CN103383466A - Coal bed water radio measurement instrument - Google Patents

Abstract

A coal bed water radio measurement instrument is characterized in that the coal bed water radio measurement instrument comprises a double-channel low-frequency and ultralow-frequency radiometer and two double-antenna sets; according to the double-channel low-frequency and ultralow-frequency radiometer, a first channel is a DICK type broadband total-intensity radiometric receiver, the 3db bandwidth of the DICK type broadband total-intensity radiometric receiver is 500Hz-6.5MHz, a second channel is 16-channel scanning resonance type total-power radiometric receiver, and the center frequency of a 16-channel scanning resonance tank is 200Hz-1.05MHz; the two double-antenna sets are a plate type double-antenna set formed by a planar antenna and a ferrite antenna and a tube type double-antenna set formed by a helical antenna and a ferrite antenna; the coal bed water radio measurement instrument further comprises an A/D converter, a displayer recorder, an anti-explosion ni-mh rechargeable battery pack, a DC/DC converter circuit and a high-precision voltage-stabilized power source.

Description

A kind of coal seam water radio measuring instrument

Technical field

The present invention relates to a kind of measurement mechanism of coal seam water, especially relate to a kind of coal seam water radio measuring instrument, utilize the methods such as radio astronomy modulation, total power and absolute calibration in radioastronomy, by more accurately measuring radiation Strong degree, orientation and the length of normal in radio radiation source, (moisture) coal seam, how much can distinguish the coal seam water cut, and judge coal seam different parts underground water abundance etc.

Background technology

Coal accounts for 70% proportion in China's energy structure, and along with the increase of the colliery depth of excavation and the expansion of limit of mining, gas explosion, coal petrography are outstanding, the management task of top board slump, Mine Dust and mine groundwater is more and more heavier.List is prevented and treated with mine groundwater, although being arranged, the ground geophysical prospecting visits the ways and meanses such as water, tunnel electric-resistivity method survey water, but the former can only determine on the earth's surface underground reservoir Position Approximate, latter is difficult to detect out the water cut in the coal rock layer of Bian workplace the place ahead, thereby can not fundamentally solve the prediction problem of mine groundwater in the Bian coal process of colliery.

At present, mainly adopt following two kinds of methods for the measurement of coal seam water:

1, physical logging:

Utilize coal and water one to be liquid for solid one, different with electromagnetic reaction to seismic wave, several points are set on ground and by receiving the data of difference, nationality is to analyze and to measure the underground distribution situation of interior coal, rock, water on a large scale.The advantage of this method is in terrestrial operation, topped wide; Shortcoming is divided for being difficult to Fine.Can only be used for geologic prospecting on a large scale.

2, the resis tance method of surveying:

Utilize the coal resistivity different with water, place a series of probes in the boring of underground passage wall, by measuring the resistance between different boring point probes, nationality is to analyze and to measure the distribution situation of coal, water in the simple scope of wall.The advantage of this method is simple, shortcoming is complex operation (will bore tens to up to a hundred holes and measure respectively resistance between probe), (computational analysis afterwards of non-instantaneity, be difficult to the real time measure), and except the distribution situation of determining the simple scope coal of wall, water and among a small circle extrapolation, be difficult to obtain the particularly data of the place ahead, tunnel coal seam water of inspecting hole deep.The method is mainly used in fixed point inspection.

The normal physical characteristics of utilizing reception celestial radio radiation and radiation frequency spectrum analysis to measure remote celestial body in radioastronomy.The principle that radio radiation is measured is based on the Boltzmann theorem:

P=KT

Be ideal black-body under non-absolute zero, its radiation intensity P is proportional to its absolute temperature T, Boltzmann constant K=1.38 * 10-23W/Hz ° K;

For imperfect black matrix, P=σ KT, in formula, σ is emission ratio, 0≤σ≤1 is when σ=1 is ideal black-body.

The Boltzmann radiation covers whole electromagnetic wave spectrums, namely is radiated gamma Rays or shorter from myriameter waves.Therefore, determine the Boltzmann radiation intensity P of object and know its emission ratio σ, namely can determine the absolute temperature T of this testee.

