in one embodiment, the receiving coil 9 is a 10cm diameter receiving coil, and is placed at the geometric center of the transmitting coil array, and the receiving coil 9 has a partial area overlapping with the transmitting coil. The main function of the magnetic field sensor is to simultaneously receive a secondary field generated by four array-type coil excitation magnetic fields;
the preamplifier 10 is a differential amplifier composed of a low-noise operational amplifier, and can effectively suppress common-mode noise by using the structure, and the preamplifier performs preliminary amplification on signals of a receiving coil so as to improve the robustness of the signals.
The signal conditioning circuit 11 is composed of a low-pass filter 15 and a secondary amplifier 16, the low-pass filter is mainly used for suppressing high-frequency useless signals and improving the signal-to-noise ratio, and the secondary amplifier is mainly used for further amplifying the signals and is beneficial to the acquisition of the signal acquisition card 13;
the data acquisition card 13 collects the emission current sampled by the emission current sampling circuit and the receiving signal of the receiving coil provided by the signal conditioning circuit, packages the emission current and the receiving signal according to a specified format and uploads the packaged signals to the industrial personal computer 14;
the industrial personal computer 14 summarizes various signals, including storing the transmitting current, storing the receiving signal and storing the current transmitting parameters, and stores the signals in a hard disk for the inversion of the underground structure.
The invention also provides a transient electromagnetic detection method based on the array type transmitting coil, which comprises the following specific implementation steps:
s01, four square transmitting coils with the side length of one meter are arranged on the plane of the area to be measured, the distance between the coils is 2-5cm, the coils are distributed in a shape like a Chinese character 'tian', and the preferable distance is 2 cm. Next, a receiving coil, a circular receiving coil with a diameter of 10-15cm, preferably 10cm, is laid down at the geometric center of the transmitting coil. After the coils are arranged, connecting the array type transient electromagnetic system and the transmitting coil, and entering a detection process;
s02, firstly, emitting current is set according to detection requirements, the emitting current is sent to a logic control unit through an industrial personal computer, and the logic control unit outputs a driving signal to an IGBT (insulated gate bipolar translator) for driving after resolving;
s03, after the IGBT drives and finishes level conversion, the IGBT-H bridge is driven to emit after passing through a current equalizer;
s04, sampling the emission current of the emission coil by a current sharing controller;
and S05, comparing the currents flowing through the four transmitting coils, entering a receiving process if the waveforms are consistent, and returning to the current-sharing controller to readjust the current-sharing parameters if the current consistency cannot meet the requirement until the current-sharing parameters are consistent and transmitting.
And S06, after the underground medium is excited by the primary field, generating a secondary field, capturing the secondary field by the receiving coil, passing through a series of amplifiers, finally transmitting the acquired data to the signal acquisition card, packaging the received signals according to a specified format by the signal acquisition card, and sending the packaged signals to the upper computer.
And S07, the industrial personal computer saves the data and judges whether the detection is finished, if not, the emission and receiving process is repeated from S03, otherwise, the collection is finished.
Claims (4)
1. An arrayed transient electromagnetic detection system, the system comprising:
the device comprises a transmitting circuit, a receiving circuit and an industrial personal computer;
the transmission circuit includes: the current-sharing controller comprises four transmitting coils arranged in an array manner and a current-sharing controller which is used for averagely distributing current to the four transmitting coils and ensuring that the current waveforms and amplitudes of the four transmitting coils are the same;
the receiving circuit comprises a receiving coil, a transmitting coil array and a receiving circuit, wherein the receiving coil is placed at the geometric center of the transmitting coil array and simultaneously receives a secondary field generated by the exciting magnetic field of the four array transmitting coils;
the industrial personal computer is used for controlling the transmitting current of the transmitting circuit and controlling the transmitting circuit to averagely distribute the current flowing to the four transmitting coils according to the acquired transmitting current, so that the waveform and the amplitude of the current are consistent;
the transmitting coils are four multi-turn square coils with the side length of one meter, and the distance between every two adjacent transmitting coils is 2-5 cm;
the receiving coil is a round receiving coil with the diameter of 10-15cm or a square receiving coil with the side length of 10-15cm and is placed at the geometric center of the transmitting coil array;
the industrial personal computer compares the currents flowing through the four coils, if the waveforms are consistent, the receiving process is started, and if the current consistency cannot meet the requirement, the industrial personal computer returns to the current equalizer to readjust the current equalizing parameters until the current consistency is consistent and the emission is carried out;
the transmitting coils are distributed in a shape like a Chinese character 'tian'.
