CN1130573C - Method and instrument for detecting underground magnetofluid to search water - Google Patents

Abstract

The present invention relates to a detection method and a detector for exploring underground water sources, which solves the problem of multiple observation results of geophysical water exploration instruments. In the present invention, electromagnetic field signals detected by probes inserted in the earth surface are treated by impedance conversion, range adjustment and amplification, and frequency selection by frequency selection networks to detect different magnetotelluric field signals, and dynamic information is extracted to determine the distribution of water flowing fractured zones; then, the depth of a well is determined according to the frequency of frequency selection, and the quantity of underground water flow is qualitatively analyzed by amplitude values and frequency in dynamic information. The present invention has the characteristics of simplicity, applicability, unique detection result and high precision, and is suitable for water supply, water conservancy projects, mines on the aspect of prevention and control of water, etc.

Description

Underground magnetofluid to search water detection method and detector

Technical field

The present invention relates to a kind of water detection with underground geophysical prospecting method and instrument, particularly a kind of multidate information that utilizes underground magnetic fluid is sought the detection method and the detector of underground water source, is applicable to that aspects such as water supply, hydraulic engineering, mine water management use.

Background technology

The first-elected electrical method of ground geophysical prospecting method water detection at present, the very low frequency method that next has the radioactivity prospecting method and measures the stratum magnetic component, the common ground of said method are to be applied in the geophysical prospecting method of seeking the solid mineral products to look on the underground water.Surface instrumentation measured value reflection be geologic body rerum natura integrated value, belong to static information, this physical quantity is shown is that underground the sort of solid mineral products or underground water are entirely with exponent's subjective experience.So the water detection success ratio of said method has only 40%-50, the multi-solution of its physical prospecting curve that has its source in.

Summary of the invention

The object of the present invention is to provide a kind of detection method and the detector that can accurately survey the underground water data.

For achieving the above object, the inventive method may further comprise the steps:

With probe in detecting mt field information, regulate and amplifying circuit carries out delivering to the variable frequency selection network of centre frequency after signal amplifies through impedance inverter circuit and range;

The variable frequency selection network of centre frequency detects the nagneto-telluric field static information and the multidate information of different frequency, extracts the wherein amplitude and the frequency of multidate information, and the feed signals treatment circuit handles, by this amplitude and frequency qualitative analysis groundwater flow size;

Determine that by static information water conducted zone distributes;

Determine well depth by frequency-selecting frequency f and formation resistivity ρ $h=969.5\sqrt{\frac{p}{f}}.$

This underground magnetofluid to search water detection method has solved the problem of water detection geophysical prospecting equipment observed result multi-solution in the past, by the multi-solution unique solution of making a leapleap forward, the hit rate that has improved sink wells greatly with become the well rate, reduce the water source prospecting cost, improved economic benefit greatly.This method is simple and practical, the instrument volume is little, cost is low, pole span is adjustable, it decides the well precision up to below one meter, but independent operation is decided well, also can be connected the macroanalysis of carrying out well location and the well location degree of depth and becoming well yield etc. with host computer (ordinary PC) by serial port.It can measure dam leakage, and underground utilities are surveyed and grotto is surveyed, 0-300 rice with interior effectively.All can use at water supply, hydraulic engineering, mine water management etc.

Description of drawings

Fig. 1 is that underground water conducted zone schematic cross-section and detector use synoptic diagram

Fig. 2 is a detector circuit block diagram of the present invention

Fig. 3 is that the present invention detects embodiment one circuit theory diagrams

Fig. 4 is that the present invention detects embodiment two circuit theory diagrams

Fig. 5 is that the present invention detects embodiment three-circuit schematic diagram

Fig. 6 is the figure of face of land electric field branch that the present invention records by three kinds of different frequencies

Fig. 7 is that probe of the present invention is at face of land distribution plan

Below in conjunction with accompanying drawing the present invention is described in further detail.

