CN102520451B - High-precision double-way ground voice frequency electromagnetic physical geography prospecting instrument - Google Patents
High-precision double-way ground voice frequency electromagnetic physical geography prospecting instrument Download PDFInfo
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- CN102520451B CN102520451B CN 201110454869 CN201110454869A CN102520451B CN 102520451 B CN102520451 B CN 102520451B CN 201110454869 CN201110454869 CN 201110454869 CN 201110454869 A CN201110454869 A CN 201110454869A CN 102520451 B CN102520451 B CN 102520451B
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Abstract
The invention provides a high-precision double-way ground voice frequency electromagnetic physical geography prospecting instrument, wherein an electrode of one way is connected with a power frequency restraining module, a primary amplifying module, a programming amplifying module and a frequency selection amplifying module sequentially, and then switched in a signal following and detection module; meanwhile an electromagnetic sensor of the other way is connected with a power frequency restraining module, a primary amplifying module, a programming amplifying module and a frequency selection amplifying module sequentially, and then switched in the signal following and detection module; the two ways are connected to respective AD acquisition modules respectively and switched in a main controller module jointly; and the main controller module is further respectively connected with a human-computer interface with a display and a keyboard, as well as data storage equipment. The instrument provided by the invention adopting a natural electromagnetic field of the ground as a prospecting field source, operates in a double-way manner, is energy-saving and environment-friendly, is suitable for the prospecting of various areas, completely guarantees the stability and accuracy of measuring data, is nondestructive in prospecting, is light, is quick in data collection and measurement, is simple and convenient to control, and has wide application range.
Description
Technical field
The present invention relates to the Detection Techniques field of International Classification of Patents G01V geophysics, material or object, especially high precision binary channels the earth audio-electromagnetically physical prospecting instrument.
Background technology
In the known technology, geophysical survey is called for short " physical prospecting ", namely constructs and solve the method for problem in the exploration prospecting with the principle geologize of physics.It is with the density of various rocks and ore, magnetic, electrically, differences of physical properties such as elasticity, radioactivity are the research basis, with different physical methods and geophysical prospecting equipment, survey the variation of natural or artificial geophysical field, by the physical prospecting data of analyzing, research institute obtains, infer, explain tectonic structure and distribution of mineral deposits situation.Main geophysical prospecting method has at present: gravity prospecting, magnetometer survey, resistivity prospecting, seismic prospecting, radiometric prospecting etc.Wherein, resistivity prospecting is according to rock and ore electrical properties, as electric conductivity, electrochemical activity, electromagnetic induction characteristic and dielectricity, i.e. and so-called " electrical property difference ", a kind of geophysical exploration method of looking for ore deposit and geologize to construct.It is by Instrument observation artificial, natural electric field or alternating electromagnetic field, analyzes, explains these characteristics and the rule purpose that reaches exploration prospecting.Resistivity prospecting is divided into two big classes.The researching DC electric field, be referred to as DC electrical method, include resistivity method, mise-a-la-masse method, natural electric field method and direct-current induced polarization method etc.; The research alternating electromagnetic field, be referred to as AC electrical method, include alternating induced polarization, electromagnetic method, nagneto-telluric field method, radio wave pentration method and microwave method etc.By the difference of workplace, resistivity prospecting is divided into electrical method in ground electrical method, tunnel and the well, aeroelectrical method, ocean electrical method etc. again.
Such as, audio-frequency electric magnetic method class prospecting instrument has that prospecting prime cost is low, efficient is high, depth of exploration is big, applied range, is not subjected to the advantage of high resistant geologic body poorly conductive and the shielding of low-resistance geologic body wherein bigly.
Correlation technique patent be disclose in the document less, for example:
Number of patent application 200910237810 relates to geophysical exploration technology, it is a kind of mt detection instrument method of evaluating performance, electric field is connected acquisition time sequence data 1 with the field signal input end with the signal ground end, input end with electric field and field signal inserts same signal again, acquisition time sequence data 2, carrying out power spectrum calculates, obtain sequence 1,2 each passage auto-power spectrum and cross-power spectrums, the related function that calculates any two passages according to auto-power spectrum and the cross-power spectrum of sequence 1 and 2, signal to noise ratio (S/N ratio), and noise power spectrum, determine MT instrument relevant interference and random noise.