2. The system of claim 1, wherein the transmit circuit further comprises: a sequential control circuit, an IGBT drive and an IGBT H bridge,
the time sequence control circuit controls the working time sequence of the whole system, comprises the transmitting time sequence of the transmitting coil and the acquired triggering time sequence, receives the transmitting frequency control word from the industrial personal computer and controls the triggering frequency;
the IGBT driving module receives a control signal from the sequential control circuit, completes level conversion, drives the IGBT-H bridge to transmit, and evenly distributes currents which are sent by the IGBT-H bridge and flow to four transmitting coils with the same size through the current-sharing controller.
3. The system of claim 1, wherein the receive circuit further comprises:
current sampling circuit, data acquisition card, receiving coil, preamplifier to and signal conditioning circuit, wherein:
the current sampling circuit is used for acquiring the transmitting currents of the four transmitting coils, transmitting the transmitting currents to the data acquisition card and passing the data acquisition card;
and the preamplifier is used for preliminarily amplifying the signals of the receiving coil and acquiring the signals by the data acquisition card through the signal conditioning circuit.
4. An array type transient electromagnetic detection method is characterized by comprising the following steps:
s01, arranging four transmitting coils with the diameter of one meter in an array mode on the plane of the area to be detected, laying a receiving coil at the geometric center of the transmitting coil, connecting the array type transient electromagnetic system and the transmitting coil after the coils are laid, and entering a detection process;
s02, setting emission current according to detection requirements, sending the emission current to a logic control unit of the industrial personal computer through the industrial personal computer, resolving by the logic control unit, and outputting a driving signal to an IGBT for driving;
s03, after the IGBT drives and finishes level conversion, the IGBT-H bridge is driven to transmit after passing through the current sharing controller;
s04, sampling the emission current of the emission coil by a current sharing controller;
s05, comparing the currents flowing through the four transmitting coils, entering a receiving process if the waveforms are consistent, and returning to the current-sharing controller to readjust the current-sharing parameters if the current consistency cannot meet the requirement until the current-sharing parameters are consistent and transmitting;
s06, the underground medium is excited by the primary field to generate a secondary field, the secondary field is captured by the receiving coil, the secondary field passes through a series of amplifiers, the acquired data is finally transmitted to a signal acquisition card, the signal acquisition card packages the received signals according to a specified format and transmits the packaged signals to the industrial personal computer,
s07, the industrial personal computer saves the data and judges whether the detection is finished, if not, the emission and receiving process is repeated from S03, otherwise, the collection is finished;
the transmitting coils are four multi-turn square coils with the side length of one meter, the distance between the transmitting coils is 2-5cm, and the transmitting coils are distributed in a shape like a Chinese character 'tian';
the receiving coil is a circular receiving coil with the diameter of 10-15cm or a square receiving coil with the side length of 10-15cm and is placed at the geometric center of the transmitting coil array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516726.5A CN109507736B (en) | 2018-12-12 | 2018-12-12 | Array type transient electromagnetic detection system and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811516726.5A CN109507736B (en) | 2018-12-12 | 2018-12-12 | Array type transient electromagnetic detection system and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109507736A CN109507736A (en) | 2019-03-22 |
| CN109507736B true CN109507736B (en) | 2021-04-20 |
Family
ID=65752284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811516726.5A Active CN109507736B (en) | 2018-12-12 | 2018-12-12 | Array type transient electromagnetic detection system and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109507736B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837124A (en) * | 2019-05-20 | 2020-02-25 | 湖南普力海洋科技有限公司 | Deep sea radial shielding electromagnetic detection device |
| CN110488356B (en) | 2019-08-23 | 2020-08-21 | 清华大学 | Transient electromagnetic and magnetic field gradient combined detection method for unexploded bomb |
| CN110488358B (en) | 2019-08-23 | 2020-10-16 | 清华大学 | Moving and fixed source combined transient electromagnetic detector for unexploded bomb and detection method thereof |
