CN104730584B - Transient electromagnetic receiver - Google Patents
Transient electromagnetic receiver Download PDFInfo
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- CN104730584B CN104730584B CN201310713458.7A CN201310713458A CN104730584B CN 104730584 B CN104730584 B CN 104730584B CN 201310713458 A CN201310713458 A CN 201310713458A CN 104730584 B CN104730584 B CN 104730584B
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Abstract
The present invention provides a kind of Transient Electromagnetic Receiver, including：Superconducting quantum interference device sensor；The synchronizing signal processing unit being connected with the superconducting quantum interference device sensor, for extracting synchronizing signal in the induced signal that is exported from the superconducting quantum interference device sensor；The data acquisition unit being connected with the superconducting quantum interference device sensor and synchronizing signal processing unit, for gathering the induced signal that the superconducting quantum interference device sensor is exported based on the synchronizing signal.Without setting up the synchronised clock matched with emitter, the magnetic signal of the transition that can be launched by induced emission machine determines synchronizing signal to the present invention, has the advantages that simple structure, high precision.
Description
Technical field
The present invention relates to a kind of receiver, more particularly to a kind of Transient Electromagnetic Receiver.
Background technology
Transient electromagnetic method（Transient Electromagnetic Methods, TEM）It is that one kind utilizes earth-free loop line
There is pulsatile once magnetic field to underground, the tempus intercalare in pulsatile once magnetic field is secondary using coil or the observation of other Magnetic Sensors
The method of vortex field.The rule that the secondary field of each time period is changed over time after measuring transmitting shut-off, can obtain not
With the ground electrical feature of depth.
It is general in transmitting coil to apply a kind of positive and negative alternate square wave pulsed current, to produce an electromagnetic field for transition.
In receiver end, receiver receives the secondary field signal through too greatly decaying.The secondary field letter that will can be received in implementation process
Number it is overlapped to improve the signal to noise ratio of signal.The signal that traditional TEM receivers are received is derivative of the secondary field with the time
（Waveform is the pulse of spike type）, do not possess the ability of generation synchronizing signal, the synchronizing signal of superposition is thus be accordingly used in generally from hair
Machine is penetrated with line locking or global positioning system（GPS）Synchronous mode is completed.In practical application, due to TEM transmitting coils one
As than larger, and the distance between transmitting coil and receiver are farther out, and the mode of line locking is heavy, inconvenient.And GPS synchronizations
Mode high cost and system complex, less stable.
Accordingly, it would be desirable to be improved to the method for synchronization of existing receiver.
The content of the invention
The shortcoming of prior art, it is an object of the invention to provide a kind of Transient Electromagnetic Receiver, uses in view of the above
The method of synchronization excessively complicated, stability in Transient Electromagnetic Receiver of the prior art is solved the problems, such as is poor.
In order to achieve the above objects and other related objects, the present invention provides a kind of Transient Electromagnetic Receiver, including：Superconduction amount
Sub- interferometer sensor；The synchronizing signal processing unit being connected with the superconducting quantum interference device sensor, for surpassing from described
Lead and extract synchronizing signal in the induced signal that quantum interfering device sensor is exported；With the superconducting quantum interference device sensor and
The connected data acquisition unit of synchronizing signal processing unit, for gathering the superconductive quantum interference based on the synchronizing signal
The induced signal that device sensor is exported.
Preferably, the synchronizing signal processing unit includes successively according to signal transmission direction：Block isolating circuit, LPF electricity
Road, absolute value circuit, and thresholding comparison circuit.
Preferably, the block isolating circuit includes：It is connected with the superconducting quantum interference device sensor and low-pass filter circuit
Electric capacity, and the earth resistance being connected with the low-pass filter circuit.
Preferably, the block isolating circuit also includes：Positive input terminal is connected and negative with the superconducting quantum interference device sensor
The first comparator that input is connected with itself output end.
Preferably, the low-pass filter circuit includes：Negative input end passes through second that resistance is connected with the block isolating circuit
Comparator, the positive input terminal ground connection of second comparator, also sets between the negative input end and output end of second comparator
The output end for having the electric capacity and resistance of parallel connection, second comparator connects the absolute value circuit.