Number of patent application 201020128870 relates to a kind of high density natural electric field frequency-selecting physical prospecting admeasuring apparatus of geophysical survey (abbreviation physical prospecting) surveying instrument.Comprise electrode group, electrode selection circuit, selective frequency amplifier circuit and controller.
In the prior art, generally need to make the exploration field source, need to consume more energy machine discharging, measure time-consuming very long, be subject to the shielding of low-resistance geologic body and the nonconducting influence of high resistant geologic body, seriously limited and used and promote, uncontrollable electric field frequency stability, the measurement data accuracy and the precision that make can't guarantee.
Summary of the invention
The purpose of this invention is to provide a kind of high precision binary channels the earth audio-electromagnetically physical prospecting instrument, this device can overcome above deficiency of the prior art.
Goal of the invention of the present invention realizes by following technical measures: a path electrode suppresses module with power frequency successively, the one-level amplification module, the programming amplification module is connected back access signal and follows and detection module with the frequency-selecting amplification module, simultaneously, another road electromagnetic sensor suppresses module with power frequency successively, the one-level amplification module, the programming amplification module is connected back access signal and follows and detection module with the frequency-selecting amplification module, connect respectively subsequently separately and insert main controller module jointly behind the AD acquisition module, and main controller module further connects man-machine interface and the data storage device that comprises demonstration and keyboard respectively.
The invention has the beneficial effects as follows: use the natural electromagnetic field of the earth as exploration field source, binary channels work, energy-conserving and environment-protective; Be suitable for the exploration in various areas, fully guaranteed stability and the accuracy of measurement data; Lossless detection, instrument is light, and data acquisition, measuring speed are fast, and instrument is light, controls simple and conveniently, and usable range is wide.
Description of drawings
Fig. 1 is principle of the invention block diagram
Fig. 2 is that the signal among the present invention amplifies the frequency selection network schematic diagram
Fig. 3 is the input acquisition principle figure among the present invention
Fig. 4 is the one-level amplifying circuit principle among the present invention
Fig. 5 is the secondary pga circuit principle among the present invention
Fig. 6 is the selective frequency filter circuit schematic diagram among the present invention
Embodiment
In the present invention, the principle of work that relates to also comprises, in conjunction with actual situation and the audio-frequency magnetotelluric magnetic method resistivity fundamental formular of using
ρ is apparent resistivity in the formula, and Ex is X-direction electric field intensity, and Hy is the magnetic field intensity perpendicular to X-direction; The electric field strength E x and the magnetic field intensity Hy that record certain frequency just can calculate apparent resistivity ρ; Be inversely proportional between frequency f and the apparent resistivity ρ, the relation of studying between it just reaches the purpose of studying different depth.Draw from formula and will calculate apparent resistivity ρ accurately, must guarantee the accuracy of frequency f, electric field strength E x and magnetic field intensity Hy, owing to natural electromagnetic field can change in time, so use two paths of signals to import simultaneously at electric field strength E x and magnetic field intensity Hy, when guaranteeing frequency accuracy, to guarantee that also Ex and Hy can simultaneously-measured consistance and accuracys.
The present invention amplifies network, Xin Haojiance ﹠amp by 2 road signal input parts, 2 road signal frequency-selectings; Follow, several parts such as the storage of master controller, data and man-machine interface form, wherein 2 road signal frequency-selectings amplification network importation partly is made up of one-level amplification, secondary programming amplification, frequency-selective filtering etc. respectively, adopt frequency selection network able to programme, start frequency selection network simultaneously by microcontroller, identical gain amplification, identical frequency rejection characteristic are set, thereby guarantee the frequency invariance of signals collecting.
Simultaneously, the present invention adopts the programmable data acquisition module, collection by microcontroller while log-on data testing circuit switch and data acquisition module, thereby guarantee the consistance of signals collecting time, and partly adopt the high-performance filtering chip to guarantee the stability of fixed-frequency at frequency-selective filtering, high performance 24 △-∑ A/D converter is realized feeble signal is efficiently changed, and uses high frequency CPU master controller by Xin Haojiance ﹠amp; Follow and start simultaneously and close, realize the man-machine interface of sampled measurements and hommization simultaneously.