(CN201010105756.4) such as yellow Fuquans proposed a kind of coal bed gas radio spectrum direction-finding early warning system, comprehensive, the hyperchannel of comprehensive utilization in Radio Astronomical Methods, high performance coal bed gas radio spectrum direction-finding system realizes the reception to five kinds of coal-bed gas radio radiation signals, measure and record its radiation temperature, relative intensity, the isoparametric variation of radiation frequency spectrum and form, nationality is with indirect determination coal-bed gas pressure, radial patterning and emission types thereof, determine its position, thereby instruct to produce, early warning is watt prominent.

Yet coal-bed gas has different physical propertys from glassware for drinking water, and one is that gas one is liquid, and gas is can be compressed, and liquid is hardly can be compressed; Compressed gas meets the space and will sharply expand, and the expansion of this methane gas causes coal petrography to ftracture and produces radio radiation just, and this radiation can have higher electron temperature and can reach larger intensity or form the spike radiation in moment; The convection current of liquid and conduction easily reach unanimously its temperature, thereby its radio radiation is a kind of gradual steady state of radiation in essence; Obviously, both radio radiations have significantly different characteristic.How to measure the radio radiation in moisture coal seam, and utilize the water in radio radiation analysis to measure coal seam, need to consider following factor: at first, there is the spike radiation hardly in the radio radiation of liquid; Secondly, the radiation intensity of coal seam water is lower than coal-bed gas radio radiation intensity, thereby needs higher complete machine gain, higher sensitivity, higher complete machine gain stability and more powerful integral performance; The 3rd, up to now not to the report of coal seam water radio radiation characteristic, for realizing measuring purpose have to greatly the expand frequency band range of reception, the f of full power system frequency acceptance band _max/ f _minExpand to 500 by 40, quantitative change causes qualitative change, thereby has increased difficulty widely; Comprise at last the change change with essence on the structure brought thus and circuit.

Measure for the radio of realizing coal seam water, the present invention is intended to redesign and develops a kind of coal seam radio ice detector.

Summary of the invention

The present invention seeks to as overcoming above-mentioned prior art existing weak point on coal seam water is measured, utilize the radioastronomy method, comprise the methods such as modulation in radio astronomy, total power and absolute calibration, a kind of coal seam water radio measuring instrument is provided, it is the coal seam water radio measuring and analysis system of the many sensing units of a kind of hyperchannel, by measuring coal seam water as the radiation temperature in radio radiation source, Strong degree and the parameters such as radiation source orientation and polarization relatively, nationality is with the orientation of measuring water enrichment region in coal rock layer and abundance etc.

The radio radiation that is different from coal-bed gas is measured, coal seam water radio is measured based on following principle: coal different with the water physical aspect (is that solid one is liquid), thereby except proportion, specific heat, acoustic propagation speed difference, at least also have 4 physical constants relevant from radio radiation different, and larger gap arranged:

Emission ratio σ is different, and coal is black object, therefore σ close to 1, is about between 0.6-0.9 with ature of coal different (stone coal, bituminous coal, brown coal), water is less than 0.5;

DIELECTRIC CONSTANT ε is different, and hard coal is about 2-3, and pure water is 81;

The electricalresistivityρ is different, and carbon is about 1-100 Ω cm, and graphite is 1-10 Ω cm approximately, and coal is 10-100 Ω cm approximately, and pure water is much bigger, but usually is dissolved with multiple salinity in light water, therefore resistivity is much smaller, common common resistivity of water is less than coal;

Transient-state temperature t is different, water is owing to being that liquid has convection action, temperature conduction is faster than the coal of solid, coal seam water due to its mobility thereby its temperature not identical with the coal seam, when particularly snow mountain dissolves the snow-broth that forms and flows through the coal seam, its temperature is obviously lower than the coal seam, and the underground water of the inclined seam of flowing through can be not identical with the coal seam of flowing through because of its temperature of its mobility yet, exists thermograde Δ t.

The difference of these 4 physical constants is to utilize the radio radiation method to measure the basic foundation of coal seam water.

The underlying instrument of measuring coal seam water with the radio radiation method is exactly the radio radiation meter.Because coal seam and coal seam water raise and sharply raise with electromagnetic frequency electromagnetic absorption, so the electromagnetic wave of the Boltzmann radiation that can be received is mainly low frequency and ultralow frequency component, so, in brief, the radio radiation meter of measurement coal seam water of the present invention is a kind of low frequency and ultralow frequency radiation meter.