Embodiment

Underground water in the rock stratum carries out mass exchange and conversion with the rock stratum under the effect of gravity, form the Groundwater Flow system that is made up of supply, runoff, drainage three parts.Underground water is the widest optimum conductor that distributes, according to the law of electromagnetic induction, ground water regime is persistent movement in the terrestrial magnetic field, and producing complicated electromagnetic induction becomes magnetic fluid, the magnetic fluid of different depth feeds back the field of transient electrical magnetic wave earthward, and its shape and Groundwater Flow system are complementary on ground.As long as therefore record distribution field, just can find the distribution of Groundwater Flow system at the transient electrical magnetic wave on the face of land; So, deciding well has been a difficult matter no longer just.Have only mobile underground water to feed back the transient electrical magnetic wave earthward in the geologic body of underground different depth, so the uniqueness that the physical prospecting achievement is explained is also just not ccontaining doubtful.

The theoretical foundation of detection method of the present invention is the magnetic fluid theory.Be that underground water guide fracture section synoptic diagram and detector use synoptic diagram as shown in Figure 1, among Fig. 1, B is the component of terrestrial magnetic field at orthogonal directions, and V is the flow direction of fluid in the tomography, according to the law of electromagnetic induction, will produce the induction electromotive force of an alternation in the E direction.Like this, detector just detects the induction electromotive force (phreatic multidate information) of alternation by probe A1 and A2.Water detection of the present invention is by certain interval probe to be inserted the face of land to detect telluric electricity field information with underground hydromagnetic fluid detection method, behind impedance inverter circuit and range adjusting and amplifying circuit, detect the telluric electricity field amplitude of same frequency down with the variable frequency selection network of centre frequency, when finding that electric field magnitude is multidate information, can determine that this place's underground water has water conducted zone to exist, and the make location, determine well depth according to the frequency-selecting frequency then, comprise static information and multidate information two parts.What static information reflected is the integrated value of geologic body metamorphosis, analysis and subterranean strata to water conducted zone are surveyed useful, and the Changing Pattern and the variation range of the underground magnetic fluid of multidate information (amplitude and two factors of frequency of comprising its variation) reflection, this is the information that the water detection Ding Jing aspect utmost point has using value, when analyzing static information, consider the influence of multidate information, when handling multidate information, consider the constraint of static information.To the analysis and processing method of measurement data be since in the electromagnetic wave direction of vibration in electric field and magnetic field be orthogonal, and direction of vibration also is to want vertical mutually with direction of wave travel, therefore the transient electrical magnetic wave of the visual telluric electricity field of ground detection point (apart from the field source of telluric electricity field place far away) is a plane wave, it exists perpendicular to ground, Changing Pattern is obeyed the Maxwell system of equations, so the theoretical formula of instrument investigation depth is $h=969.5\sqrt{\frac{p}{f}}$ (rice), ρ is rock stratum apparent resistivity (Ω .m) in the formula, f is frequency-selecting frequency of operation (HZ), and h is investigation depth (m), from formula as can be known, for a certain measurement point, apparent resistivity ρ is a definite value, and when frequency f is low more, penetration depth is just dark more, reach change depth of exploration this purpose, apparent resistivity by changing frequency-selecting $\mathrm{\ρ}=\frac{1}{s\·f}(\frac{\mathrm{Ex}}{\mathrm{Hy}}{)}^2(\mathrm{\Ω}\·m)$ In the formula: the frequency of operation (HZ) when f is measurement, EX and HY are respectively the electric component and the magnetic component of measurement point, but can be by measuring the electric component under the different frequency, utilize the relation of electric component EX and apparent resistivity ρ again, can qualitative explanation obtain the still low resistance body of unusual high resistance body, the ultimate principle of Here it is this method abnormal curve qualitative interpretation.

The circuit block diagram of detector of the present invention as shown in Figure 2, it is to detect telluric electricity field information by at a certain distance probe A being inserted the face of land, be coupled to impedance inverter circuit 1 through capacitor C, exporting range to regulates and puts into big circuit 2 and carry out after signal amplifies, deliver to the variable frequency selection network 3 of centre frequency, export signal Processing and display circuit 4 to, the effect of carrying out impedance conversion is the influence of avoiding different check point the earth surface impedances to differ.The problem that the telluric electricity field signal of the solution different regions of range conversion is strong and weak different.Fig. 3, Fig. 4, Fig. 5 are three embodiment circuit theory diagrams of detector of the present invention.