2 road signal frequency-selectings are amplified the network importation and are added programmable 50HZ, the inhibition of 60HZ power frequency, partly adopt high performance detection chip to reach in 1% high-precision fixed-frequency error at frequency-selective filtering, complete machine has measuring accuracy height, survey frequency and time height consistance, the response frequency scope is wide, distinguishing features such as antijamming capability is strong, power frequency suppresses to be better than 90dB.
The present invention uses the natural electromagnetic field of the earth as the exploration field source, need not to consume the more energy and discharging, energy-conserving and environment-protective; Be not subjected to low-resistance geologic body shielding and the high resistant geologic body is nonconducting influences, be suitable for the exploration in various areas, solve and have the out of use shortcoming in instrument some areas now; Both guarantee the stability of fixed frequency, realized the frequency of two channel measurements and the height consistance of time simultaneously, fully guaranteed stability and the accuracy of measurement data; Lossless detection, instrument is light, and acquisition speed is fast, compares other DC electrical method quasi-instruments, and speed improves greatly, is guaranteeing that surveying accuracy requires to significantly improve measuring speed simultaneously, measuring speed even improve more than 10 times; Instrument is light, and man-machine interface is perfect, and is easy-to-understand, control simple and convenient, efficient rate is fast, data are accurate, energy-conserving and environment-protective, usable range is wide.
Below in conjunction with embodiment, further set forth the present invention.
Among the present invention, two paths of signals amplifies frequency selection network and connects signal input module, one-level amplification module, secondary amplification module able to programme and frequency-selecting amplification module successively, adopt frequency selection network able to programme, realize that signal amplifies frequency-selecting, start frequency selection network simultaneously by microcontroller, identical gain amplification, identical frequency rejection characteristic are set, thereby guarantee the frequency invariance of signals collecting.
Among the present invention, signal follows that work comprises with detection module, after the two paths of signals acquisition module connects separately signal detection module respectively, the common signal that inserts is followed module, adopt the programmable data acquisition module, by the collection of microcontroller while log-on data testing circuit switch and data acquisition module, thereby guarantee the consistance of signals collecting time.
Among the present invention, one-level amplification module circuit adopts active high-precision amplifying to realize the amplification of signal, and enlargement factor is: 20 times or 50 times; Wherein, adjust the adjustment of the resistance realization enlargement factor of RG.
Among the present invention, secondary amplification module circuit able to programme is according to the power of signal, and self-adaptation is switched corresponding enlargement factor, is divided into 4 enlargement factors, namely 1 times, 10 times, 100 times and 1000 times.
Among the present invention, the frequency-selecting amplification module comprises selective frequency filter circuit, wherein adopt the two second order universal switch electric capacity active filters of CMOS, by its accurate filtering function of microprocessor controls, its inside center frequency, Q value, mode of operation are set realize the frequency-selective filtering to signal, improve the precision of Detection of Weak Signals.
Claims (3)
1. high precision binary channels the earth audio-electromagnetically physical prospecting instrument, it is characterized in that: a path electrode suppresses module with power frequency successively, the one-level amplification module, the programming amplification module is connected back access signal and follows and detection module with the frequency-selecting amplification module, simultaneously, another road electromagnetic sensor suppresses module with power frequency successively, the one-level amplification module, the programming amplification module is connected back access signal and follows and detection module with the frequency-selecting amplification module, connect respectively subsequently separately and insert main controller module jointly behind the AD acquisition module, and main controller module further connects man-machine interface and the data storage device that comprises demonstration and keyboard respectively; Two paths of signals amplifies frequency selection network and connects signal input module, one-level amplification module, secondary amplification module able to programme and frequency-selecting amplification module successively, adopt frequency selection network able to programme, realize that signal amplifies frequency-selecting, start frequency selection network simultaneously by microcontroller, identical gain amplification, identical frequency rejection characteristic are set; Adopt the programmable data acquisition module, collection by microcontroller while log-on data testing circuit switch and data acquisition module, and partly adopt filtering chip to guarantee the stability of fixed-frequency at frequency-selective filtering, 24 delta sigma A/D converters realize the feeble signal conversion, use high frequency CPU master controller by Xin Haojiance ﹠amp; Follow and start simultaneously and close, realize sampled measurements simultaneously; 2 road signal frequency-selectings are amplified the network importation and are added programmable 50HZ, the inhibition of 60HZ power frequency; Described signal follows that work comprises with detection module, after the two paths of signals acquisition module connects separately signal detection module respectively, the common signal that inserts is followed module, adopts the programmable data acquisition module, by the collection of microcontroller while log-on data testing circuit switch and data acquisition module; Described frequency-selecting amplification module comprises selective frequency filter circuit, wherein adopt the two second order universal switch electric capacity active filters of CMOS, by its accurate filtering function of microprocessor controls, its inside center frequency, Q value, mode of operation are set realize the frequency-selective filtering to signal, improve the precision of Detection of Weak Signals.