Preferably, the absolute value circuit includes：Negative input end be connected with the low-pass filter circuit by resistance the
Three comparators, the positive input terminal ground connection of the 3rd comparator, the output end of the 3rd comparator and the negative pole of diode D2
It is connected, the diode D1 and resistance of parallel connection is provided between the negative input end and the positive pole of diode D2 of the 3rd comparator, its
In, the negative pole of diode D1 is connected with the negative input end, and the positive pole of the diode D2 is by two series resistances and the 4th
The output end of comparator is connected；The negative input end of the 4th comparator is connected by resistance with the low-pass filter circuit, institute
The negative input end for stating the 4th comparator is also connected by resistance with the positive pole of the diode D2, the 4th comparator it is negative defeated
Enter and be terminated between described two series resistances, the positive input terminal of the 4th comparator ground connection, the 4th comparator it is defeated
Go out the end connection thresholding comparison circuit.
Preferably, the resistance that is connected with the low-pass filter circuit, the output end located at the 3rd comparator and negative defeated
Enter the resistance of the resistance before end and the resistance between connection the 4th comparator negative input end and the positive pole of diode D2
It is identical；Resistance, the 4th comparator between the negative input end of the low-pass filter circuit and the 4th comparator it is negative
The resistance of the resistance between input and output end is identical, and is the two of the resistance of the resistance being connected with the low-pass filter circuit
Times.
Preferably, the thresholding comparison circuit be 555 chips, 555 chip the 2nd, 6 pins connect respectively it is described absolutely
To value circuit, the 8th, 4 pins connect power supply, the 1st pin ground connection, the 5th pin is by capacity earth, the 3rd pin output synchronizing signal.
Preferably, the data acquisition unit includes：The trigger port being connected with the synchronizing signal processing unit, with institute
The connected acquisition channel of superconducting quantum interference device sensor is stated, and the data being connected with the trigger port and acquisition channel are adopted
Storage.
As described above, Transient Electromagnetic Receiver of the invention, has the advantages that：Without setting up and emitter phase
The synchronised clock matched somebody with somebody, can determine synchronizing signal by receiving the magnetic signal of the transition that emitter is launched, thus can letter
Change the synchronous circuit of Receiver And Transmitter, and can the high-precision magnetic signal to feeding back the magnetic signal that the emitter is sent
（I.e. secondary field signal）Accurately received, there is simple structure, high precision.
Brief description of the drawings
Fig. 1 is shown as the structural representation of Transient Electromagnetic Receiver of the invention.
Fig. 2 is shown as a kind of structural representation of preferred embodiment of Transient Electromagnetic Receiver of the invention.
The letter that each circuit is exported in the synchronizing signal processing unit that Fig. 3 is shown as in Transient Electromagnetic Receiver of the invention
Number oscillogram.
Component label instructions
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages of the invention and effect easily.
Refer to Fig. 1 to Fig. 3.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., is only used to
Coordinate the content disclosed in specification, so that those skilled in the art understands and reads, being not limited to the present invention can be real
The qualifications applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where effect that can be generated of the invention and the purpose to be reached is not influenceed, all should still fall in disclosed skill
In the range of art content is obtained and can covered.
As shown in figure 1, the present invention provides a kind of Transient Electromagnetic Receiver.The Transient Electromagnetic Receiver 1 includes：Superconduction amount
Sub- interferometer sensor 11, synchronizing signal processing unit 12, data acquisition unit 13.
The superconducting quantum interference device sensor 11 include being placed on SPUID under superconduction environment and
The reading circuit being connected with the SPUID.The superconducting quantum interference device sensor 11 is done using Superconducting Quantum
Relate to the magnetic signal that technology will be detected and be converted into electric signal.
The synchronizing signal processing unit 12 is connected with the superconducting quantum interference device sensor 11, for from the superconduction
Synchronizing signal is extracted in the induced signal that quantum interfering device sensor is exported.
Specifically, the magnetic signal launched by transient electromagnetic transmitter is square-wave signal, then the superconductive quantum interference
Device sensor 11 can sense the magnetic signal and the feedback magnetic signal responded by the magnetic signal, and each magnetic letter that will be sensed
Number be converted to induced signal（Electric signal）And the synchronizing signal processing unit 12 is transported to, the synchronizing signal processing unit 12 leads to
Cross the filtering to the induced signal, threshold processing and extract the magnetic signal, and in this, as synchronizing signal.
In the present embodiment, as shown in Fig. 2 the synchronizing signal processing unit 12 includes successively according to signal transmission direction：Every
Straight circuit 121, low-pass filter circuit 122, absolute value circuit 123, and thresholding comparison circuit 124.
The block isolating circuit 121 is used for straight in the induced signal for being exported the superconducting quantum interference device sensor 11
Flow component is filtered.
The block isolating circuit 121 includes：It is connected with the superconducting quantum interference device sensor and low-pass filter circuit 122
Electric capacity, and the earth resistance being connected with the low-pass filter circuit 122.Preferably, the block isolating circuit 121 also includes：Just
The first comparator that input is connected with the superconducting quantum interference device sensor and negative input end is connected with itself output end.
The induced signal that the superconducting quantum interference device sensor is exported can so be isolated, voltage stabilizing is processed.
The electric signal that the low-pass filter circuit 122 is used to be exported the block isolating circuit 121 carries out LPF.
The low-pass filter circuit 122 includes：Negative input end passes through the second ratio that resistance is connected with the block isolating circuit 121
Compared with device, the positive input terminal of second comparator is grounded, and is additionally provided between the negative input end and output end of second comparator
Electric capacity and resistance in parallel, the output end of second comparator connects the absolute value circuit 123.
The negative electricity splenium that the absolute value circuit 123 is used in the electric signal for being exported the low-pass filter circuit 122
Point negate is positive electricity laminate section.
The absolute value circuit 123 includes：Negative input end passes through the 3rd that resistance is connected with the low-pass filter circuit 122
Comparator, the positive input terminal ground connection of the 3rd comparator, the output end of the 3rd comparator and the negative pole phase of diode D2
Even, the diode D1 and resistance of parallel connection are provided between the negative input end and the positive pole of diode D2 of the 3rd comparator, wherein,
The negative pole of diode D1 is connected with the negative input end, and the positive pole of the diode D2 is compared by two series resistances with the 4th
The output end of device is connected；The negative input end of the 4th comparator is connected by resistance with the low-pass filter circuit 122, described
The negative input end of the 4th comparator is also connected by resistance with the positive pole of the diode D2, the negative input of the 4th comparator
It is terminated between described two series resistances, the positive input terminal ground connection of the 4th comparator, the output of the 4th comparator
The end connection thresholding comparison circuit 124.
Wherein, the resistance that is connected with the low-pass filter circuit 122, the output end located at the 3rd comparator and negative defeated
Enter the resistance of the resistance before end and the resistance between connection the 4th comparator negative input end and the positive pole of diode D2
It is identical；
Resistance between the negative input end of the comparator of the low-pass filter circuit 122 and the 4th, the described 4th compare
The resistance of the resistance between the negative input end and output end of device is identical, and is the resistance being connected with the low-pass filter circuit 122
Two times of resistance.
The thresholding comparison circuit 124 is used in the electric signal for being exported the absolute value circuit 123 beyond pre- gating
Regard as the synchronizing signal in the part of limit.
In the present embodiment, the thresholding comparison circuit 124 is 555 chips, 555 chip the 2nd, 6 pins connect respectively
Connect the absolute value circuit the 123, the 8th, 4 pins and connect power supply, the 1st pin ground connection, the 5th pin passes through capacity earth, and the 3rd pin is defeated
Go out synchronizing signal, the 7th pin is empty.It is when the electric signal that the thresholding comparison circuit 124 is received is higher than predetermined threshold value, then high
It is the initial hopping edge of the synchronizing signal in the moment of the threshold value, when the electricity that the thresholding comparison circuit 124 is received
Signal is returned below the threshold value, then return the end hopping edge of the moment correspondence synchronizing signal.Fig. 3 is shown as above-mentioned each
The waveform of the electric signal that circuit is exported.
It should be noted that from the signal waveforms shown by Fig. 3, technical staff is appreciated that above-mentioned block isolating circuit
121st, the signal waveform that low-pass filter circuit 122, absolute value circuit 123 and thresholding comparison circuit 124 are each exported, and by
This obtains the block isolating circuit 121 of other circuit structures similar with the present embodiment, low-pass filter circuit 122, absolute value circuit 123
And thresholding comparison circuit 124.
The data acquisition unit 13 is connected with the superconducting quantum interference device sensor and synchronizing signal processing unit 12,
For gathering the induced signal that the superconducting quantum interference device sensor 11 is exported based on the synchronizing signal.
Specifically, the data acquisition unit 13 is receiving the synchronous letter that the synchronizing signal processing unit 12 is sent
Number the initial hopping edge moment induced signal that the superconducting quantum interference device sensor 11 is exported is acquired, with toilet
State induced signal of other units of receiver 1 to being gathered and be overlapped treatment, until the data acquisition unit 13 is connecing
The reception hopping edge moment for receiving the synchronizing signal stops the sensing being exported to the superconducting quantum interference device sensor 11
Signal is acquired.So complete a collection period.
Wherein, the data acquisition unit 13 includes：The trigger port being connected with the synchronizing signal processing unit 12, with
The connected acquisition channel of the superconducting quantum interference device sensor 11, and the number being connected with the trigger port and acquisition channel
According to collector.
The trigger port can be the interface being connected with the synchronizing signal processing unit 12, and the acquisition channel can be with
It is the interface being connected with the superconducting quantum interference device sensor 11, and the data acquisition unit is then the core comprising Acquisition Circuit
Piece or integrated circuit.
The course of work of the Transient Electromagnetic Receiver 1 is exemplified below：
When the superconducting quantum interference device sensor 11 output includes the induced signal of synchronizing signal, with the superconduction amount
The connected 121 pairs of induced signals of block isolating circuit of sub- interferometer sensor 11 carry out DC component and filter treatment, and will be residing
Induced signal after reason transports to the low-pass filter circuit 122, and LPF is carried out by the low-pass filter circuit 122, then defeated
To the absolute value circuit 123, the waveform of negative voltage is overturn, then transported to the thresholding comparison circuit 124 and extracted
Synchronizing signal is simultaneously exported, and the data acquisition unit 13 receives the initial saltus step of the synchronizing signal by trigger port
Along when, start to carry out over-sampling to the induced signal that the superconducting quantum interference device sensor 11 is exported, so as to follow-up place
Reason unit is overlapped treatment to the data signal for being gathered, and is fed back after the magnetic signal of transmitting transition to observe emitter
Magnetic signal.
In sum, Transient Electromagnetic Receiver of the invention, without setting up the synchronised clock matched with emitter, can
The magnetic signal of the transition launched by induced emission machine determines synchronizing signal, thus can simplify Receiver And Transmitter
Synchronous circuit, and can the high-precision magnetic signal to feeding back the magnetic signal that the emitter is sent（I.e. secondary field signal）Carry out
It is accurate to receive, there is simple structure, high precision.So, the present invention effectively overcomes various shortcoming of the prior art
And have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (7)
1. a kind of Transient Electromagnetic Receiver, it is characterised in that including：
Superconducting quantum interference device sensor；
The synchronizing signal processing unit being connected with the superconducting quantum interference device sensor, for from the superconducting quantum interference device
Synchronizing signal is extracted in the induced signal that sensor is exported；Wherein, the magnetic signal of the transient electromagnetic transmitter transmitting is side
Ripple signal, magnetic signal described in the superconducting quantum interference device sensor sensing and the feedback magnetic signal responded by the magnetic signal,
And each magnetic signal that will be sensed is converted to induced signal and transports to the synchronizing signal processing unit, the synchronizing signal treatment
Unit extracts the synchronizing signal by the filtering to the induced signal, threshold processing；The synchronizing signal processing unit
Include successively according to signal transmission direction：Block isolating circuit, low-pass filter circuit, absolute value circuit, and thresholding comparison circuit；It is described
Low-pass filter circuit includes：The second comparator that negative input end is connected by resistance with the block isolating circuit, described second compares
The positive input terminal ground connection of device, is additionally provided with the electric capacity and resistance of parallel connection between the negative input end and output end of second comparator,
The output end of second comparator connects the absolute value circuit；
The data acquisition unit being connected with the superconducting quantum interference device sensor and synchronizing signal processing unit, for based on institute
Synchronizing signal is stated to gather the induced signal that the superconducting quantum interference device sensor is exported.
2. Transient Electromagnetic Receiver according to claim 1, it is characterised in that the block isolating circuit includes：It is super with described
Lead quantum interfering device sensor and the connected electric capacity of low-pass filter circuit, and the ground connection electricity being connected with the low-pass filter circuit
Resistance.
3. Transient Electromagnetic Receiver according to claim 2, it is characterised in that the block isolating circuit also includes：Positive input
The first comparator that end is connected with the superconducting quantum interference device sensor and negative input end is connected with itself output end.
4. Transient Electromagnetic Receiver according to claim 1, it is characterised in that the absolute value circuit includes：
The 3rd comparator that negative input end is connected by resistance with the low-pass filter circuit, the positive input of the 3rd comparator
End ground connection, the output end of the 3rd comparator is connected with the negative pole of diode D2, the negative input end of the 3rd comparator with
The diode D1 and resistance of parallel connection are provided between the positive pole of diode D2, wherein, the negative pole of diode D1 and the negative input end
It is connected, the positive pole of the diode D2 is connected by two series resistances with the output end of the 4th comparator；
The negative input end of the 4th comparator is connected by resistance with the low-pass filter circuit, the 4th comparator it is negative
Input is also connected by resistance with the positive pole of the diode D2, and the negative input end of the 4th comparator is connected to described two
Between series resistance, the positive input terminal ground connection of the 4th comparator, the output end of the 4th comparator connects the thresholding
Comparison circuit.
5. Transient Electromagnetic Receiver according to claim 4, it is characterised in that the electricity being connected with the low-pass filter circuit
Resistance, the resistance before the output end and negative input end of the 3rd comparator and connection the 4th comparator are born defeated
The resistance for entering the resistance held and between the positive pole of diode D2 is identical；
Resistance, the 4th comparator between the negative input end of the low-pass filter circuit and the 4th comparator it is negative defeated
The resistance for entering the resistance held and between output end is identical, and is the two of the resistance of the resistance being connected with the low-pass filter circuit
Times.
6. Transient Electromagnetic Receiver according to claim 1, it is characterised in that the thresholding comparison circuit is 555 chips,
555 chip the 2nd, 6 pins connect the absolute value circuit respectively, the 8th, 4 pins connect power supply, the 1st pin ground connection, the 5th
Pin is by capacity earth, the 3rd pin output synchronizing signal.
7. Transient Electromagnetic Receiver according to claim 1, it is characterised in that the data acquisition unit includes：With institute
State the connected trigger port of synchronizing signal processing unit, the acquisition channel being connected with the superconducting quantum interference device sensor, with
And the data acquisition unit being connected with the trigger port and acquisition channel.
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| CN201310713458.7A CN104730584B (en) | 2013-12-20 | 2013-12-20 | Transient electromagnetic receiver |
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| CN109061745A (en) * | 2018-08-29 | 2018-12-21 | 中交第公路工程局有限公司 | A kind of tunnel tunnel face transient electromagnetic radar visits water system and visits water installations |
| CN110068870B (en) * | 2019-04-28 | 2020-08-28 | 中国科学院上海微系统与信息技术研究所 | Measuring device and method for superconducting transient electromagnetic signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695982A (en) * | 2010-01-06 | 2012-09-26 | 夏普株式会社 | Dimming device and image display device |
| CN102736114A (en) * | 2011-04-14 | 2012-10-17 | 三捷科技股份有限公司 | Electromagnetic and its combined surveying apparatus and method |
| CN203720369U (en) * | 2013-12-20 | 2014-07-16 | 中国科学院上海微系统与信息技术研究所 | Transient electromagnetic receiver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR0309408A (en) * | 2002-04-22 | 2005-02-01 | Nokia Corp | Media method and system for providing one or more content items for at least one radio system user terminal, and, user terminal |
| WO2012169665A1 (en) * | 2011-06-07 | 2012-12-13 | 한국기초과학지원연구원 | Apparatus for controlling digital alignment coils of tem for ped analysis and apparatus for displaying rotation speed and rotation angle of electronic beam |
-
2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102695982A (en) * | 2010-01-06 | 2012-09-26 | 夏普株式会社 | Dimming device and image display device |
| CN102736114A (en) * | 2011-04-14 | 2012-10-17 | 三捷科技股份有限公司 | Electromagnetic and its combined surveying apparatus and method |
| CN203720369U (en) * | 2013-12-20 | 2014-07-16 | 中国科学院上海微系统与信息技术研究所 | Transient electromagnetic receiver |
Non-Patent Citations (2)
| Title |
|---|
| WTEM高速关断瞬变电磁探测系统;付志红 等;《仪器仪表学报》;20080531;第29卷(第5期);第935页第1栏第2段 * |
| 电磁探测特种电源技术的研究;付志红;《中国博士论文全文数据库 信息科技辑》;20080515(第5期);第2页第2段 * |
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