Embodiment one: as shown in Figure 3: detector is by probe A1 and the detected telluric electricity field signal of A2, through being to hold C1 to be coupled to by field effect transistor BG1 and outer meeting resistance, the impedance inverter circuit 1 that electric capacity constitutes, the emitter follower circuit that output is formed through triode BG2, output is amplified and the 50HZ trapper through the range conversion that capacitor C 3 is coupled to IC3A (TL064 low-power consumption device amplifier) and peripheral cell composition, the W1 potentiometer is used to change range ability among the figure, by resistance R 7, R8, R9 and capacitor C 5, C6, C7 forms the double-T shaped wave filter of 50HZ, be used for when the ground of dynamic cable process region measurement, anti-power frequency is disturbed, do not needing when anti-interference, K switch 1 among Fig. 3 is connected, telluric electricity field signal after the amplification is coupled to by electronic switch IC1 through capacitor C 8, IC2, IC4 (CD4051) and amplifier IC3B, IC3C and peripheral resistance, centre frequency and eight grades of adjustable bandpass filter of Q value that electric capacity is formed, the telluric electricity field signal of the assigned frequency of sending through bandpass filter is coupled to the rectification circuit that amplifier IC3D and diode are formed through capacitor C 26, the direct current amplitude of the telluric electricity field signal after the rectification is sent direct current milivoltmeter MV indication, returns to zero to milivoltmeter when potentiometer W2 is used to start shooting the no signal input.The frequency selection network essence of this embodiment is an adjustable bandpass filter of centre frequency, and its effect is a signal amplitude of selecting assigned frequency from the telluric electricity field signal of complexity.Rupture surface with Fig. 1 is that example illustrates its detection method: when the position that (1) goes up A1 and A2 with probe by figure is placed and is measured, the low and phenomenon (being multidate information) that swing with pointer of the indicated amplitude of milivoltmeter is little when big during amplitude of fluctuation; When (2) two pins being placed the right of figure A2 measure, the indicated telluric electricity field amplitude of milivoltmeter is than higher slightly in (1), but pointer does not have dancing; When (3) two pins being placed the left side of figure A2 measure, the indicated telluric electricity field amplitude of milivoltmeter is than all wanting higher and do not swing in (1) and (2).Measurement shows: between probe A1 and A2, have a water conducted zone to exist, because water conducted zone is low resistance state (water is optimum conductor), so measure the telluric electricity field amplitude low, multidate information (being the phenomenon that pointer swings), illustrating has Groundwater Flow system flow mistake in this zone of fracture; It is basement rock that probe A1 is in its left side, is high-impedance state, so the amplitude height that records; After the basement rock on probe A2 place and the right thereof sinks, fill up the layer that loosens the soil (layer containing a large amount of moisture content because of loosening the soil) above again and be low resistance state, thus measure electric field magnitude low slightly.Like this, we adopt " Leapfrog type " probe to move method and measure between A1 and A2, can bring up to below 1 meter deciding the well precision.After determining well location, further measuring and estimating needs well-digging deeply, at this moment still measure between A1 in Fig. 1 and the A2, pass through to switch different RC filtering circuit in the frequency selection network during measurement, respectively the signal of different frequency in the telluric electricity field is measured, find out the frequency range at multidate information place, so promptly estimate the degree of depth in the hole of need digging a well according to propagation property of electromagnetic wave.