The present invention is by the following technical solutions:

A kind of coal seam water radio measuring instrument, it is characterized in that, described coal seam water radio measuring instrument comprises binary channels low frequency and ultralow frequency radiation meter and two groups of double antenna groups, described binary channels low frequency and ultralow frequency radiation meter, passage one is DICK formula broadband total intensity receiver for radiometer, and its 3db Bands is wide is 500Hz～6.5MHz; Passage two is 16 passage scanning resonant mode total power radiometer receivers, and its 16 passage scanning resonant tank centre frequency is 200Hz～1.05MHz; Two groups of double antenna groups are respectively the board-like double antenna group of plate aerial and ferrite antenna composition and the tubular type double antenna group of helical antenna and ferrite antenna composition; Described coal seam water radio measuring instrument also comprises A/D conversion, digital demonstration and registering instrument, explosion-proof rechargeable Ni-H 2 battery group, DC/DC translation circuit and high-accuracy stabilized voltage supply.

In described coal seam water radio measuring instrument, all be placed in altogether afterwards in the drip-proof type sealing metal shell that has the metal-coated membrane glass window with the airtight shielding of the silver-plated shell of bilayer separately except antenna sets, antenna sets is introduced antidrip sealing metal shell with the flame-proof explosion-proof cable by sealing adaptor.

Radio radiation meter of the present invention can be measured the radiation intensity of coal and water, and measures the different transient-state temperature t of coal and water by the different emission ratio σ of coal and water.By to the demarcation of receiver absolute calibration, Antenna aperture absolute calibration, moisture-free coal and the underground water of radio radiation meter etc., can distinguish in the coal seam the coal water cut what, can judge coal seam different parts underground water abundance etc.

In described coal seam water radio measuring instrument, passage one is lower for intensity, the mensuration of more stable broadband coal seam water radio radiation, passage two is higher for intensity, the mensuration of coal seam water radio radiation intensity that different frequency radiation intensity difference is larger, and can mutually compare with reduce false alarm and erroneous judgement.

Water cut different its equivalent resistivity ρ in coal seam are also different, thereby the absorption to radio radiation is also different, during the left-right rotation plate aerial, the radiation intensity of different azimuth is just representing the relative ratios of its radiation and absorption, can obviously distinguish thus the coal seam water cut of different azimuth.Accordingly, water cut different its effective dielectric constant ε in coal seam are also different, the change of the refractive direction that the different medium layer that it causes causes is also different, can measure the variation of the radiation intensity that this kind change causes during up and down pivotal plate antenna, thereby by calibration with calculate the changing value of coal seam water cut on different luffing angles.

Described board-like double antenna group is mainly used in digging tunnel coal section detection, and ferrite antenna is parallel to be installed on above the plate aerial frame, and both can do level or pitching rotation on antenna mount.16 segmented ferrite antennas of preferred 0.5 meter square plate aerial and 0.4 meter long.

Described plate aerial is to be placed in accurate logarithm period flat plane antenna in the flat square box of low loss dielectric, that cladded by high ε medium powder, that inductance loads.Its antenna main lobe is perpendicular to antenna plane.Concentric cable is drawn, wideband operation.

Described ferrite antenna is that 16 tapped-windings are wound on the long feerod of 40cm, and 16 combination coaxial cables are drawn, and is undertaken tuningly by Single-chip Controlling tuning capacitance in machine, carries out frequency-selecting; Antenna radiation pattern is 8-shaped.

Described tubular type double antenna group is mainly used in having the topped tunnel flank hole of entanglement and cement to detect, formed by helical antenna and segmentation coiling ferrite antenna, ferrite antenna axle center and helical antenna axle center are on same straight line and be installed on the helical antenna rear end, both all are placed in the low loss dielectric hollow circular-tube, can stretch into the interior the place ahead of holing of detecting of holing and reach coal seam water cut on every side.16 segmented ferrite antennas of preferred 1 meter helical antenna and 0.6 meter long.

Described helical antenna be preferably be placed in low loss dielectric pipe front end, by big L/D ratio (L/D 〉=20) helical antenna of high ε medium powder cladding.Its antenna main lobe directed forward.Concentric cable is drawn, wideband operation.

