CN204650191U - A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method - Google Patents
A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method Download PDFInfo
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- CN204650191U CN204650191U CN201520164684.9U CN201520164684U CN204650191U CN 204650191 U CN204650191 U CN 204650191U CN 201520164684 U CN201520164684 U CN 201520164684U CN 204650191 U CN204650191 U CN 204650191U
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Abstract
The utility model discloses a kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method, it is characterized in that, comprise control tape bandpass filter circuit 1, high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 and 7, high frequency reference signal circuit 3 and low frequency reference signal circuit 6, high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11, described control tape bandpass filter circuit 1 realizes high frequency to input signal and low-frequency band pass filter respectively under Single-chip Controlling, signal after bandpass filtering respectively with high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 with 7 input signal end be connected, its reference signal end is connected with high frequency reference signal circuit 3 and low frequency reference signal circuit 6 respectively, signal after phase sensitive detection is respectively through high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11 exports.Utilize the utility model, can realize detecting the high-precise synchronization of Dual-frequency Ip Method signal amplitude and phase place.
Description
Technical field
The utility model relates to a kind of phase-sensitive detection circuit for resistivity prospecting, particularly relates to a kind of phase-sensitive detection circuit that can be used for the sharp piezoelectric voltage signal focused in double-frequency induced polarization method instrument.
Background technology
The mechanization degree of China's coal-mine mining method strengthens gradually, requires more and more higher to the work efficiency of fully mechanized workface.The principle of " prediction has pick to visit, first visits and dig afterwards, first controls and adopt afterwards " must be followed in tunneling process, ensure the safety in production of personnel and machine in workplace.At present, coal mine down-hole tunnel forward probe method comprises mine direct current method, Mine Transient Electromagnetic Method, underground geological radar probe method, Rayleigh waves method and mine seismic wave advanced detection technology etc.There are the following problems for these geophysical prospecting method: there is the outstanding problems such as detection accuracy rate is low, poor real, directivity are poor, efficiency is low, cost is high, poor anti jamming capability, spy pick separation, can not meet the requirement of development end to forward probe completely.Therefore, study that a kind of method of work is simple, detection accuracy is high, it is significant to realize with the forward probe method of development machine work compound.
Focusing on double-frequency induced polarization method (patent No. CN103176214A) is a kind of Advance Detection of Coal Roadway method based on bidifly electrical method and static focusing effect that China Mining Univ. (Beijing) proposes, according to the character that same sex electric field repels mutually, the detection electric field utilizing the constrained electric field of constraint electrode emission and central electrode to launch interacts, utilize constraint and the deflecting action of electric field, the direction of propagation of effective control electric field, the transmit direction of detection electric field and transmitting boundary are controlled within the specific limits, thus realize angle and depth scan detection, reach anomalous body and determine direction, the object of set a distance detection.
In focusing double-frequency induced polarization method, the extraction of Dual-frequency Ip Method voltage signal magnitude and phase place is gordian technique wherein.Central South University (patent No. CN1034276) proposes to utilize the fourier transform device that is concerned with to extract high frequency real component, high frequency imaginary component, low frequency real component, low frequency imaginary component from amplification and filtered sharp electric signal, and the subject matter of existence is the impact that the precision of coherent detection is subject to bandwidth-limited circuit.
Utility model content
The purpose of this utility model is, overcomes the above-mentioned defect of existing dual-frequency IP instrument, provides a kind of antijamming capability strong, high-precision phase-sensitive detection circuit.
The utility model is achieved through the following technical solutions:
A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method, it is characterized in that, comprise control tape bandpass filter circuit 1, high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 and 7, high frequency reference signal circuit 3 and low frequency reference signal circuit 6, high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11, described control tape bandpass filter circuit 1 realizes high frequency to input signal and low-frequency band pass filter respectively under Single-chip Controlling, signal after bandpass filtering respectively with high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 with 7 input signal end be connected, its reference signal end is connected with high frequency reference signal circuit 3 and low frequency reference signal circuit 6 respectively, signal after phase sensitive detection is respectively through high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11 exports.
The utility model, for focusing on the phase-sensitive detection circuit of double-frequency induced polarization method compared with prior art, has following beneficial effect:
1. the utility model has the feature of modularization, integrated, low-power consumption;
2. the utility model adopts control tape bandpass filter circuit, eliminates the error that electric capacity, resistance error and drift cause;
3. the utility model adopts the mode of reaction type ultralow frequency low-pass filter circuit to realize integration, solves large time constant Integral Problem.
Accompanying drawing explanation
A kind of double frequency resultant current waveform schematic diagram that Fig. 1 (a) is exciting current waveform in existing induced-polarization measurement;
Fig. 1 (b) is two-color excitation polarized signal waveform schematic diagram a kind of in existing induced-polarization measurement;
Fig. 2 is the utility model structured flowchart;
Fig. 3 is the circuit diagram of the utility model control tape bandpass filter circuit;
Fig. 4 is the circuit diagram of the utility model high frequency reference signal circuit;
Fig. 5 is the circuit diagram of the utility model low frequency reference signal circuit;
Fig. 6 is the circuit diagram of the utility model low frequency phase-sensitive detection circuit and low frequency integrating circuit;
Fig. 7 is the circuit diagram of the utility model low frequency phase-sensitive detection circuit and low frequency integrating circuit;
Fig. 8 is the circuit diagram of the utility model high frequency phase-sensitive detection circuit and high-frequency integration circuit;
Fig. 9 is the circuit diagram of the utility model high frequency phase-sensitive detection circuit and high-frequency integration circuit.
Wherein, 1. control tape bandpass filter circuit, 2. high frequency phase-sensitive detection circuit I, 3. high frequency reference signal circuit, 4. high frequency phase-sensitive detection circuit, 5. low frequency phase-sensitive detection circuit, 6. low frequency reference signal circuit, 7. low frequency phase-sensitive detection circuit, 8. high-frequency integration circuit, 9. high-frequency integration circuit, 10. low frequency integrating circuit, 11. low frequency integrating circuit.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect and be easy to understand and understand, below in conjunction with drawings and Examples, the utility model is described further.The present embodiment must not be used for explaining the restriction to the utility model protection domain.
Referring to Fig. 1,2
Fig. 1 (a) and (b) are respectively a kind of double frequency resultant current waveform, the two-color excitation polarized signal waveform schematic diagram of exciting current waveform in existing induced-polarization measurement, its medium frequency is to being respectively 1 and 1/13Hz, 2 and 2/13Hz, 4 and 4/13Hz, 8 and 8/13Hz, and the object of phase-sensitive detection circuit extracts amplitude and the phase information of first-harmonic in two-color excitation polarized signal.
The phase-sensitive detection circuit for focusing on double-frequency induced polarization method described in the present embodiment, it is characterized in that, comprise control tape bandpass filter circuit 1, high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 and 7, high frequency reference signal circuit 3 and low frequency reference signal circuit 6, high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11, described control tape bandpass filter circuit 1 realizes high frequency to input signal and low-frequency band pass filter respectively under Single-chip Controlling, signal after bandpass filtering respectively with high frequency phase-sensitive detection circuit 2 and 4, low frequency phase-sensitive detection circuit 5 with 7 input signal end be connected, its reference signal end is connected with high frequency reference signal circuit 3 and low frequency reference signal circuit 6 respectively, signal after phase sensitive detection is respectively through high-frequency integration circuit 8 and 9, low frequency integrating circuit 10 and 11 exports.
Referring to Fig. 3
Described control tape bandpass filter circuit 1 comprises control tape pass filter chip MAX260 and latch chip 74HC374, MAX260 are the two second order universal switch active filters of CMOS that MAXIM company releases, and microprocessor accurately controls filter function.When not needing outer member, just can form that various band is logical, the configuration of low pass, high pass, trap and all-pass.Centre frequency f can be set under program
0, quality factor q and wave filter working method.
Referring to Fig. 4 and Fig. 5
Described high frequency reference signal circuit 3 and low frequency reference signal circuit 6 are formed by twin voltage comparer chip LM393, the principle of work of high frequency reference signal circuit 3 is that digital controlled signal CLKH and 2.5V reference voltage V REF compare through LM393, produce the reference signal LIA_REFH1 needed for high frequency phase-sensitive detection circuit 2 and 4 and LIA_REFH2 respectively, the principle of work of low frequency reference signal circuit 6 is that digital controlled signal CLKL and 2.5V reference voltage V REF compare through LM393, produce reference signal LIA_REFL1 and the LIA_REFL2 of low frequency phase-sensitive detection circuit 5 and 7 needs respectively.