Present embodiment two, as shown in Figure 4, the detector circuit, probe A1, the telluric electricity field information that A2 measures number is coupled to impedance inverter circuit through C1, impedance inverter circuit is by field effect transistor BG1, resistance R 1-R5 and capacitor C 1, C2 forms, signal after impedance conversion is through R6, R7 send IC3 and two high precision of IC4 respectively, low-power consumption, quick comparer (TL3016), IC1 and IC2 are four digital potentiometers (X9241), it has storage or single-chip microcomputer is directly read the digitized positions of sliding end tap, support new features such as two-wire serial communication agreement, make the circuit structure and the software programming of instrument all oversimplify like this, the complicacy that has saved A/D, because the circuit to digital potentiometer connects serial connection technology connection of employing software vernier and control, makes the comparison precision bring up to 0.15mV (satisfying measurement requirement fully); WY1 is precision stabilized voltage supply MOC1403, is used to provide the high-end parameter voltage of two digital regulation resistances; 8 LED charactrons and keyboard are connected with PO mouth, P2 mouth and the P1.3 of single-chip microcomputer IC5 by transistor display (ULN2803) IC6, resistance R 9-R17, constitute the display keyboard sweep circuit, demonstration and keyboard employing dynamic scan mode; The measurement data storer that the P1.4 of 8 serial storagies such as IC8-IC15 and single-chip microcomputer, P1.5 form this instrument, the memory space of every serial storage are 2048 bit bytes.Therefore, the total storage capacity of instrument can reach 8 * 2048=16384 byte, and enough storage apparatus field acquisitions one day are from last data; The control core of instrument is selected the AT89C51 single-chip microcomputer for use, its pin and order set and general MCS-51 series monolithic compatibility, but the Low-Power CMOS chip of its to be a kind of inside carry 4K program (need not expand) is fit to this instrument selection very much.

The course of work of detector is as follows: telluric electricity field information detects by probe A1, A2, carries out impedance conversion through field effect transistor BG1 (3GJ6) and peripheral circuit, send inverting input and the comparer IC4 in-phase input end of comparer IC3 then respectively; IC3 in-phase input end and comparer IC4 inverting input provide comparative voltage by two four digital potentiometer IC1 and IC2 respectively, when producing, the INTO of single-chip microcomputer interrupts like this, the setting value of detection signal greater than IC1 is described, when INT1 produces interruption, the setting value of detection signal less than IC2 is described, the two-wire serial bus of the software of single-chip microcomputer by constituting by P1.0 and P1.1, regulate the setting value of IC1 and IC2, up to INTO, till INT1 does not all interrupt, like this, illustrate that detected value is between the setting value of IC1 and IC2, the setting value (being the digitized positions of the sliding end of digital potentiometer) that single-chip microcomputer is read IC1 and IC2 by the two-wire serial bus is easy to draw the amplitude of detection signal through computed in software.Measure the signal frequency of this moment if desired, after then the signal amplitude that detects can being got intermediate value, be used to reset the IC2 digital potentiometer, use IC4 to form a similar zero-crossing comparator (be about to detection signal and become pulse signal), close and interrupt the pulse of IC4 output being counted, just can measure the frequency of signal this moment with the T1 counter.Whenever finish after the one-shot measurement, single-chip microcomputer send demonstration (high 4 segment voltage values, low 4 display frequency values) with magnitude of voltage and the frequency values of being surveyed, and simultaneously magnitude of voltage and frequency values is sent in the serial storage by the two-wire serial bus that P1.4, P1.5 constitute.

After detection finishes, we can carry out mapping analysis by the data that keyboard accesses each measurement, still the rupture surface with Fig. 1 is that example detects explanation: (1) is as the A1 that probe the placed Fig. 1 left side in one's power, instrument is regulated the setting value of digital potentiometer IC1 and IC2 automatically by software, judge the amplitude range of detection signal according to the interruption situation of INTO and INT1, monolithic is read the setting value of IC1 and IC2 like this, just can calculate the amplitude E1 of measured signal, the amplitude E1 aperiodicity variation phenomenon of this moment is not so need here signal is carried out frequency detecting; (2) probe is placed figure A2 place and the right.Record electric field magnitude E2 by method in (1), E2＜E1 and aperiodicity variation phenomenon be not so carry out frequency measurement; (3) two probes are placed the A1 of Fig. 1 and A2 place measure, still use the method for (1) to record telluric electricity field amplitude E3, at this moment find: E3＜E2＜E1, and there is the cyclical variation phenomenon, change the measuring method of instrument by keyboard, change the amplitude measurement that just carries out into frequency measurement, being instrument is used to set the value of IC2 with the intermediate value of the electric field magnitude that records previously, make IC2 and IC4 constitute the comparer of a given base value, this moment, the IC4 output signal was and the pulse signal of telluric electricity field signal with frequency, single-chip microcomputer is turned off interruption, carry out timer counter by T1 pin pulse signals, just can measure telluric electricity field signal frequency F3 herein, according to above testing result E1, E2, E3 and F3 analyze as can be known; The A1 and the left side belong to basement rock, and the basement rock on A2 and the right sinks.One water conducted zone is arranged between A1 and the A2, show have mobile ground water regime to exist in this water conducted zone by multidate information, by the method make location of " Leapfrog type " traveling probe in the scheme one, estimate the degree of depth that needs to dig a well according to the electric field frequency F3 that records and get final product then.