Described ferrite antenna be preferably be placed in low loss dielectric pipe rear end, 16 tapped-windings are wound on the long feerod of 60cm, 16 combination coaxial cables are drawn, and are undertaken tuningly by Single-chip Controlling tuning capacitance in machine, carry out frequency-selecting; Antenna radiation pattern is 8-shaped.

It is in order to adapt to survey water needs of different coal mine working environment that coal seam water radio measuring instrument of the present invention adopts two cover antennas combinations: Patcho antenna makes up and is mainly used in coal face or the ground, tunnel of blocking without wire netting; And tubular type antenna combination is mainly used in the bore detecting of coal face, scar or side, tunnel that wire netting blocks; Every suit Tian Xian Group closes and adopts double antenna is all can realize standalone probe in order to satisfy two-channel radiometer, can mutually compare to eliminate and disturbs and make a false report, and realize that the radiation characteristic of different antennae directional diagram compares.

in coal seam water radio measuring instrument of the present invention, described DICK formula broadband total intensity receiver for radiometer, both all access three end modulators through antenna socket and normal temperature terminator plate aerial in the double antenna group or the signal of helical antenna, aerial signal access band low noise prime amplifier after square-wave frequency modulation, after connecing tunable low pass filter filter radio-frequency component after amplifying, through 5 or 10db attenuator isolation after access 3 frequency rejection filters, through 10KHz, 15KHz and 100KHz Bands prevent the modulation aerial signal after system to amplify to make up band resistance loss through connecing buffer amplifier again, after shaking, its waveform that causes because dried spring trembles by the excision of edge trembling cut-off circuit sends into main amplifier, be amplified into the detection of Low Drift Temperature wave detector, the ultralow frequency square-wave modulation signal of the representative antennas signal power that detects is sent into DC preamplifier, through amplify and adjust zero level after send into low frequency demodulation rear end by large capacity capacitance.

low frequency demodulation rear end comprises that the road occurs for signal path and modulated square wave: signal path is main integration synchronous integrator, two-phase phase detector, auxiliary integral passive integrator, DC output amplifier successively, and the DC level of the sign aerial signal intensity after demodulation process is sent into the digital display registering instrument and shown and store in order to aftertreatment, the road occurs modulated square wave is that the 51.2KHz square wave that quartz oscillator produces becomes the 12.5Hz square wave successively after 12 grades of CMOS binary dividers, obtain 3 pairs half totally 7 tunnel just anti-phase 12.5Hz square-wave signals after the 1st pair of positive output Shaping of 4 road CMOS diphase signal generators, supply with respectively main integration synchronous integrator and two-phase phase detector after wherein the 2nd pair of 2 tunnel positive inversion signals are sent into respectively 4 road CMOS phase inverter bufferings, the 3rd pair of 2 tunnel positive inversion signal are sent into respectively 2 road inductive loads and are driven integrated packages with two solenoid controlled aerial signals driving three end modulators and the break-make of terminator, the 4th pair of 2 tunnel positive inversion signals send into through 2 road differentiating circuit overshoot excision control signal generation circuit that 2 road CMOS monostable oscillators consist of respectively, the 1st pair of inversion signal drives 1 road video driver and exports as external synchronization signal.

in coal seam water radio measuring instrument of the present invention, described 16 passage scanning resonant mode total power radiometer receivers, comprise 16 road concentric cable ferrite antenna access ports, Single-chip Controlling 16 tunnel scanning resonant tanks, aerial signal after resonant tank primary election is sent into the wideband low noise prime amplifier, after signal after prime amplifier amplifies is sent into high-frequency interferencing signal more than tunable low pass filter filtering 1.5MHz, through sending into the 3 active rejection filters of frequency after the isolation of 5-10db fixed attenuator, filtering 10KHz, aerial signal after 15KHz and 100KHz signal, through the buffer amplifier buffering, after amplifying and isolating out flip-flop, send into the possible 50Hz city's electrical interference of 50Hz rejection filter filtering, sending into the main amplifier with adjustable threshold values AGC function amplifies, pass through again the detection of Low Drift Temperature wave detector, the signal that detects is after video preamplifier is adjusted direct current biasing and amplified, through passive integrator integration filtering noise, the DC level of the sign aerial signal intensity after too low drift direct current amplifier amplifies is sent into the digital display registering instrument and is shown and store in order to aftertreatment.

Connect with the DC/DC transducer between described explosion-proof Ni-MH battery group and accurate stabilized voltage supply.Electric battery comprises+14.4V totally 12 joint rechargeable Ni-H 2 battery groups, and corresponding constant pressure and flow nickel-metal hydride battery charger; With battery-powered hold concurrently for the efficient DC/DC conversion isolation of wide input range (12V/ ± 15V, 12V/ ± 7V), isolation is for receiver circuit and battery or outer power supply are insulated fully, with the inhibition common mode interference to voltage stabilizer; 4 road power supplys after DC/DC conversion voltage stabilizing give+11V ,+5.5V ,-3 tunnel degree of stability of 5.5V reach 10 ^-6The accurate stabilized voltage supply power supply of magnitude, the latter still comprises corresponding EMI protection, filtering, decoupling, overheated, overcurrent and short-circuit protection circuit.

The leading indicator of radio radiation meter is sensitivity and gain stability.

The sensitivity of radio radiation meter is to characterize with the degree in the absolute temperature Kelvin scale (° K), small gap for the radiation temperature of measuring coal and water, the sensitivity of radio radiation meter reaches the magnitude of 1-5 ° of K at least, the sensitivity σ of coal seam water radio radiation meter of the present invention can reach 0.2 ° of K, namely can distinguish the temperature difference of 3 σ=3 * 0.2 ° K=0.6 ° K.

The gain stability of radio radiation meter is recently to weigh in the relative variation percentage of the whole radio radiation gain in the unit interval (10 minutes, 30 minutes, 1 hour), generally to reach 1%-5%, the gain stability of coal seam water radio radiation meter Dick formula of the present invention system can reach ± and 0.25%/every 30 minutes.

Advantage of the present invention and remarkable result:

1, the linear reception: owing to having adopted the special circuit design, the output of the machine and coal seam water radio radiation are linear, its linear dynamic range reaches 40db, can reach 60db through adjustable threshold values agc circuit, re-use calibration curve as calculated machine maintenance just can reach 80db, i.e. water-jet electric radiation measurement range can from-120dBm～-40dBm.This just can export the reading demarcation with instrument by the receiver absolute calibration and be radiation temperature, then is radiant flux by the calibration of antenna gain actinal surface with its demarcation, can directly be designated at last the relative water content of wet coal by water and the dry coal calibration of the universe.And if the Bian step-by-step counting is difficult to set up the linear relationship of instrument output and coal seam water radio radiation Strong degree, just instrument can not be exported also that reading demarcates is water-jet electric radiation Strong degree.

2, two cover Double directional aerial combinations receive: board-like double antenna group and tubular type double antenna group, and the former is used for coal seam section detection, and the latter is used for the top, tunnel of covering metal silk screen and the detection of side, both are by the common radio radiation that receives from coal seam water of Double directional aerial group that is arranged on same plane or same axis, one the high ε medium of low-loss is sealed the accurate logarithm period plate aerial in broadband or the high ε medium of low-loss is sealed the big L/D ratio broadband helical antennal for inductance loads, another can switch tuning (double or three times of lengthenings) many segmented antenna of ferrite piecemeal for Single-chip Controlling, the former and the latter have different antenna direction characteristics, both combine common reception and are conducive to direction finding to coal seam water radio radiation source from the radiation of coal seam water, differentiate useful signal, suppress to disturb, reduce false alarm.And can utilize flat plane antenna or the helical antenna polarization characteristic different from ferrite antenna to distinguish the polarization in coal seam water radio radiation source and then segment its end face situation of meeting head on (end face is to development end or side to development end etc.).

3, the hyperchannel multisensor receives: by be contained in same antidrip machine in closing the modulation receiving instrument and the total power receiving instrument by the common signal that receives from same coal seam water-jet electric radiation source of double antenna group, because of its different reception system (modulation, total power), receive frequency range (500Hz-6.5MHz; 200Hz-1MHz), receiving gain characteristic (linear gain, adjustable threshold values AGC gain), reception instant bandwidth (Whole frequency band 6.5MHz; Resonant tank bandwidth＜50KHz) and integral time (2S; 0.25S), realize that the hyperchannel multisensor receives, export comparison and threshold values overlaps criterion reduce false alarm widely by two-shipper, also can more effectively suppress interference simultaneously and reach and more effectively observe useful signal form and parameter.

