CN110673220B - Active electromagnetic detection primary field adaptive compensation method - Google Patents
Active electromagnetic detection primary field adaptive compensation method Download PDFInfo
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- CN110673220B CN110673220B CN201911012888.XA CN201911012888A CN110673220B CN 110673220 B CN110673220 B CN 110673220B CN 201911012888 A CN201911012888 A CN 201911012888A CN 110673220 B CN110673220 B CN 110673220B
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- 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
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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
- 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
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Abstract
The invention discloses an active electromagnetic detection primary field adaptive compensation method, which further comprises a sampling coil (1), a gain controller (2), a time delay regulator (3), a compensation coil (4), a magnetic sensor (5), a processor (6), a signal source (7), a power amplifier (8) and an electromagnetic radiator (9), wherein the sampling coil (1) is placed near the electromagnetic radiator (9) or integrated with the electromagnetic radiator (9), the compensation coil (4) is placed near the magnetic sensor (5), and the processor (6) carries out parameter adjustment on the gain controller (2) and the time delay regulator (3) and drives the compensation coil (4) to generate a compensation electromagnetic field. The method is convenient for engineering realization, and can compensate the primary field fluctuation generated by the electromagnetic radiator of the active electromagnetic detection system, so that the primary field component output by the magnetic sensor is minimum.
Description
Technical Field
The invention relates to the technical field of active electromagnetic detection, in particular to a primary field adaptive compensation method for active electromagnetic detection.
Background
Active electromagnetic detection is an important branch of electrical detection. The application of active electromagnetic detection relates to a primary field and a secondary field, wherein the primary field is an electromagnetic field directly radiated by an electromagnetic radiator, and the secondary field is an electromagnetic field generated after the primary field is refracted, scattered, reflected and the like. The principle of active electromagnetic detection is that the secondary field is suddenly changed according to the difference of the magnetic permeability and the dielectric property between a target and the surrounding environment, and the target is detected by observing the change of the secondary field.
During active electromagnetic detection, the magnetic sensor for detecting the secondary field is in the primary field generated by the electromagnetic radiator, and the primary field has strong strength, so that the sensor is generally saturated, or the detected primary field is far larger than the secondary field, which is not beneficial to secondary field detection and identification. Therefore, in the case of active electromagnetic detection, the primary field is not useful for detection, and it is desirable that the primary field output from the magnetic sensor be as small as possible. The current common method is to adjust the installation posture of the magnetic sensor, so that the sensitive axis of the magnetic sensor is orthogonal to the magnetic line of force of the primary field at the position, and thus the primary field cannot be detected, and the effect of eliminating the influence of the primary field is achieved. According to the vector principle, when the included angle between the sensitive axis of the magnetic sensor and the magnetic line of force at the position is, the signal size detected by the magnetic sensor is in direct proportion to the included angle, so that the method has very high requirements on the installation position and the attitude precision of the magnetic sensor, is greatly influenced by the deformation of a carrying platform, and needs to be frequently adjusted or has high difficulty in adjustment; secondly, the metal structure and the magnetic material of the carrying platform can cause electromagnetic field distortion, so that the posture adjustment of the magnetic sensor becomes more difficult; thirdly, due to the variability of the working environment, namely the system needs to work in the environment with different water quality, the adaptability of the system is also required to be higher.
Disclosure of Invention
In order to solve the problems and the defects in the prior art, the invention provides an active electromagnetic detection primary field adaptive compensation method.
The following design structure and design scheme are specifically adopted:
an active electromagnetic detection primary field self-adaptive compensation method comprises the following steps:
step S1: the detection signal is sent to the detector circuit,
taking a signal generated when an active electromagnetic detection system detects as a signal source (7), processing the signal by a power amplifier (8) and then loading the signal on an electromagnetic radiator (9), simultaneously radiating an electromagnetic field by the electromagnetic radiator (9), and coupling the electromagnetic field radiated by the electromagnetic radiator (9) by a sampling coil (1) to obtain a sampling signal; on the other hand, the magnetic sensor (5) generates a detection signal;
step S2: the phase detection and the adjustment are carried out,
the phase of the sampling signal and the phase of the detection signal are respectively detected and obtained through the processor (6), the phase of the sampling signal and the phase of the detection signal are compared, and the parameter of the time delay adjuster (3) is correspondingly adjusted after the phase of the sampling signal is calculated by the processor (6), so that the phase of the sampling signal is adjusted;
step S3: the detection and the adjustment of the amplitude are carried out,
the amplitude of the sampling signal is adjusted by respectively detecting the amplitude of the sampling signal and the amplitude of the detection signal by the processor (6), comparing the amplitude of the sampling signal with the amplitude of the detection signal, and correspondingly adjusting the parameter of the gain controller (2) after calculation by the processor (6);
step S4: the compensation of the driving is carried out,
the sampling signal after the phase and the amplitude are adjusted drives the compensation coil (4) to generate a compensation electromagnetic field, so that the self-adaptive compensation of the primary field of the active electromagnetic detection is realized.
Furthermore, the sampling coil (1) is arranged near the electromagnetic radiator (9) or is integrated with the electromagnetic radiator (9), and can be sufficiently coupled with the primary electromagnetic field generated by the electromagnetic radiator (9).
Furthermore, the compensation coil (4) is arranged near the magnetic sensor (5), and the axial direction of the compensation coil (4) is consistent with the direction of the electromagnetic field sensitive axis of the magnetic sensor (5).
Further, the processor (6) processes the sampling signal of the sampling coil (1) and the detection signal of the magnetic sensor (5) simultaneously.
Compared with the prior art, the invention has the following beneficial effects: the invention reduces the requirements of the position precision and the attitude precision of the installation of the magnetic sensor, can compensate the primary field fluctuation generated by the electromagnetic radiator of the active electromagnetic detection system, can compensate the influence of deformation of a carrying platform and the like on the detection result, and can compensate the change of the detection result of the magnetic sensor caused by the change of the environment. The compensation device can perform real-time self-adaptive compensation according to the primary field detected by the magnetic sensor in the working process, so that the primary field component output by the magnetic sensor is minimum. And the installation positions of the magnetic sensor, the sampling coil and the compensating coil are fixed without readjustment, and the gain controller and the time delay regulator can be automatically or manually regulated through detection system software. Under the conditions of deformation of the carrying platform, water quality parameter change and the like, the carrying platform can be adjusted in real time in the using process.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Reference numerals: 1-a sampling coil; 2-a gain controller; 3-time delay adjuster; 4-a compensation coil; 5-a magnetic sensor; 6, a processor; 7-a signal source; 8-a power amplifier; 9-electromagnetic radiator.
Detailed Description
The following describes embodiments of the present invention in more detail with reference to the accompanying drawings and specific examples.
As shown in fig. 1 of the specification, an active electromagnetic detection primary field adaptive compensation method further comprises a sampling coil 1, a gain controller 2, a time delay adjuster 3, a compensation coil 4, a magnetic sensor 5, a processor 6, a signal source 7, a power amplifier 8 and an electromagnetic radiator 9, wherein,
the sampling coil 1 is placed near the electromagnetic radiator 9 or integrated with the electromagnetic radiator 9, and can sufficiently couple the primary electromagnetic field generated by the electromagnetic radiator 9,
the compensating coil 4 is arranged near the magnetic sensor 5, the axial direction of the compensating coil 4 is consistent with the direction of the electromagnetic field sensitive axis of the magnetic sensor 5,
the processor 6 processes the sampling signal of the sampling coil 1 and the detection signal of the magnetic sensor 5 at the same time, adjusts the parameters of the gain controller 2 and the time delay adjuster 3 according to the condition of the signals, and drives the compensation coil 4 to generate a compensation electromagnetic field.
More specifically, the invention adopts the following specific steps: as shown in fig. 2 of the specification, the signal source 7 is a signal generated when the active electromagnetic detection system detects, and is loaded on the electromagnetic radiator 9 after being processed by the power amplifier 8, the electromagnetic radiator 9 radiates an electromagnetic field, the sampling coil 1 obtains a sampling signal by coupling the electromagnetic field radiated by the electromagnetic radiator 9, and the magnetic sensor 5 generates a detection signal.
The sampling signal is processed by the processor 6 simultaneously with the magnetic sensor 5 to generate a detection signal, the processing processor 6 compares the phase of the sampling signal with the phase of the detection signal generated by the magnetic sensor 5, and the processor 6 adjusts the delay adjuster 3 parameters accordingly.
The processor 6 then also compares the sampled signal with the detected signal generated by the magnetic sensor 5 in amplitude and adjusts the gain controller 2 parameters accordingly after calculation by the processor 6. The driving signal of the compensation coil 4 is derived from the signal of the sampling coil 1 adjusted by the gain controller 2 and the time delay adjuster 3.
Finally, the signal amplitude of the current magnetic sensor 5 needs to be compared with a preset amplitude, if the signal amplitude of the current magnetic sensor 5 is lower than the preset amplitude, the requirement is met, otherwise, the previous steps are repeated.
The scope of the present invention is not limited to the above-described embodiments, which are intended to help explain and illustrate the present invention, but not to limit the scope of the present invention, if it is designed to be the same as or substituted by the equivalent design of the present invention, and fall within the scope of the present invention as claimed.
Claims (4)
1. A self-adaptive compensation method for an active electromagnetic detection primary field is characterized by comprising the following steps: the method comprises the following steps:
step S1: the detection signal is sent to the detector circuit,
taking a signal generated when an active electromagnetic detection system detects as a signal source (7), processing the signal by a power amplifier (8) and then loading the signal on an electromagnetic radiator (9), simultaneously radiating an electromagnetic field by the electromagnetic radiator (9), and coupling the electromagnetic field radiated by the electromagnetic radiator (9) by a sampling coil (1) to obtain a sampling signal; on the other hand, the magnetic sensor (5) generates a detection signal;
step S2: the phase detection and the adjustment are carried out,
the phase of the sampling signal and the phase of the detection signal are respectively detected and obtained through the processor (6), the phase of the sampling signal and the phase of the detection signal are compared, and then the phase of the sampling signal and the phase of the detection signal are calculated by the processor (6), and the parameter of the time delay adjuster (3) is correspondingly adjusted, so that the phase of the sampling signal is adjusted;
step S3: the detection and the adjustment of the amplitude are carried out,
the amplitude of the sampling signal and the amplitude of the detection signal are respectively detected by the processor (6), the amplitude of the sampling signal and the amplitude of the detection signal are compared, and then the amplitude of the sampling signal is adjusted by correspondingly adjusting the parameters of the gain controller (2) after the amplitude of the sampling signal is calculated by the processor (6);
step S4: the compensation of the driving is carried out,
the sampling signal with the adjusted phase and amplitude is taken to drive the compensation coil (4) to generate a compensation electromagnetic field, so that the self-adaptive compensation of the primary field of the active electromagnetic detection is realized.
2. The active electromagnetic detection primary field adaptive compensation method according to claim 1, characterized in that: the sampling coil (1) is arranged near the electromagnetic radiator (9) or is integrated with the electromagnetic radiator (9), so that the sampling coil (1) is fully coupled with the primary electromagnetic field generated by the electromagnetic radiator (9).
3. The active electromagnetic detection primary field adaptive compensation method according to claim 1, characterized in that: the compensation coil (4) is placed near the magnetic sensor (5), and the axial direction of the compensation coil (4) is consistent with the direction of an electromagnetic field sensitive shaft of the magnetic sensor (5).
4. The active electromagnetic detection primary field adaptive compensation method according to claim 1, characterized in that: the processor (6) simultaneously processes the sampling signal of the sampling coil (1) and the detection signal of the magnetic sensor (5).
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| US3956693A (en) * | 1974-12-23 | 1976-05-11 | The Garrett Corporation | Method and apparatus for testing magnetic sensors using a saturable core and variable load resistors to simulate actual test conditions |
| DE102012008194A1 (en) * | 2012-04-26 | 2013-10-31 | Forschungszentrum Jülich GmbH | Electromagnetic conductivity measuring system with improved drift correction |
| GB2523325A (en) * | 2014-02-19 | 2015-08-26 | Vivax Metrotech Ltd | Cable detection apparatus |
| CN206387917U (en) * | 2017-01-18 | 2017-08-08 | 吉林大学 | A kind of aviation transient electromagnetic emission system for possessing Contrary compensation |
| CN109061742B (en) * | 2018-08-29 | 2020-05-12 | 中国地质科学院地球物理地球化学勘查研究所 | Aviation transient electromagnetic receiving signal gain automatic control circuit |
| CN109946744B (en) * | 2019-04-01 | 2020-07-07 | 吉林大学 | Transient electromagnetic exploration system and method based on controllable source compensation |
| CN110361785B (en) * | 2019-06-21 | 2021-04-20 | 中国科学院地质与地球物理研究所 | Aviation transient electromagnetic method receiving compensation device |
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