Embodiment three, and as shown in Figure 5, it can measure with the basic realization of processing intelligent to data.

This embodiment detecting instrument can detect automatically to the telluric electricity field of 5-240 rice scope, can join 2-12 root probe, selects an electronic switch to switch by IC1 and two CD4051 eight of IC2; 12 probes can adopt the large-scale telluric electricity field of automatic itinerant monitor system to change with advancing to use, and also optional wherein 2 (or more) probes position measurement; The X7 of IC1 and the Y7 of IC2 connect the public ground of instrument, are used for the automatic zero adjustment of each time spent of instrument, if modified value is then introduced in zero shift automatically; The X6 of IC1 and IC2 and Y6 are used for working power and monitor automatically, and when finding that the employed battery of instrument is under-voltage, automatically prompting user is changed battery, avoids the measuring error that causes because of the cell voltage deficiency.12 terminals such as the X0-X5 of IC1 and Y0-Y5 can external 2-12 root (1-6 to) probe (being determined according to measurement range by the user) can be selected to use also and can detect by the sequential loop of setting in 12 (6 pairs) probes by keyboard for any 2 of per 6 probes that join with IC1 and IC2 by the user.This control is passed through P1.2, P1.3 and three mouth lines of P1.4 and IC3 SI PO shift register (switching of IC3A control IC1, IC3B control IC2 switches) by single-chip microcomputer and is finished.Detected telluric electricity field signal is input to the impedance inverter circuit of being made up of 3DJ and peripheral cell by the X end of IC1 and the Y end of IC1, IC6 four digital potentiometers, POT3 carries out the range conversion that dividing potential drop (being provided with 0-63 shelves intrinsic standoff ratio electricity can be regulated by the single-chip microcomputer numerical control) realizes detection signal to the signal after impedance conversion, and the telluric electricity field signal after the dividing potential drop is coupled to by IC4 through capacitor C4, IC5, the amplification that the POT2 of IC6 and peripheral resistance capacitance are formed, (gain centre frequency and Q value all can be by the bandpass filter of single-chip microcomputer numerical control adjusting for the power frequency notch filter of 50HZ and numerical control frequency selection network.The telluric electricity field signal of selecting assigned frequency is coupled to the P1.0 end of single-chip microcomputer through capacitor C11) be the in-phase input end of precision comparator single chip computer AT 89C2051 sheet in, two digital potentiometers of the POT0 of IC6 four digital potentiometers, POT1 are used to provide the reference voltage of inverting input P1.1 of the interior comparer of sheet of single chip computer AT 89C2051.The POT0 of IC6 with the output voltage dividing potential drop of accurate voltage stabilizer IC7 after as the high terminal voltage of the POT1 of IC6, the sliding end tap of the POT1 digital potentiometer of IC6 connects the P1.1 end of single-chip microcomputer.The control core of instrument is the AT89C2051 single-chip microcomputer, it is a kind of low-voltage, high-performance CMOS eight-bit microcontroller of the 2K of carrying byte flash memory, adopt the DIP20 encapsulation, compatible mutually with the MCS-51TM instruction set and the output pin of industrial standard, and (P1.0 and P1.1 are respectively the in-phase input end and the inverting input of precision comparator in the sheet to be provided with an accurate analog comparator in the sheet, P3.6 is the output terminal of comparer), this C PU provides a dirigibility high and inexpensive scheme for this instrument.The P1.5 of single-chip microcomputer and P1.6 constitute the two-wire system universal serial bus to be realized the control of digital potentiometer IC5 and IC6 and writing and reading of six serial storages of IC11-IC16; LCM LCD MODULE SMS1204 is adopted in the display part, and its operating voltage is: 3.5.-5.5V, exemplary operation electric current only are 1mA, and inside carries latchs, and adopts the serial port of standard to be connected with single-chip microcomputer; Because the demonstration and 232 communication interfaces of instrument are not to use simultaneously, therefore show serial port with the time sharing shared single-chip microcomputer of communication; Usually under the state, serial data is sent demonstration; Under the communications status, the display module demonstration is also latched prompting character, forbid the video data input by P3.7 output high level then, single-chip microcomputer is set up serial communication by IC9 (ICL232) with the RS-232 interface of upper PC and is connected, to realize detecting reading or purpose monitoring work of data.The keyboard of instrument is set to interrupt scanning keyboard (P1.7, P1.2, P3.3, P3.4 and P3.7 and IC10 form), P3.7 and P1.7 double as scanning output, and P3.3 and P3.4 do the scanning input; During keyboard scan, P3.7 and P1.7 output high level, arbitrary key is pressed and all can be made INTO (P3.2) produce interruption, reads the level of P3.3 and two mouth lines of P3.4 during interruption and can learn key assignments; The duty of detector is selected and being provided with all of various parameters finished by keyboard.The duty of detector and used probe pass through keyboard to set up by the user, detected telluric electricity field signal enters impedance inverter circuit by X and Y end, signal after the conversion is regulated through range, amplify, send the in-phase input end P1.0 of the interior comparer of sheet of single-chip microcomputer behind trap and the frequency selection circuit, the output terminal of comparer is P3.6 in the sheet, when the level of P3.6 by high tumble when low, the setting value of the amplitude of detection signal less than digital potentiometer (POT0 of IC6 and POT1) is described, regulate digital potentiometer (promptly changing the comparing voltage value of comparer inverting input in the sheet) by P1.5 and P1.6 like this, the level of P3.6 is uprised by low, single-chip microcomputer is read the digitized positions of POT0 and two the digital potentiometer sliding ends of POT1 of IC6 by P1.5 and P1.6, promptly know the comparative voltage before and after the comparer upset in the sheet, make the amplitude that can calculate detection signal easily.If there is multidate information to occur, when needing to detect its frequency, can be by the method in the scheme two, with the intermediate value of signal amplitude in the base value that comparer is set, the pulse number that regularly detects P3.6 output can be measured the frequency of telluric electricity field signal, each testing result deposits the serial storage of IC11-IC16 automatically in, upperly can read testing result analysis, calculate by the RS-232 mouth, make the water conducted zone distribution plan, multidate information figure etc., if be used for water detection, also can calculate well location, well depth and Cheng Jing and dope reference datas such as the water yield.Instrument can also be measured under the monitoring of upper PC, and this uses the laptop computer measurement to be highly profitable to the field; Under this duty, show an information on the LCM LCD of instrument, other operation and the parameter of instrument are controlled or are provided with by keyboard by host computer; Measurement data is no longer sent the serial storage of instrument, but directly deposits in document format data in the hard disk or flexible plastic disc of upper PC; Measure and finish, host computer just can be made water conducted zone distribution plan or multidate information figure as required and be calculated other needed data.