Referring to Fig. 6 and Fig. 7
Described low frequency phase-sensitive detection circuit 5 and 7 all adopts balance modem chip AD630, its input end is connected with control tape bandpass filter circuit 1, output terminal is connected with low frequency integrating circuit 10 and 11 respectively, input signal is BP_OUTL, reference signal is respectively LIA_REFL1 and LIA_REFL2, input signal and reference signal carry out multiplying in phase-sensitive detection circuit inside, produce the output signal containing fundamental voltage amplitude and phase information.
Described low frequency integrating circuit 10 and 11 adopts reaction type ultralow frequency low-pass filter, and this circuit time constant can reach hundreds of second, can as ultra-low frequency signal integrator.Frequency in circuit is respectively 1/13Hz, 2/13Hz, 4/13Hz, 8/13Hz, and the time constant of therefore getting integrating circuit is 130s, and in circuit, all resistance all adopts per mille high precision, low drifting resistance.
Referring to Fig. 8 and Fig. 9
Described high frequency phase-sensitive detection circuit 2 and 4 all adopts balance modem chip AD630, its input end is connected with control tape bandpass filter circuit 1, output terminal is connected with high-frequency integration circuit 8 and 9 respectively, input signal is BP_OUTH, reference signal is respectively LIA_REFH1 and LIA_REFH2, input signal and reference signal carry out multiplying in phase-sensitive detection circuit inside, produce the output signal containing fundamental voltage amplitude and phase information.
Described high-frequency integration circuit 8 and 9 adopts reaction type ultralow frequency low-pass filter, and this circuit time constant can reach hundreds of second, can as ultra-low frequency signal integrator.Higher frequency in circuit is respectively 1Hz, 2Hz, 4Hz, 8Hz, and the time constant of therefore getting integrating circuit is 10s, and in circuit, all resistance all adopts per mille high precision, low drifting resistance.
More than show and describe ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by claims and equivalent thereof.
Claims (3)
1. one kind for focusing on the phase-sensitive detection circuit of double-frequency induced polarization method, it is characterized in that, comprise control tape bandpass filter circuit (1), high frequency phase-sensitive detection circuit (2) (4), low frequency phase-sensitive detection circuit (5) (7), high frequency reference signal circuit (3) and low frequency reference signal circuit (6), high-frequency integration circuit (8) (9), low frequency integrating circuit (10) (11), described control tape bandpass filter circuit (1) realizes high frequency to input signal and low-frequency band pass filter respectively under Single-chip Controlling, signal after bandpass filtering respectively with high frequency phase-sensitive detection circuit (2) (4), the input signal end of low frequency phase-sensitive detection circuit (5) (7) connects, its reference signal end is connected with high frequency reference signal circuit (3) and low frequency reference signal circuit (6) respectively, signal after phase sensitive detection is respectively through high-frequency integration circuit (8) (9), low frequency integrating circuit (10) (11) export.
2. the phase-sensitive detection circuit for focusing on double-frequency induced polarization method according to claim 1, it is characterized in that, described control tape bandpass filter circuit (1) can realize under program to 1 and 1/13Hz, 2 and 2/13Hz, 4 and 4/13Hz, 8 and 8/13Hz frequency to the bandpass filtering of medium-high frequency and low frequency.
3. the phase-sensitive detection circuit for focusing on double-frequency induced polarization method according to claim 1, it is characterized in that, described high-frequency integration circuit (8) (9), low frequency integrating circuit (10) (11) adopt reaction type ultralow frequency low-pass filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520164684.9U CN204650191U (en) | 2015-03-23 | 2015-03-23 | A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520164684.9U CN204650191U (en) | 2015-03-23 | 2015-03-23 | A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method |
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| CN204650191U true CN204650191U (en) | 2015-09-16 |
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| CN201520164684.9U Expired - Fee Related CN204650191U (en) | 2015-03-23 | 2015-03-23 | A kind of phase-sensitive detection circuit for focusing on double-frequency induced polarization method |
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