CN201707445U - Mine disaster monitoring forecaster - Google Patents

Abstract

The utility model discloses a mine disaster monitoring forecaster. The mine disaster monitoring forecaster at least consists of an array sensor, a reference signal acquisition channel, an array signal acquisition channel, an A/D converter and a signal acquisition controller. The array signal acquisition channel consists of a multi-path electronic switch, a one-of-multiple logic control circuit, a preamplifier, a band pass filter, a frequency selecting amplifier, a frequency switching control circuit and a rectifier and amplifier circuit. The reference signal acquisition channel consists of a preamplifier, a band pass filter and a rectifier and amplifier circuit. The forecaster has the main characteristic that each unit signal output by the array sensor is subjected to frequency selecting receiving by using a frequency conversion mode so as to realize detection of an underground deep (0 to 3,072 meters) geologic body by using a remote measuring mode and provide convenient and effective monitoring measures for geological disasters possibly caused in underground mining.

Description

The mine disaster monitoring forecast instrument

Technical field

The utility model belongs to a kind of surveying instrument of earth electromagnetism variable, particularly a kind of mine disaster monitoring forecast instrument that utilizes the interior geologic body of natural electric magnetic wave field source detection face certain limit to be subjected to the terrestrial stress size and change.

Background technology

Angle from the underground change of stress field research tectonic earthquake and the mine disaster origin cause of formation, earthquake, mine disaster all are because the balanced system of underground stress is destroyed, and cause a series of geologic hazards that geologic body generation macroscopic motion or microscopic motion (rock or coal seam micro rupture take place, break for a short time or break greatly) back forms.Wherein mine disaster comprises that gas explosion, roof fall, pucking, rockfall, underground water are outstanding etc.Therefore, mine disaster has inseparable positive connection with earthquake.The applicant is at " earthquake monitor " of first to file, and the patent No. is ZL200610042816.6, and it utilizes the natural electric magnetic wave of eight directional flat capacitor sensor reception from eight orientation.According to piezoelectric effect, the focal area in tectonic stress in earlier stage, rock in the district is under the effect of terrestrial stress, with the electric field and the magnetic field that occur gathering, in the tectonic stress later stage, the rock in the focal area, underground deep is under the effect of terrestrial stress on the direction of principal compressive stress, begin to take place micro rupture, break for a short time, in this course, near the rock molecule the plane of fracture, the pulse electromagnetic wave that atom will produce 0～several million Hz, the precursor signal of Here it is generation earthquake and mine disaster.Generally speaking, the suffered principal compressive stress in focal area mainly is the horizontal stress field, the approximate 45 that is of pulse electromagnetic wave that in the focal area, produces thus and principal compressive stress, this pulse electromagnetic wave is when penetrating 5～20 kilometers geologic bodies arrival of earth's crust face of land, be about 45 with ground is approximate, therefore, eight directional flat capacitor sensor and ground are 45 can receive this ultra-low frequency natural electric magnetic wave pulse signal, after this signal is received by the flat capacitor sensor, can cause the disturbance of electronics in the sensor, its forcing frequency is identical with the pulse electromagnetic wave frequency.Therefore, instrument can detect this pulse electromagnetic wave with frequency selection method.In the whole nation or global range, set up numerous discrete websites with this earthquake monitor, and adopt the cross method of monitoring of multi-site measurement of bearing line of vector that net like monitoring (being called for short big area monitoring) is carried out in the whole nation or the whole world, promptly catch above-mentioned earthquake precursors signal with netted cover type, simultaneously using a plurality of folk prescriptions position earthquake monitor again (is exactly to make earthquake monitor with a flat capacitor sensor, and the angle of pitch and the direction of sensor are adjustable) (abbreviation area monitoring) monitored in above-mentioned line of vector joint zone simultaneously, promptly catch earthquake precursors signal in the above-mentioned joint zone simultaneously with the multiple spot radial inflow, therefrom determine the three elements of earthquake prediction, i.e. earthquake magnitude, origin time, send out the shake place.How Yu Bao method can referring to " forecasts the observation station around and earthquake in nearest seven days both at home and abroad " of being write by the Shaanxi People's Press publication in July, 2006, the applicant and Yang Wuyang particularly.Through practice for many years, the application of this earthquake monitor and use the monitoring method of this instrument to be tending towards ripe, it reaches about 60～70% the forecast success ratio in area.Because mine disaster is identical with the genesis mechanism of earthquake, only need in earthquake prediction, to analyze earthquake magnitude, destructive earthquake magnitude just can be judged as mine disaster inadequately, so in the forecast of above-mentioned earthquake, also carried out the forecast of domestic mine disaster simultaneously, also obtain good equally forecast success ratio, but this success ratio is with regard to area monitoring.That is to say that above-mentioned forecast is difficult to specific to being which ore deposit in this zone, so all genus wrong report of mine disaster takes place in the monitored area.