| CN110487891A (en) * | 2019-09-09 | 2019-11-22 | 西安石油大学 | A kind of casing damage detection method, device and system based on transient electromagnetic emission array |
| CN110865414B (en) * | 2019-11-01 | 2021-02-02 | 吉林大学 | Transient electromagnetic noise suppression method for urban underground space detection |
| CN111580173B (en) * | 2020-06-04 | 2022-06-10 | 山东大学 | Metal object detection sensor and detection device |
| CN112363232A (en) * | 2020-11-21 | 2021-02-12 | 中北大学 | Metal detection system under multimode array excitation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202522711U (en) * | 2012-03-23 | 2012-11-07 | 刘冀成 | Primary field excitation device based on transient electromagnetic method |
| CN204496021U (en) * | 2015-04-13 | 2015-07-22 | 吉林大学 | A kind of transient electromagnetic device of amplifying transient electromagnetic signal based on sectional type |
| CN204925412U (en) * | 2015-09-14 | 2015-12-30 | 吉林大学 | Superconductive transition electromagnetic emission of low temperature machine based on RC and many C cascade |
| CN105743385B (en) * | 2016-04-26 | 2018-05-04 | 吉林大学 | A kind of Transient Electromagnetic Transmitter current waveform shaping circuit |
| CN107272074A (en) * | 2017-05-16 | 2017-10-20 | 中国矿业大学(北京) | A kind of apparatus and method for realizing Mine transient electromagnetic focusing-detection |
| CN207181713U (en) * | 2017-11-27 | 2018-04-03 | 吉林大学 | A kind of grounded screen mesh topology detection device based on array matrix distribution |
-
2018
- 2018-12-12 CN CN201811516726.5A patent/CN109507736B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109507736A (en) | 2019-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109507736B (en) | Array type transient electromagnetic detection system and detection method | |
| CN104297807B (en) | Magnetic resonance imaging device for underground disaster water source detection and detection and imaging method | |
| CN102159962B (en) | Bucking coil and b-field measurement system and apparatus for time domain electromagnetic measurements | |
| US20160064994A1 (en) | Method of controlling wireless power transmission system, wireless power receiving apparatus and method of transmitting wireless power | |
| US8294465B2 (en) | Switched mode pre-amplification and am feedback for on-coil switched mode amplifiers in parallel transmission MRI | |
| CN106908847A (en) | A kind of air-ground nuclear magnetic resonance underground water detection system and detection method | |
| CN102915571B (en) | Roadside unit, board units signal screening system and signal screening method | |
| CN102323622A (en) | Line array multi-channel synchronous transient electromagnetic directional detection method and device thereof | |
| CN104569745B (en) | Live testing apparatus for local discharge and method | |
| CN101957705B (en) | Electromagnetic handwriting equipment and noise recognizing method thereof | |
| CN104977352A (en) | Defect and stress non-destructive testing system and non-destructive testing method based on pulsed eddy current and Barkhausen | |
| CN102064381B (en) | Induction antenna, electromagnetic handwriting device and antenna plate thereof | |
| CN103033849A (en) | Multichannel nuclear magnetic resonance underground water detecting instrument and field work method thereof | |
| CN105484740A (en) | Multi-frequency detection device for detecting stratum complex resistivity | |
| CN105717191A (en) | Detection method and device for magnetic Barkhausen noise signal and magnetic parameters | |
| CN104060986B (en) | Multi-frequency array electrical logging resonant launching system | |
| CN1292265C (en) | Pseudo-random three frequency geoelectric response measuring device and method for geoelectric field | |
| CN111796331B (en) | Ground magnetic resonance detection device and method for shallow groundwater and hydrocarbon substances | |
| CN105572232A (en) | Low frequency electromagnetic ultrasonic guided-wave receiving signal amplifying method and device | |
| CN110989004B (en) | Self-compensation three-component dragging transient electromagnetic exploration device and exploration method | |
| CN104453868B (en) | Device and method for synthesizing emission signals of induction logging instrument and induction logging method | |
| CN111175834B (en) | Towed transient electromagnetic detection device and method based on whole-process acquisition technology | |
| CN111290037B (en) | Device and method for magnetic resonance nondestructive in-situ detection of underground organic pollutants | |
| CN203204173U (en) | Underground mine three-component transient electromagnetic instrument | |
| CN105785458A (en) | Anti-saturation device and anti-saturation method of ground magnetic resonance signal amplification circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Lin Tingting Inventor after: Li Suhang Inventor after: Sun Deli Inventor after: Chen Jian Inventor after: Pi Shuai Inventor after: Zhang Yang Inventor before: Lin Tingting Inventor before: Sun Deli Inventor before: Chen Jian Inventor before: Pi Shuai Inventor before: Zhang Yang |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |