CN203204173U - Underground mine three-component transient electromagnetic instrument - Google Patents

Abstract

The utility model relates to an underground mine three-component transient electromagnetic instrument which is formed in such a way that an upper position machine (5) is connected with an amplification circuit (3) through a USB interface (5), an MCU (1) and a collection card (2). Three passageways of the amplification circuit (3) are respectively connected with a first receiving wire coil (11), a second receiving wire coil (12), and a third receiving wire coil (13). A power source (4) is connected with the MCU (1) which is connected with an emitting circuit (9) through an optical coupler (7), and a large-power power source (8) is connected with an emitting wire coil (10) through the emitting circuit (9). An emitting part, a receiving part, the large-power power source, and a tablet computer are all designed in a work box, and therefore space of the instrument is saved. Frequency and duty ratio of an emitting current waveform are adjustable. Compared with a conventional transient electromagnetic apparatus, the underground mine three-component transient electromagnetic instrument is advantaged by greatly reduced weight and size. Operation work which is originally finished by three persons can now be done by only one person; manpower, material resources and time are saved; the underground mine three-component transient electromagnetic instrument is not restricted in operation place; and convenience and fastness of application are realized.

Description

Three-component Transient Electromagnetic Apparatus under the mine

Technical field

The utility model relates to a kind of transient electromagnetic instrument, especially can survey simultaneously by three components, and the transient electromagnetic instrument of transceiver.

Background technology

Along with the increase of digitizing, intellectuality and the power of instrument, the soluble problem of transient electromagnetic method is on the increase, and particularly plays good effect in fields such as underground water detection, salting of soil investigation in recent years.At present almost relate to the every field of geophysical survey even comprised sea and air, as seen become one of important geophysical exploration method.

Transient electromagnetic method utilizes earth-free loop line to transient magnetic field of underground emission, square wave current normally, this electric current can induce stable magnetic field underground, after this electric current is closed, can produce an eddy current in the underground medium, eddy current depends on the electric conductivity of underground medium.Had a transient process before this eddy current disappears, can produce the magnetic field of propagating to the earth's surface in this process, this changing magnetic field is converted into the induced voltage of variation in the receiving coil of ground, and we can know the parameter of underground unknown medium by inversion procedure.

The course of work of native system can be divided into emission, filter and amplification and three parts of reception.When being that N, sectional area are the coil of S when being put in the time dependent magnetic field B (t), according to Faraday's electromagnetic induction law, in coil, will produce induction electromotive force V (t), that is: to the number of turn

$V\left(t\right)=-N\frac{\mathrm{d\φ}\left(t\right)}{\mathrm{dt}}=-q\frac{\mathrm{dB}\left(t\right)}{\mathrm{dt}}=-\mathrm{NS}\·\frac{d{\mathrm{\μ}}_0\mathrm{nI}\left(t\right)}{\mathrm{dt}}=-\frac{N^{2}S}{l}\·{\mathrm{\μ}}_0\·\frac{\mathrm{dI}\left(t\right)}{\mathrm{dt}}---\left(\mathrm{1.1.1}\right)$

$B\left(t\right){\∫}_t^{\∞}(V\left(t\right)/q)\mathrm{dt}---\left(\mathrm{1.1.2}\right)$

Wherein φ (t) is the magnetic flux by coil, μ ₀Be the vacuum magnetic capacity, n is loop density, and l is solenoid length, the induction current of I (t) for producing.

By formula 1.1.1 and formula 1.1.2 as can be known, Primary field in the transient electromagnetic method and secondary magnetic field can be reflected by the induction electromotive force in the receiving coil, therefore, process by induction electromotive force being carried out data, just the secondary field curve can be obtained, and then the physical parameter of underground unknown medium can be analyzed.The voltage signal V (t) that observes is proportional to

Can obtain primary field signal V1 (t), secondary field signal V2 (t) that receiving coil observes and the waveform of sampled signal V2 (t).

The transient electromagnetic instrument in use, need to be according to different test requests, be laid to difform coil, according to the minimum square laying of spended time, on physical features smooth ground preferably, need three above collaborative works of people, because the transmitting-receiving separation, minimum needs two people operate simultaneously, and the course of work takes time and effort.Difficult problem in the design process is to reduce to transmit and receive coil dimension, and reduces the transmitter current size.

Summary of the invention

The purpose of this utility model is exactly for above-mentioned the deficiencies in the prior art, and a kind of small portable is provided, and a people is three-component Transient Electromagnetic Apparatus under the exercisable mine.

The utility model is achieved through the following technical solutions:

Three-component Transient Electromagnetic Apparatus under the mine, to be connected through USB interface 5, MCU1 and capture card by host computer 6 to be connected with amplifying circuit 3, three passages of amplifying circuit 3 respectively with the first receiving coil 11, the second receiving coil 12, the 3rd receiving coil 13 connects, power supply 4 is connected with MCU1, and MCU1 is connected with radiating circuit 9 through optocoupler 7, and large power supply 8 connects and composes through radiating circuit 9 and transmitting coil 10.

Described radiating circuit 9 is to amplify 22 by bridge circuit control signal WA16 through first signal, the first field effect transistor 18, the second field effect transistor 19 is connected 23 and is connected with bridge circuit control signal WB17 with secondary signal, bridge circuit control signal WB17 amplifies 24 through the 3rd signal, the 3rd field effect transistor 20, the 4th field effect transistor 21 and the 4th signal amplify 25 and are connected with bridge circuit control signal WA16, the first field effect transistor 18 is connected with the 3rd field effect transistor 20, the second field effect transistor 19 is connected with the 4th field effect transistor 21, the right-hand member of transmitting coil 10 is connected with the left end of sampling resistor 14, the left end of transmitting coil 10 is connected with the line of the first field effect transistor 18 and the 3rd field effect transistor 20, the right-hand member of sampling resistor 14 is connected with the line of the second field effect transistor 19 and the 3rd field effect transistor 20, the positive pole of large power supply 8 and the first field effect transistor 18 be connected the line of field effect transistor 19 and be connected, the line of the negative pole of large power supply 8 and the 3rd field effect transistor 20 and the 4th field effect transistor 21 connects and composes.

Beneficial effect: this transient electromagnetic instrument and panel computer general assembly (TW) are about 15 kilograms, the transmitting coil shape is fixed, need not again lay coil in the scene, the coil dimension plurality of optional, and the frequency of transmitter current waveform and dutycycle are all adjustable, comparing with conventional transient electromagnetic instrument, is that weight or volume have all reduced greatly.Becoming a people by originally three people's operations can finish, and has saved simultaneously human and material resources and time.And coil dimension diminished, and uses also more convenient.

Description of drawings

Fig. 1 is three-component Transient Electromagnetic Apparatus structured flowchart under the mine.

Fig. 2 is the structured flowchart of radiating circuit 9 among Fig. 1.

1MCU, 2 capture cards, 3 amplifying circuits, 4 power supplys, the 5USB interface, 6 host computers, 7 optocouplers, 8 large power supplies, 9 radiating circuits, 10 transmitting coils, 11 first receiving coils, 12 second receiving coils, 13 the 3rd receiving coils, 14 sampling resistors, 16 bridge circuit control signal WA, 17 bridge circuit control signal WB, 18 first field effect transistor, 19 second field effect transistor, 20 the 3rd field effect transistor, 21 the 4th field effect transistor, 22 first signals amplify, and 23 secondary signals are amplified, and 24 the 3rd signals amplify, and 25 the 4th signals amplify.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail:

Three-component Transient Electromagnetic Apparatus under the mine, to be connected through USB interface 5, MCU1 and capture card by host computer 6 to be connected with amplifying circuit 3, three passages of amplifying circuit 3 respectively with the first receiving coil 11, the second receiving coil 12, the 3rd receiving coil 13 connects, power supply 4 is connected with MCU1, and MCU1 is connected with radiating circuit 9 through optocoupler 7, and large power supply 8 connects and composes through radiating circuit 9 and transmitting coil 10.

Described radiating circuit 9 is to amplify 22 by bridge circuit control signal WA16 through first signal, the first field effect transistor 18, the second field effect transistor 19 is connected 23 and is connected with bridge circuit control signal WB17 with secondary signal, bridge circuit control signal WB17 amplifies 24 through the 3rd signal, the 3rd field effect transistor 20, the 4th field effect transistor 21 and the 4th signal amplify 25 and are connected with bridge circuit control signal WA16, the first field effect transistor 18 is connected with the 3rd field effect transistor 20, the second field effect transistor 19 is connected with the 4th field effect transistor 21, the right-hand member of transmitting coil 10 is connected with the left end of sampling resistor 14, the left end of transmitting coil 10 is connected with the line of the first field effect transistor 18 and the 3rd field effect transistor 20, the right-hand member of sampling resistor 14 is connected with the line of the second field effect transistor 19 and the 3rd field effect transistor 20, the positive pole of large power supply 8 and the first field effect transistor 18 be connected the line of field effect transistor 19 and be connected, the line of the negative pole of large power supply 8 and the 3rd field effect transistor 20 and the 4th field effect transistor 21 connects and composes.

The three-component Transient Electromagnetic Apparatus mainly is comprised of three parts under the mine: host computer 6, radiating circuit 9, receiving circuit 2.Three transmitting coils and a receiving coil shape are fixed as square.What adopt is transmitting-receiving mask work pattern, send control word by host computer 6,5 couples of MCU1 control by USB interface, control signal is undertaken after the photoelectricity isolation radiating circuit 9 being controlled by optocoupler 7, the bipolar pulse that in transmitting coil 10, obtains wanting, receiving coil 11, receiving coil 12 and receiving coil 13 amplify by three-channel amplifying circuit 3 after sensing signal, and the signal after the amplification is received by multichannel capture card 2, and on pass MCU1 back and carry out data and preserve.In the course of work, MCU1 is to the bridge circuit two path control signal---and bridge circuit control signal WA16 and bridge circuit control signal WB17, four bridge circuit control signals are amplified the turn-on and turn-off of controlling respectively field effect transistor 18, field effect transistor 19, field effect transistor 20, field effect transistor 21 after 25 through signal amplification 22, signal amplification 23, signal amplification 24, signal.By frequency and the dutycycle of control two path control signal, reach the purpose of control emission signal frequency and dutycycle.When MCU1 disconnects on the WB road during to bridge circuit control signal WA signal, the conducting of WA road, this moment field effect transistor 18 and field effect transistor 21 conductings, namely large power supply 15 consists of the loop through field effect transistor 18, transmitting coil 10, sampling resistor 14 and field effect transistor 21 and large power supply 15.When MCU1 disconnects on the WA road during to bridge circuit control signal WB signal, the conducting of WB road, this moment field effect transistor 19 and field effect transistor 20 conductings, namely large power supply 15 consists of the loop through field effect transistor 19, sampling resistor 14, transmitting coil 10 and field effect transistor 20 and large power supply 15.

Three-component Transient Electromagnetic Apparatus under the mine, as host computer 6 by panel computer, turn IO carries out frequency and dutycycle to CPLD selection through USB, expelling plate produces bipolar pulse, by three passages three receiving coils are carried out data acquisition, upload to capture card 2 through after the amplification filtering, the data that collect show at host computer in real time, and show in real time the transmitter current waveform by sampling resistor.

The data of the capture card 2 that the MCU1 that is made of CPLD receives, amplifying circuit 3 amplifies to received signal, power supply 4 is MCU1, capture card 2 and amplifying circuit 3 power supplies, pass through USB interface 5 and MCU1 communication with host computer 6, host computer 6 is by the optocoupler 7 control radiating circuits 9 of MCU1 and photoelectricity isolation, and large power supply 8 is given radiating circuit 9 and transmitting coil 10 power supplies.

Claims (2)

1. three-component Transient Electromagnetic Apparatus under the mine, it is characterized in that, through USB interface (5) by host computer (6), MCU (1) is connected 2 with capture card) be connected with amplifying circuit (3), three passages of amplifying circuit (3) respectively with the first receiving coil (11), the second receiving coil (12), the 3rd receiving coil (13) connects, power supply (4) is connected with MCU (1), MCU (1) is connected with radiating circuit (9) through optocoupler (7), and large power supply (8) connects and composes through radiating circuit (9) and transmitting coil (10).

2. according to three-component Transient Electromagnetic Apparatus under the mine claimed in claim 1, it is characterized in that, radiating circuit (9) is to amplify (22) by bridge circuit control signal WA (16) through first signal, the first field effect transistor (18), the second field effect transistor (19) is connected (23) and is connected with bridge circuit control signal WB (17) with secondary signal, bridge circuit control signal WB (17) amplifies (24) through the 3rd signal, the 3rd field effect transistor (20), the 4th field effect transistor (21) is amplified (25) with the 4th signal and is connected with bridge circuit control signal WA (16), the first field effect transistor (18) is connected with the 3rd field effect transistor (20), the second field effect transistor (19) is connected with the 4th field effect transistor (21), the right-hand member of transmitting coil (10) is connected with the left end of sampling resistor (14), the left end of transmitting coil (10) is connected with the line of the first field effect transistor (18) with the 3rd field effect transistor (20), the right-hand member of sampling resistor (14) is connected with the line of the second field effect transistor (19) with the 3rd field effect transistor (20), the positive pole of large power supply (8) and the first field effect transistor (18) be connected the line of field effect transistor (19) and be connected, the line of the negative pole of large power supply (8) and the 3rd field effect transistor (20) and the 4th field effect transistor (21) connects and composes.

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