The utility model content

The purpose of this utility model is in order to solve above-mentioned wrong report problem, a kind of mine disaster monitoring forecast instrument is provided, monitored by the variation that the terrestrial stress effect takes place with it to the geologic body in the mining face under mine cube zone, monitoring result combines with big zone and area monitoring, thereby reaches the purpose of eliminating wrong report.

To achieve these goals, the technical solution of the utility model is as follows:

It is made up of sensor, a reference signal acquisition channel, array signal acquisition channel, A/D converter and a signal acquisition controller at least;

Described sensor is a three-dimensional array type natural electric magnetic wave sensor;

Described array signal acquisition channel comprises multi-channel electronic switch, prime amplifier, bandpass filter, frequency-selecting amplifier, the rectification amplifying circuit, the array detection signal of described sensor output is through the gating successively of multi-channel electronic switch, pass through prime amplifier again, band-pass filter amplifier is sent into frequency-selecting amplifier, the signal that frequency-selecting amplifier switches different frequency by frequency amplifies successively, again through the overcommutation amplifying circuit, A/D converter is sent into signal acquisition controller, the gating control signal that described signal acquisition controller is sent inserts the multi-channel electronic switch control end by multiselect one logic control circuit, and the frequency switch-over control signal that described signal acquisition controller is sent synchronously inserts the frequency switching controls end of frequency-selecting amplifier by the frequency control switching circuit;

Described reference signal acquisition channel is made up of prime amplifier, bandpass filter, rectification amplifying circuit, one road detectable signal of a certain specified sensor output is sent into A/D converter through prime amplifier, bandpass filter, rectification amplifying circuit in the described sensor, through sending into signal acquisition controller after the A/D conversion.

The utility model adopts three-dimensional array type natural electric magnetic wave sensor as acquisition sensor, it extend forward with the spherical crown surface radius and the three-dimensional probe angle that forms facing to method of working face zone, the mode of switching with multichannel each cell sensor signal in the gating sensor array successively then; According to the cut-off frequency formula of following the earth natural electric magnetic wave low frequency window as can be seen, the cutoff frequency f of natural electric magnetic wave is relevant with a certain geologic body lithologic interface place depth H:

$f=\frac{k\stackrel{\‾}{\mathrm{\ρ}}}{{(H+A)}^2}$

F is cutoff frequency (Hz) in the formula; Be the apparent resistivity (Ω m) of geologic body on a certain degree of depth, it is an accurate constant value, and this value can be revised through field survey according to the geologic body of different regions and slightly variant; H is a certain geologic body lithologic interface place degree of depth (m)), also can be to survey the air line distance of passing through rock; K is a constant (9.4 * 10 ⁵); A is the constant of determining after the field test (280 ±).This cut-off frequency formula comes from " Shun's opinion and the exploration of natural electric magnetic wave method " chapter 5 the 1st joint that the Shaanxi People's Press publication in November, 2002, Wang Wenxiang, Yang Wuyang write.

According to above-mentioned cut-off frequency formula, the receive frequency by changing signal can correspondence collects the natural electric magnetic wave signal of underground different depth (or different detection range).This instrument receives by the frequency-selecting that the signal to each road sensor output carries out frequency switching type, can collect the natural electric magnetic wave signal in the forward and backward three-dimensional zone of workplace.The signal gathered is through after the software processing, shows with the form of voltage waveform.Under the normal condition, the voltage signal of being monitored is comparatively steady, and when geologic body in the workplace zone changed (micro rupture, break for a short time even break greatly), train of impulses can appear in this voltage signal, Here it is mine disaster precursor signal that this instrument captures.If above-mentioned big area forecast and area forecast all provide the mine disaster forecast, judge that then this ore deposit the mine disaster internal cause takes place exists, can send forecast; If above-mentioned big zone and area forecast do not provide the mine disaster forecast, then can get rid of the possibility that mine disaster takes place.Characteristics of the present utility model are to have realized the detection of underground deep layer (0～3072 meter) geologic body with remote mode, for the mine disaster forecast provides convenience, effective monitoring means.

