CN204442294U - A kind of mining focusing dual-frequency IP instrument chopper amplification circuit - Google Patents
A kind of mining focusing dual-frequency IP instrument chopper amplification circuit Download PDFInfo
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- CN204442294U CN204442294U CN201520245563.7U CN201520245563U CN204442294U CN 204442294 U CN204442294 U CN 204442294U CN 201520245563 U CN201520245563 U CN 201520245563U CN 204442294 U CN204442294 U CN 204442294U
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Abstract
The utility model discloses a kind of mining focusing dual-frequency IP instrument chopper amplification circuit, it is characterized in that, by frequency selection circuit, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter composition, described frequency selection circuit realizes the High-frequency and low-frequency bandpass filtering of regulable center frequency to input signal, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter connect respectively in turn, high-frequency modulation signal provides modulation reference signals for high-frequency modulator and demodulator, low-frequency modulation signal provides modulation reference signals for low frequency modulations device and demodulator.Utilize the utility model, the effective amplification to faint Dual-frequency Ip Method voltage signal can be realized.
Description
Technical field
The utility model relates to a kind of chopper amplification circuit for electrical prospecting, particularly relates to a kind of chopper amplification circuit of the sharp piezoelectric voltage signal that can be used in mining focusing dual-frequency IP instrument.
Background technology
For ensureing the safety in production of personnel and machinery equipment in coal mine work area, the principle of " prediction has pick to visit, first visits and dig afterwards, first controls and adopt afterwards " in tunneling process, must be followed.Along with the development of China's Mechanion level, require more and more higher to fully mechanized workface Detection Techniques.At present, the Roadway Leading Prospecting method that underground coal mine is conventional mainly comprises: the Detection Techniques such as mine direct current method, Mine Transient Electromagnetic Method, underground geological radar probe method, Rayleigh waves method and mine seismic wave 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 in these geophysical prospecting method, 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, can be significant with the forward probe method of development machine work compound.
Focusing on Dual-frequency Ip Method law technology (patent No. CN103176214A) is that pick forward probe new method combined by a kind of coal road based on bidifly electrical method and static focusing theory that China Mining Univ. (Beijing) proposes, and have developed mining focusing dual-frequency IP instrument according to focusing Dual-frequency Ip Method ratio juris.Instrument comprises emitter and receiving system two parts, emitter is identical to excavated section front transmitting amplitude by main electrode (being arranged in excavated section center), the modulated square wave electric current of low-and high-frequency combination is excitation, constraint electrode (being arranged symmetrically in main electrode surrounding) is launched identical with main electrode polarity, the modulated square wave electric current that intensity is adjustable is constraint, utilize constraint and the deflecting action of electric field, effective transmit direction and transmitting boundary controlling detection electric field, drift section front surrounding rocks is made to produce induced polarization in various degree in a certain orientation, faint sharp telecommunications breath low-and high-frequency potential difference is detected by receiving system, Swing frequency and apparent resistivity are looked in calculating, realizing drift section front the abnormal geological structure (comprises moisture, tomography and karst collapse col umn geological structure etc.) the accurate judgement of direction and distance.
The low-and high-frequency hybrid modulation square wave current that mining focusing dual-frequency IP instrument emitter is launched has four class frequency pair: 1Hz and 1/13Hz, 2Hz and 2/13Hz, 4Hz and 4/13Hz, 8Hz and 8/13Hz, the sharp piezoelectric voltage signal received by receiving system is faint low frequency or ultra-low frequency signal, for such signal, for effectively suppressing imbalance in amplification process and noise, improve induced-polarization measurement precision, be applicable to adopting chopper amplification technology effectively to amplify signal.
Utility model content
The purpose of this utility model is, solves effective scale-up problem that the faint low frequency of mining focusing dual-frequency IP instrument swashs piezoelectric voltage signal, realizes the high precision test of instrument to sharp piezoelectric voltage signal.
The utility model is achieved through the following technical solutions:
A kind of mining focusing dual-frequency IP instrument chopper amplification circuit, it is characterized in that, by frequency selection circuit, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter composition, described frequency selection circuit realizes the High-frequency and low-frequency bandpass filtering of regulable center frequency to input signal, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter connect respectively in turn, high-frequency modulation signal provides modulation reference signals for high-frequency modulator and demodulator, low-frequency modulation signal provides modulation reference signals for low frequency modulations device and demodulator.
The utility model is mining focusing dual-frequency IP instrument chopper amplification circuit compared with prior art, has following beneficial effect:
(1) modem chip AD630 is selected in chopping modulation and demodulation, has high integration and high-precision feature;
(2) bandpass amplifier selected by signal amplifier, realizes the suppression to high-frequency noise and interference while rejective amplifier DC maladjustment.
Accompanying drawing explanation
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the structure chart of the utility model frequency selection circuit;
Fig. 3 is the circuit diagram of the utility model modulator and demodulator.
Wherein, 1, frequency selection circuit, 2, high-frequency modulator, 3, low frequency modulations device, 4, high-frequency band pass amplifier, 5, low frequency bandpass amplifier, 6, rectifier, 7, low frequency demodulator, 8, high frequency low pass filter, 9, low frequency low pass filter.