2. high precision binary channels the earth audio-electromagnetically physical prospecting instrument as claimed in claim 1 is characterized in that, one-level amplification module circuit adopts activated amplifier to realize the amplification of signal, and enlargement factor is: 20 times or 50 times; Wherein, adjust the adjustment of the resistance realization enlargement factor of RG.
3. high precision binary channels the earth audio-electromagnetically physical prospecting instrument as claimed in claim 4, it is characterized in that secondary amplification module circuit able to programme is according to the power of signal, self-adaptation is switched corresponding enlargement factor, be divided into 4 enlargement factors, namely 1 times, 10 times, 100 times and 1000 times.
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| CN103149593A (en) * | 2013-01-29 | 2013-06-12 | 上海艾都能源科技有限公司 | Method and device for solving field source stability of natural electric field geophysical prospecting instrument |
| CN104007331B (en) * | 2013-02-21 | 2016-09-21 | 中国石油化工股份有限公司 | Device and method for collection analysis well site noise |
| CN103278853B (en) * | 2013-04-24 | 2016-02-17 | 中国科学院地质与地球物理研究所 | A kind of Single-channel ground electric-field instrument |
| CN105093339B (en) * | 2015-09-16 | 2018-06-19 | 吉林大学 | The magnetoelectricity integration conversion equipment and measuring method of high-density electric instrument |
| CN105158809B (en) * | 2015-09-18 | 2017-05-31 | 王玉喜 | A kind of mt double-decker array sweep-frequency Békésy audiometer frequency processing method and apparatus |
| CN105204074A (en) * | 2015-10-27 | 2015-12-30 | 中国矿业大学(北京) | Mining intrinsically-safe receiving system for electrical signals induced according to focusing double frequency induced polarization method |
| CN107422386A (en) * | 2017-04-20 | 2017-12-01 | 上海艾都能源科技有限公司 | A kind of intelligent electrical method physical prospecting instrument |
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| GB2415785B (en) * | 2004-07-02 | 2006-11-22 | Ohm Ltd | Electromagnetic surveying |
| CN201716425U (en) * | 2010-03-12 | 2011-01-19 | 韩荣波 | High-density natural electric field frequency selection and geophysical prospecting measuring apparatus |
| CN102062880A (en) * | 2009-11-11 | 2011-05-18 | 中国石油天然气集团公司 | Magnetotelluric instrument performance evaluation method |
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| US7872477B2 (en) * | 2007-04-30 | 2011-01-18 | Kjt Enterprises, Inc. | Multi-component marine electromagnetic signal acquisition cable and system |
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| SU1329412A1 (en) * | 1986-05-08 | 1991-07-30 | Всесоюзный Научно-Исследовательский Институт Геофизических Методов Разведки | Electric survey set |
| GB2415785B (en) * | 2004-07-02 | 2006-11-22 | Ohm Ltd | Electromagnetic surveying |
| CN102062880A (en) * | 2009-11-11 | 2011-05-18 | 中国石油天然气集团公司 | Magnetotelluric instrument performance evaluation method |
| CN201716425U (en) * | 2010-03-12 | 2011-01-19 | 韩荣波 | High-density natural electric field frequency selection and geophysical prospecting measuring apparatus |
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