Frequency of the present utility model is switched and has been adopted large, medium and small three gears, and the corresponding distance of big retaining is 512 meters, and the corresponding distance of retaining is 32 meters in one, and the corresponding distance of little retaining is 1 meter.Its feature is to have realized the gear adjusting of big retaining by the conversion of a capacity cell in the frequency-selecting amplifier twin-T network, under each big retaining, the switching of middle retaining and little retaining can be general, therefore, not only simplified hardware configuration (multistage frequency-selecting amplifier promptly need not be set carry out the frequency switching), also made the switching controls of frequency also become simple simultaneously.

Description of drawings

Fig. 1, functional-block diagram of the present utility model.

The schematic diagram of Fig. 2, multi-channel electronic switch, multiselect one logic control circuit and prime amplifier.

The band of Fig. 3, two signal sampling channels is logical, the schematic diagram of rectification amplifying circuit.

The circuit theory diagrams of frequency-selecting amplifier in Fig. 4, the array signal acquisition channel.

The schematic diagram of Fig. 5, frequency-selecting amplifier frequency control switching circuit.

The circuit theory diagrams of Fig. 6, A/D converter and signal acquisition controller.

Fig. 7, monitoring view of the present utility model.

Embodiment

Referring to Fig. 1,7, described sensor 1 adopts existing three-dimensional array type natural electric magnetic wave sensor, and it has a spherical crown surface, array numerous flat capacitor sensors of having arranged on this spherical crown surface, and concrete structure is referring to Chinese patent ZL200620078323.3.During work, calculate the angle α on sensor 1 and ground 16 to the depth H of the horizontal range S of mining face under mine 17 and workplace, adjust sensor according to this angle α then, make the three-dimensional probe angle 18 of sensor 1 shroud the workplace zone according to sensor.Above-mentioned each flat capacitor sensor can become the natural electric magnetic wave conversion of signals that receives faint voltage signal output.The signal of each cell sensor output passes through multi-channel electronic switch in the sensor 1, array signal acquisition channel II (hereinafter to be referred as channel II) is sent on one tunnel one road ground gating successively, when every road signal is sent into, channel II will gather out with the detectable signal of different detection ranges by the frequency switching, that is to say the collection of electromagnetic wave signal in the forward and backward three-dimensional zone of the face of to finish the work.Simultaneously, specify the sensor of a cell sensor as the reference signal in sensor 1, the signal of its output is directly sent into reference signal acquisition channel I (being called for short channel I), thereby finishes the collection of reference signal.

Referring to Fig. 1,2, described channel II comprises multi-channel electronic switch 2, multiselect one logic control circuit 3 and prime amplifier 4, wherein multi-channel electronic switch 2 selects 1 electronic switch chip Y1～Y12 to constitute by 12 16, and described multiselect one logic control circuit 3 is made of a 4-12 code translator Y13; The output terminal of each cell sensor is not by each input end of connector J1～J4 and electronic switch chip Y1～Y12 join (for the purpose of drawing was clear, connecting line drew among the figure) in the described sensor 1; The output terminal out of described each electronic switch chip Y1～Y12 also is connected on the input end of prime amplifier 4, gating control end A0～A3 of described each electronic switch chip Y1～Y12 also is connected on four input pins of connector P1, the sheet of described each electronic switch chip Y1～Y12 choosing end CS joins with the decoding output terminal of 4-12 code translator Y13 respectively, and other four input pins of the decoding input end A5～A8 of this code translator Y13 and connector P1 join.

The gating control procedure of above-mentioned multi-channel electronic switch 2 is: export four binary-coded decimal A4～A7 (as: 0000～1100) that one group of increasing or decreasing changes by signal acquisition controller 14 by connector, through holding CS to be changed to high level the sheet choosing of each electronic switch chip Y1～Y12 successively after the decoding of 4-12 code translator, then chip Y1～Y12 is selected successively and work, when the selected work of each electronic switch chip, export four binary-coded decimal A0～A3 that another group increasing or decreasing changes by signal acquisition controller 14 by connector P1, then selected electronic switch chip, makes in the sensor 1 signal of corresponding unit sensor output send into prime amplifier 4 successively and amplifies 16 input ends gating successively according to the order of these four binary-coded decimal increasing or decreasings.When whenever sending into one road signal, signal acquisition controller 14 switches and sends into another road signal after needing the signals collecting of the different detection ranges in this road of wait to finish.

Described channel I comprises prime amplifier 10, and its input end joins by the plug-in pin of connector J4 and a cell sensor of appointment, and the input end of the output terminal of this cell sensor and prime amplifier 10 joins.The signal of described designating unit sensor output is through sending into subsequent conditioning circuit after the amplification of prime amplifier 10.The original contrast signal that this signal is used during as signal Processing.

The preposition amplification that above-mentioned channel I, II send (being that prime amplifier 4,10 is exported) signal is sent into subsequent conditioning circuit by connector S1.

Referring to Fig. 1,3, described channel I also comprises bandwidth-limited circuit 11 and rectification amplifying circuit 12, and they are by amplifying chip Y14, Y15, amplifier X1, being with logical amplification chip Y16, amplifier X2, rectification amplifier X3, amplifier X4, X5 to connect and compose; Described channel II also comprises bandwidth-limited circuit 5 and rectification amplifying circuit 8, and they are connected and composed by amplification chip Y17, Y18, Hi-pass filter Y19, low-pass filter Y20, amplifier X6, rectification amplifier X7, amplifier X8, X9.The frequency band that described channel II high pass and low-pass filtering are limited is chosen in the frequency range (0～several million Hz) of natural electric magnetic wave, its bandwidth should be greater than the pairing frequency range of detection range scope, the bandwidth of described signal I bandpass filtering is narrower, and the centre frequency of its bandwidth is the centre frequency of channel II bandwidth.

The band of the above-mentioned channel I course of work logical and that rectification is amplified is: the preposition amplification of described channel I (connector S1 sends into) signal is through amplifying chip Y14, Y15, send into bandpass filter Y16 after the amplification of amplifier X1, through bandpass filtering the natural electric magnetic wave signal of centre frequency is chosen out, since the natural electric magnetic wave signal very a little less than, so need multistage amplification and gain-adjusted, could satisfy of the requirement of follow-up A/D converter to input signal amplitude, therefore, the signal of bandpass filter Y16 output terminal becomes direct current through the amplification of amplifier X2 and rectification amplifier X3 again, and then through amplifier X4, the amplification of X5 is exported from connector S3.

The band of the above-mentioned channel II course of work logical and that rectification is amplified is: the preposition amplification of described channel II (connector S1 sends into) signal is through chip Y17, the amplification of Y18, again through the filtering of Hi-pass filter Y19 and low-pass filter Y20, the natural electric magnetic wave signal of a wideband section is chosen out, send into by connector S2 then and frequently select amplifier (concrete structure the following describes), switch through overfrequency, successively in face of the output services, the detectable signal of the different detection ranges in back, send back to the logical II of letter by connector S2 again then, pass through amplifier X6 more successively, rectification amplifier X3, amplifier X4, the rectification of X5 is amplified, and exports by connector S3.

Be made of an amplifier X10 and a negative feedback twin-T network circuit that is connected between amplifier negative input end and the output terminal referring to Fig. 1,4, described frequency-selecting amplifier 6, a T circuit in the described negative feedback twin-T network circuit is by two resistance in series R that are connected between amplifier negative input end and the output terminal ₁, R ₂Be connected on this two resistance in series R ₁, R ₂Capacitor C between series connection point and the ground ₃Constitute, its another T circuit is by being connected in parallel on resistance in series R ₁, R ₂Two series capacitance C at two ends ₁, C ₂Reach and be connected on this two series capacitance C ₁, C ₂Resistance R between series connection point and the ground ₃Constitute described resistance R ₂Constitute by regulating resistance R w, Rg series connection;

Described resistance R w is little retaining regulating element, and it is by a plurality of adjusting resistance With a multiselect one electronic switch U _RWConstitute described adjusting resistance

Computing formula be:

$R_w^J=\frac{{(240+J)}^4}{4{\mathrm{\π}}^2{R}_1^1}---\left(1\right)$

J=1 in the formula (1), 2,3 ... 32, resistance

Be R under the original frequency-selecting frequency of twin-T network circuit ₁Design load, determine the bandwidth of cut-off frequency frequency according to the distance range (generally being forward and backward 60 meters of work) of the required detection of this instrument, the lower limit of this bandwidth is exactly the original frequency-selecting frequency of this frequency-selecting amplifier, under this frequency-selecting frequency known case, R ₁The parameter calculation formula of available existing frequency-selecting amplifier is tried to achieve.Described little retaining has 32 gears, the span that gear is corresponding 1 meter.

Described resistance R ₁, Rg, R ₃And capacitor C ₁, C ₃Be middle retaining regulating element, the structure and parameter of each element is calculated as follows:

Retaining is regulated resistance R in described ₁By a plurality of unit resistances

With a multiselect one electronic switch U _R1Constitute, wherein resistance

Be R under the original frequency-selecting frequency of twin-T network circuit ₁Design load, resistance

Computing formula is:

$R_1^J=\frac{1}{4{\mathrm{\π}}^2-{\mathrm{\α}}_J}---\left(2\right)$

J=2 in the formula (2), 3,4 ... 16; α _JCalculate by following formula:

${\mathrm{\α}}_J=\frac{R_W^J}{{(240+J\·32)}^4-{(240+(J-1)\·32)}^4}---\left(3\right),$

J=2 in the formula (3), 3,4 ... 16;

Retaining is regulated resistance R g by a plurality of unit resistances in described With a multiselect one electronic switch U _RgConstitute, wherein resistance

Obtain by following formula:

${\mathrm{<figure-callout\; id="1"\; label="R\; g"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">R</figure-callout>}}_g^{}=\frac{240^4}{4{\mathrm{\&pi;}}^2{R}_1^1}---\left(4\right);$

Resistance

Try to achieve by following formula calculating:

$R_g^J=\frac{R_1^{J-1}\&CenterDot;R_2^{J-1}}{R_1^J}---\left(5\right)$

J=2 in the formula (5), 3,4 ... 16;

Obtain by formula (2);

By formula

(6) obtain: $R_2^{J-1}=\frac{{[240+32\&CenterDot;(J-1)]}^4}{4{\mathrm{\&pi;}}^2\&CenterDot;R_1^{J-1}}---\left(6\right);$

Retaining is regulated resistance R in described ₃With R ₁Structure identical, resistance

Resistance with Correspondent equal;

Retaining control capacittance C in described ₁By a plurality of specific capacitances With a multiselect one electronic switch U _C1Constitute, wherein

Be C under the original frequency-selecting frequency ₁Design load,

Computing formula be:

$C_1^J=\frac{{10}^{18}}{4{\mathrm{\&pi;}}^2\&CenterDot;R_1^J\&CenterDot;R_g^J\&CenterDot;C_2^J\&CenterDot;{\left({\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">f</figure-callout>}}_1^0\right)}^2}---\left(7\right)$

J=2 in the formula (7), 3,4 ... 16, Centre frequency for the cut-off frequency frequency bandwidth is calculated by following formula:

${\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">f</figure-callout>}}_1^0=\frac{{10}^6}{2\mathrm{\&pi;}\&CenterDot;\sqrt{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">R</figure-callout>}}_1^1\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="R\; g"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">R</figure-callout>}}_g^{}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="HSA00000117193500011.png,HSA00000117193500021.png"\; state="\{\{state\}\}">C</figure-callout>}}_1^1\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HSA00000117193500031.png,HSA00000117193500041.png"\; state="\{\{state\}\}">C</figure-callout>}}_2^1}}---\left(8\right)$

In the formula (8)

C under the original frequency-selecting frequency of twin-T network circuit ₂Design load;

Retaining is regulated resistance C in described ₃With C ₁Structure identical, electric capacity

The appearance value with Correspondent equal.

Retaining has 16 gears in described, and retaining regulating element R in described ₁, Rg, R ₃, C ₁, C ₃Carry out conversion simultaneously with following array mode:

1 retaining:

2 retainings:

3 retainings:

4 retainings:

5 retainings:

……………………

16 retainings:

Keep off the span of corresponding 32 meters of gear in one.

Described capacitor C ₂Be big retaining regulating element, it is by a plurality of specific capacitances

With a multiselect one electronic switch U _C2Connect and compose, wherein

Be C under the original frequency-selecting frequency of twin-T network circuit ₂Design load,

Computing formula be:

&lt;math>&lt;math display = 'block'><mrow><msubsup><mi>C</mi><mn>2</mn><mi>J</mi></msubsup><mo>=</mo><mfrac><msup><mn>10</mn><mn>18</mn></msup><mrow><mn>4</mn><msup><mi>&amp;pi;</mi><mn>2</mn></msup><mo>&amp;CenterDot;</mo><msubsup><mi>C</mi><mn>1</mn><mn>1</mn></msubsup><mo>&amp;CenterDot;</mo><msubsup><mi>R</mi><mn>1</mn><mn>1</mn></msubsup><mo>&amp;CenterDot;</mo><mrow><mo>(</mo><msubsup><mi>R</mi><mi>g</mi><mn>16</mn></msubsup><mo>&amp;plus;</mo><msubsup><mi>R</mi><mn>2</mn><mn>32</mn></msubsup><mo>)</mo></mrow><mo>&amp;CenterDot;</mo><msubsup><mi>f</mi><mn>0</mn><mi>J</mi></msubsup></mrow></mfrac>&lt;mtext>&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;&amp;nbsp;</mtext><mrow><mo>(</mo><mn>9</mn><mo>)</mo></mrow></mrow></math>

J=2 in the formula (9), 3,4 ... 10;

Be different frequency, it is calculated by following formula and tries to achieve:

&lt;math>&lt;math display = 'block'><mrow><msubsup><mi>f</mi><mn>0</mn><mi>J</mi></msubsup><mo>=</mo><mfrac><msup><mn>10</mn><mn>9</mn></msup><mrow><mn>2</mn><mi>&amp;pi;</mi><mo>&amp;CenterDot;</mo>&lt;msqrt><mrow><msubsup><mi>C</mi><mn>1</mn><mn>32</mn></msubsup><mo>&amp;CenterDot;</mo><msubsup><mi>C</mi><mn>2</mn><mrow><mi>J</mi><mo>&amp;minus;</mo><mn>1</mn></mrow></msubsup><mo>&amp;CenterDot;</mo><msubsup><mi>R</mi><mn>1</mn><mn>32</mn></msubsup><mo>&amp;CenterDot;</mo><msubsup><mi>R</mi><mn>2</mn><mn>32</mn></msubsup></mrow></msqrt></mrow></mfrac>&lt;mtext>&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;</mtext><mrow><mo>(</mo><mn>10</mn><mo>)</mo></mrow></mrow></math>

J=2 in the formula (10), 3,4,5,6;

The big retaining of this example is provided with 6 gears, a big span of keeping off corresponding 512 meters of gear, and 6 retainings are exactly 3072 meters, according to the increase of detection range, more gear can also be set.

The unit of above-mentioned each computing formula medium frequency f is Hz, capacitor C ₁Unit be microfarad, capacitor C ₂Unit is a picofarad, and the unit of resistance R is ohm.

Referring to Fig. 1,5, the multiselect one electronic switch U of described little retaining _RWSelect 1 electronic switch chip U by two 16 _RW1, U _RW2Form the multiselect one electronic switch U of described middle retaining _Rg, U _R1, U _C1, U _R3Select 1 electronic switch chip to constitute by one 16 respectively; The multiselect one electronic switch U of described big retaining _C2Select 1 electronic switch chip to constitute by one 16, their control end (A0～A3) join chip U by connector P2 and signal acquisition controller 14 (Fig. 6) _RW1, U _RW2The pin of end by a Sheffer stroke gate F1 and connector P2 that overflow join chip U _RgOverflow the pin of end by another Sheffer stroke gate F2 and connector P2 and join, connector P2 inserts signal acquisition controller 14.

The frequency switching controls process of above-mentioned frequency-selecting amplifier is: during work, the upper limit value and lower limit value of detection range is set by the man-machine interface of computing machine, as: the detection range of mining face under mine is 1385 meters, and we can be made as the lower limit of detection range 1321 meters, and higher limit is made as 1450 meters.By first control code that connector P2 output C organizes four bit code C0～C3, control big position switch chip U by signal acquisition controller 14 _C2Be changed to 3 retainings (1024～1536 meters), export first control code that B organizes four bit code B0～B3 again, position switch chip U in the control _Rg, U _R1, U _RW1, U _C1, U _R3Be changed to 10 retainings (288～320 meters) simultaneously, export first control code that A organizes four bit code A0～A3 again, control little position switch chip U _RW1Stop the beginning by 9 and switch to 16 retainings successively, then from chip U _RW2First stop the beginning and switch to 16 gears, in the meantime, gear of every switching promptly is to change frequently once, just corresponding detection range advances 1 meter, the one meter acquired signal of whenever advancing is (be A/D conversion back storage once) once; As little retaining chip U _RW1, U _RW216 the retaining by behind the gating, overflow high level of end EN output from it respectively, two high level signals are given signal acquisition controller 14 by low level reset signal of output behind the Sheffer stroke gate F1, after signal acquisition controller 14 is received this reset signal, output B organizes second control code of four bit code B0～B3, retaining increases 1 and switches once (promptly switching to 11 retainings from 10 retainings) in the control, and then output A organizes second control code of four bit codes A0～A3 sign indicating number, make little retaining keep off again again gating once from 1～32, so circulation, middle retaining increases 1 altogether and switches five times, switch to 14 retainings (416～448 meters) from 10 retainings always, and then control little retaining and increase 1 and switch once (1 meter), promptly finishing in 1321～1450 meters detection range scopes with rice is the detectable signal collection of unit.In the circuit, four middle position switch chip U _Rg, U _R1, U _C1, U _R3In of certain chip overflow end EN and another Sheffer stroke gate F2 joins, give signal acquisition controller 14 with retaining reset signal in this Sheffer stroke gate F2 output, after in signal acquisition controller 14 receives, keeping off reset signal, to control big retaining and increase 1 switching once, retaining restarts circulation from 1 retaining in making then, and this is used for the bigger situation of detection range scope.