This detector adopts Intelligentized method to the measurement of static information and multidate information, and it can change long interval sampling of sampling period automatically to static information, to multidate information high-speed sampling then, has guaranteed the accuracy of measurement data.Figure 6 shows that the magnetic fluid detector records the figure of the face of land actual electric field branch in somewhere, during measurement, by Fig. 7 12 probes that X organizes and Y organizes are divided into 6 to (X0Y0, X1Y1, X2Y2, X3Y3, X4Y4, X5Y5), the pole span of every pair of probe is all decided 5 meters, instrument is operated in touring detection mode, detects 6 pairs of pairing 6 check points of probe are touring.When band connection frequency was f1, the telluric electricity field amplitude of detection was respectively: A1, B1, C1, D1, E1, F1; When band connection frequency was f2, the telluric electricity field amplitude of detection was respectively A2, B2, C2, D2, E2, F2; When band connection frequency is f3, detect A3, B3, C3, D3, E3, F3; Find that in touring the detection value of D1 is cyclical variation, at this moment the band connection frequency with instrument is decided to be f1, adopt the method for " Leapfrog type " traveling probe further to measure between X3 in Fig. 7 and the Y3, find that only multidate information appears in the M place in Fig. 7, change measuring method, measure the frequency F of this place's multidate information; Measure so far.All decide well by common geophysical prospecting method at A, C, D three places, fix on which place actually entirely with exponent and subjective experience.In the method, we adopt static information and the principle that dynamically combines, (reason is: though A, C, D three places are low resistance state due to the M place with well location, but may be that factor such as silt, hydrostatic between the rock stratum or in the water conducted zone causes, there is multidate information in the M place, and showing in this zone of fracture is more deeply having the Groundwater Flow system).The face of land electric field branch figure of Fig. 6 for recording by three kinds of different frequencies, M place only has the multidate information appearance in frequency during for f1 as seen from Figure 6, according to the penetration capacity of electromagnetic wave in different objects, can estimate drilling depth by aforesaid formula; The Changing Pattern of the frequency F of multidate information reflection Groundwater Flow system is used to analyze and decides the well quality.

Claims (4)

1, a kind of underground magnetofluid to search water detection method may further comprise the steps:

With probe in detecting mt field information, regulate and amplifying circuit carries out delivering to the variable frequency selection network of centre frequency after signal amplifies through impedance inverter circuit and range;

The variable frequency selection network of centre frequency detects the nagneto-telluric field static information and the multidate information of different frequency, extracts the wherein amplitude and the frequency of multidate information, and the feed signals treatment circuit handles, by this amplitude and frequency qualitative analysis groundwater flow size;

Determine that by static information water conducted zone distributes;

Determine well depth by frequency-selecting frequency f and formation resistivity ρ $h=969.5\sqrt{\frac{p}{f}}.$

2, a kind of underground magnetofluid to search water detector, comprise probe, impedance inverter circuit (1), range adjusting and amplifying circuit (2), the variable frequency selection network of centre frequency (3), signal Processing and display circuit (4), it is characterized in that: field effect transistor BG1 and outer meeting resistance, electric capacity constitute impedance inverter circuit (1); Triode (BG2), operational amplifier (IC3A), adjustable resistor (W1) constitute range to be regulated and amplifying circuit (2); Double-T shaped filtering circuit, electronic switch (IC1, IC2, IC4), operational amplifier (IC3B, IC3C) and outer meeting resistance, electric capacity that resistance, electric capacity constitute are formed the variable frequency selection network of centre frequency (3); Diode (D1-D6), operational amplifier (IC3D), direct current milivoltmeter (MV) constitute signal Processing and display circuit (4).

3, a kind of underground magnetofluid to search water detector, comprise probe, impedance inverter circuit (1), range adjusting and amplifying circuit (2), the variable frequency selection network of centre frequency (3), signal Processing and display circuit (4), it is characterized in that: digital potentiometer (IC1, IC2), comparer (IC3, IC4), single-chip microcomputer (IC5) constitute the variable frequency selection network of centre frequency (3); Chip for driving (IC6), charactron, serial storage (IC8-IC15) and single-chip microcomputer constitute signal Processing and display circuit (4).

4, a kind of underground magnetofluid to search water detector, comprise probe, impedance inverter circuit (1), range adjusting and amplifying circuit (2), the variable frequency selection network of centre frequency (3), signal Processing and display circuit (4), it is characterized in that: electronic switch (IC1, IC2), field effect transistor (BG1), resistance, electric capacity constitute impedance inverter circuit (1); Four numerical control current potentials (IC6), four computing circuits (IC4) constitute range to be regulated and amplifying circuit (2); Four digital potentiometers (IC5, IC6), single-chip microcomputer (IC8) constitute the variable frequency selection network of centre frequency (3); Signal Processing and display circuit (4) that LCDs (SMS1204), serial storage (IC11-IC16), communication interface (IC9), single chip circuit constitute.

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