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 range.
Referring to Fig. 1
Mining focusing dual-frequency IP instrument chopper amplification circuit described in the present embodiment, it is characterized in that, by frequency selection circuit (1), high-frequency modulator (2) and low frequency modulations device (3), high-frequency band pass amplifier (4) and low frequency bandpass amplifier (5), rectifier (6) and low frequency demodulator (7), high frequency low pass filter (8) and low frequency low pass filter (9) composition, described frequency selection circuit (1) realizes the High-frequency and low-frequency bandpass filtering of regulable center frequency to input signal, high-frequency modulator (2) and low frequency modulations device (3), high-frequency band pass amplifier (4) and low frequency bandpass amplifier (5), rectifier (6) and low frequency demodulator (7), high frequency low pass filter (8) and low frequency low pass filter (9) connect respectively in turn, high-frequency modulation signal is that high-frequency modulator (2) and rectifier (6) provide modulation reference signals, low-frequency modulation signal is that low frequency modulations device (3) and low frequency demodulator (7) provide modulation reference signals.
Referring to Fig. 2
Described frequency selection circuit (1) comprises control circuit and filter circuit, and control circuit comprises single-chip microcomputer and multiway analog switch.Single-chip microcomputer produces control signal according to the frequency of input signal, the gating and the choosing that control multiway analog switch are disconnected, for first couple of frequency 1Hz and 1/13Hz, analog switch first via gating, other three tunnels turn off, now signal is the band pass filter of 1Hz and 1/13Hz respectively through centre frequency, thus realizes the filter action to harmonic wave and other frequency interferences signals, obtains the sine voltage signal that frequency is 1Hz and 1/13Hz respectively.
Referring to Fig. 3
Described low frequency modulations device (3) and low frequency demodulator (7) are as shown in circuit diagram U1, high-frequency modulator (2) and rectifier (6) are as shown in U3 in circuit diagram, modulator is identical with demodulator circuit structure, single-chip microcomputer produces high-frequency square-wave signal HCLK and low-frequency square-wave signal LCLK, by comparing with reference voltage 2.5V in comparator LM393, produce high-frequency modulation signal HREF and low-frequency modulation signal LREF respectively, high-frequency modulation signal HREF is that high-frequency modulator (2) and rectifier (6) provide modulation reference signals, set of frequency is 1000Hz, low-frequency modulation signal LREF is that low frequency modulations device (3) and low frequency demodulator (7) provide modulation reference signals, set of frequency is 100Hz.
Described high-frequency band pass amplifier (4) centre frequency is set to 4Hz, bandwidth is set to 50Hz, low frequency bandpass amplifier (5) centre frequency is set to 4/13Hz, bandwidth is set to 5Hz, high-frequency band pass amplifier (4) is all set to 1000 times with the gain of low frequency bandpass amplifier (5), and amplifier chip selects zero shift low noise operational amplifier chip.
Described high frequency low pass filter (8) cut-off frequency arranges 100Hz, the rate of decay is-40dB/dec, low frequency low pass filter (9) cut-off frequency arranges 10Hz, and the rate of decay is-40dB/dec, operational amplifier chip selection zero shift low noise operational amplifier chip.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification 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. a mining focusing dual-frequency IP instrument chopper amplification circuit, it is characterized in that, by frequency selection circuit, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter composition, described frequency selection circuit realizes the High-frequency and low-frequency bandpass filtering of regulable center frequency to input signal, high frequency and low frequency modulations device, high frequency and low frequency bandpass amplifier, high frequency and low frequency demodulator, high frequency and low frequency low pass filter connect respectively in turn, high-frequency modulation signal provides modulation reference signals for high-frequency modulator and demodulator, low-frequency modulation signal provides modulation reference signals for low frequency modulations device and demodulator.
2. mining focusing dual-frequency IP instrument chopper amplification circuit according to claim 1, it is characterized in that, the centre frequency of described frequency selection circuit high-frequency band pass filtering can be set to 1Hz, 2Hz, 4Hz and 8Hz, and the centre frequency of low-frequency band pass filter can be set to 1/13Hz, 2/13Hz, 4/13Hz, 8/13Hz.
3. mining focusing dual-frequency IP instrument chopper amplification circuit according to claim 1, it is characterized in that, modem chip AD630 selected by described high frequency and low frequency modulations device, high frequency and low frequency demodulator.
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| CN201520245563.7U CN204442294U (en) | 2015-04-22 | 2015-04-22 | A kind of mining focusing dual-frequency IP instrument chopper amplification circuit |
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| CN201520245563.7U CN204442294U (en) | 2015-04-22 | 2015-04-22 | A kind of mining focusing dual-frequency IP instrument chopper amplification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255691A (en) * | 2020-11-09 | 2021-01-22 | 高军 | Method for detecting deep fracture geology by induced polarization composite frequency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255691A (en) * | 2020-11-09 | 2021-01-22 | 高军 | Method for detecting deep fracture geology by induced polarization composite frequency |
| CN112255691B (en) * | 2020-11-09 | 2024-02-02 | 高军 | Deep fracture geological method for detecting excitation composite frequency |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20160422 |