Referring to Fig. 1,6, described signal acquisition controller 14 is made of a Single Chip Microcomputer (SCM) system, this Single Chip Microcomputer (SCM) system is by singlechip chip U1, data-carrier store chip U9, U10, data-interface chip U7, U8, geological storage device chip U2, U3, communication chip U4, logic encoder chip U5, data and geology code translator U11, U12, U13 connect and compose, and wherein have A/D converter 9 in the single-chip microcomputer U1.6-3 is the power supply stabilization circuit of this controller among the figure, and 6-4 is the reset circuit of singlechip chip, and P3 is the data connector of computing machine 15.

Channel I that sends by connector S3 and the rectification amplifying signal of channel II are sent into single-chip simulation signal input (P0 mouth) respectively, and single-chip microcomputer after this two paths of signals is carried out the A/D conversion is kept in data.In signal acquisition process, single-chip microcomputer is sent the gating control signal of multiselect one logic control circuit 3 and the frequency switching signal of frequency control switching circuit 7 according to program respectively by logic encoder chip 6-1.Simultaneously, Single Chip Microcomputer (SCM) system is given computing machine 15 by another logic encoder chip 6-2 with the channel I that gathered and the signal data of channel II under the control of computing machine 15, carry out data processing by computing machine, is reduced into voltage waveform signal then and shows.

Claims (2)

1. mine disaster monitoring forecast instrument is characterized in that:

It is made up of sensor (1), a reference signal acquisition channel (I), an array signal acquisition channel (II), A/D converter (9) and signal acquisition controller (14) at least;

Described sensor (1) is a three-dimensional array type natural electric magnetic wave sensor;

Described array signal acquisition channel (II) comprises multi-channel electronic switch (2), prime amplifier (4), bandpass filter (5), frequency-selecting amplifier (6), rectification amplifying circuit (8), the array detection signal of described sensor (1) output is through the gating successively of multi-channel electronic switch (2), again by prime amplifier (4), band-pass filter amplifier (5) is sent into frequency-selecting amplifier (6), the signal that frequency-selecting amplifier switches different frequency by frequency amplifies successively, again through overcommutation amplifying circuit (8), A/D converter (9) is sent into signal acquisition controller (14), the gating control signal that described signal acquisition controller (14) is sent inserts multi-channel electronic switch (2) control end by multiselect one logic control circuit (3), and the frequency switch-over control signal that described signal acquisition controller (14) is sent synchronously inserts the frequency switching controls end of frequency-selecting amplifier by frequency control switching circuit (7);

Described reference signal acquisition channel (I) is made up of prime amplifier (10), bandpass filter (11), rectification amplifying circuit (12), one road detectable signal of a certain specified sensor output is sent into A/D converter (9) through prime amplifier (10), bandpass filter (11), rectification amplifying circuit (12) in the described sensor (1), through sending into signal acquisition controller (14) after the A/D conversion.

2. mine disaster monitoring forecast instrument according to claim 1 is characterized in that:

Described frequency-selecting amplifier (6) is made of an amplifier (X10) and a negative feedback twin-T network circuit that is connected between this amplifier negative input end and the output terminal, and a T circuit in the described negative feedback twin-T network circuit is by two resistance in series R that are connected between amplifier (X10) negative input end and the output terminal ₁, R ₂Be connected on this two resistance in series R ₁, R ₂Capacitor C between series connection point and the ground ₃Constitute, its another T circuit is by being connected in parallel on resistance in series R ₁, R ₂Two series capacitance C at two ends ₁, C ₂Reach and be connected on two series capacitance C ₁, C ₂Resistance R between series connection point and the ground ₃Constitute described resistance R ₂Constitute by regulating resistance R w, Rg series connection;

Described resistance R w is little retaining regulating element, and it is by a plurality of adjusting resistance

With a multiselect one electronic switch U _RWConstitute described adjusting resistance

Computing formula be:

$R_w^J=\frac{{(240+J)}^4}{4{\mathrm{\&pi;}}^2{R}_1^1}......\left(1\right)$

J=1 in the formula (1), 2,3 ... 32, resistance

Be R under the original frequency-selecting frequency of twin-T network circuit ₁Design load;

Described resistance R ₁, Rg, R ₃And capacitor C ₁, C ₃Be middle retaining regulating element;

Retaining is regulated resistance R in described ₁By a plurality of unit resistances

With a multiselect one electronic switch U _R1Constitute, wherein resistance Be R under the original frequency-selecting frequency of twin-T network circuit ₁Design load, resistance

Computing formula is:

$R_1^J=\frac{1}{4{\mathrm{\&pi;}}^2-{\mathrm{\&alpha;}}_J}......\left(2\right)$

J=2 in the formula (2), 3,4 ... 16; α _JCalculate by following formula:

${\mathrm{\&alpha;}}_J=\frac{R_W^J}{{(240+J\&CenterDot;32)}^4-{(240+(J-1)\&CenterDot;32)}^4}......\left(3\right),$

J=2 in the formula (3), 3,4 ... 16;

Retaining is regulated resistance R g by a plurality of unit resistances in described

With a multiselect one electronic switch U _RgConstitute, wherein resistance

Obtain by following formula:

$R_g^1=\frac{{240}^4}{4{\mathrm{\&pi;}}^2{R}_1^1}......\left(4\right);$

Resistance

Try to achieve by following formula calculating:

$R_g^J=\frac{R_1^{J-1}\&CenterDot;R_2^{J-1}}{R_1^J}......\left(5\right)$

J=2 in the formula (5), 3,4 ... 16;

Obtain by formula (2);

Obtain by following formula:

$R_2^{J-1}=\frac{{[240+32\&CenterDot;(J-1)]}^4}{4{\mathrm{\&pi;}}^2\&CenterDot;R_1^{J-1}}......\left(6\right);$

Retaining is regulated resistance R in described ₃With R ₁Structure identical, resistance

Resistance with

Correspondent equal;

Retaining control capacittance C in described ₁By a plurality of specific capacitances

With a multiselect one electronic switch U _C1Constitute, wherein

Be C under the original frequency-selecting frequency ₁Design load,

Computing formula be:

$C_1^J=\frac{{10}^{18}}{4{\mathrm{\&pi;}}^2\&CenterDot;R_1^J\&CenterDot;R_g^J\&CenterDot;C_2^J\&CenterDot;{\left(f_1^0\right)}^2}......\left(7\right)$

J=2 in the formula (7), 3,4 ... 16,

Centre frequency for the cut-off frequency frequency bandwidth is calculated by following formula:

$f_1^0=\frac{{10}^6}{2\mathrm{\&pi;}\&CenterDot;\sqrt{R_1^1\&CenterDot;R_g^1\&CenterDot;C_1^1\&CenterDot;C_2^1}}......\left(8\right)$

In the formula (8) C under the original frequency-selecting frequency of twin-T network circuit ₂Design load;

Retaining is regulated resistance C in described ₃With C ₁Structure identical, electric capacity

The appearance value with

Correspondent equal;

Described capacitor C ₂Be big retaining regulating element, it is by a plurality of specific capacitances

With a multiselect one electronic switch U _C2Connect and compose, wherein

Be C under the original frequency-selecting frequency of twin-T network circuit ₂Design load,

Computing formula be:

$C_2^J=\frac{{10}^{18}}{4{\mathrm{\&pi;}}^2\&CenterDot;C_1^1\&CenterDot;R_1^1\&CenterDot;(R_g^{16}+R_w^{32})\&CenterDot;f_0^J}......\left(7\right)$

J=2 in the formula (7), 3,4 ... 10;

Be several frequencies, it is calculated by following formula and tries to achieve:

$f_0^J=\frac{{10}^9}{2\mathrm{\&pi;}\&CenterDot;\sqrt{C_1^{32}\&CenterDot;C_2^{J-1}\&CenterDot;R_1^{32}\&CenterDot;R_2^{32}}}......\left(8\right)$

J=2 in the formula (8), 3,4,5,6;

The unit of above-mentioned each computing formula medium frequency f is Hz, capacitor C ₁Unit be microfarad, capacitor C ₂Unit is a picofarad, and the unit of resistance R is ohm.

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