4,10 ° of direction findings: utilize inductance in the Double directional aerial group to add the high ε medium of load-loss and seal broadband logarithm period plate aerial in the antenna main lobe directivity of medium wave and middle long wave and the 8-shaped directivity of many segmentations of ferrite broad-band antenna, be as the criterion with the antenna plane normal, in face each choosing of front both sides a bit, rotary antenna is found out the angle of line between the antenna plane of coal seam water radio radiation maximum response and at 2 separately, can obtain the orientation in coal seam water radio radiation source and the length of normal of line between 2 o'clock.Its direction finding precision can reach 10 °, and this index far surpasses reported in literature.

5, measure the coal seam water relative water content of coal seam water enrichment region: using gain stability reaches ± the linear receiving equipment of 0.5%/modulation system radio radiation hourly, can measure exactly by the calibration of receiver Cooling and Heat Source and Antenna aperture calibration technology the coal seam water radio radiation temperature that antenna is received, obtain again the distance in antenna and source by direction finding, actual measurement obtains the radiant flux that coal seam unit length attenuation coefficient can calculate coal seam water radiation source itself, and then the match-drill actual measurement obtains the liquid water content of coal seam water enrichment region, can draw the liquid water content relation of radiant flux and coal seam water enrichment region under a certain geology and coal seam conditions.This method is also not report in domestic and foreign literature.

6, all real time record and storages of test data, more high performance computer workstation easy to use carries out subsequent treatment and data readback, this is for stockpile, and further seeking geologic structure, seam construction characteristic, underground water and Bian pick regularity each other has very high value.

More than comprehensive, coal seam water radio measuring instrument of the present invention is used the modulation receiving equipment with high-gain stability, can measure comparatively accurately the coal seam water radio radiation; Two cover double antenna combinations, hyperchannel reception, adjustable threshold values AGC, synchronous integration etc. can be differentiated interference, the reduce false alarm rate effectively; Broadband radio is measured and the arrowband resonant tank is measured, and coal seam water observation intuitively and early warning are provided; The measurement of directive antenna two point has realized coal seam water enrichment region orientation and length of normal measurement, for the detection of coal seam water extraction has supplied new means.

Describe the present invention below in conjunction with specific embodiment.Protection scope of the present invention is not limited with embodiment, but is limited by claim.

 

Description of drawings

Fig. 1, coal seam water radio measuring instrument overall block-diagram;

wherein: 1, external 1 meter long helical antenna, 2, the external 16 long ferrite antennas of segmentation 60cm, 3, external 0.5 meter plate aerial, 4, the external 16 long ferrite antennas of segmentation 40cm, 5, Dick's formula receiver for radiometer rf modulations front end, 6, total power formula receiver for radiometer radio-frequency front-end, 7, Dick's formula receiver for radiometer radio demodulating rear end, 8, total power formula receiver for radiometer demodulation rear end, 9, ten six tunnel scanning resonant control circuits, 10, single chip machine controlling circuit, 11, DC/DC conversion Voltage stabilizing module (12V/ ± 15V, 12V/ ± 7V), 12, three tunnel accurate stabilized voltage supply (+11V, ± 5.5V), 13, built-in explosion-proof rechargeable Ni-H 2 battery group (12 * 1.2V10AH), 14, external constant voltage constant current charging device, 15, the two-way numeral shows storage registering instrument 3.5 " LCD.

Fig. 2, coal seam water radio measuring instrument DICK formula broadband total intensity receiver for radiometer block scheme;

1, filter with low insertion loss video three end modulators, 2, the wideband low noise prime amplifier, 3, tunable low pass filter, 4, the isolation attenuator, 5, three frequency rejection filters, 6, buffer amplifier, 7, the overshoot cut-off circuit, 8, accurate voltage control Amplifier, 9, temperature compensation multiplication of voltage wave detector and direct current zero amplifier, 10, main integration synchronous integrator, 11, the two-phase phase detector, 12, passive integrator, 13, the output direct current amplifier, 14, quartz oscillator, 15, ten secondary 2 frequency dividers, 16, four road diphase signal generators, 17, six inverter buffers, 18, two differentiating circuit, 19, overshoot cut-off circuit gating pulse produces circuit, 20, the external synchronization signal impact damper, 21, the two-way inductive load drive circuit, 22, the input power filtering circuit.

Fig. 3, coal seam water radio measuring instrument 16 tunnel scanning resonance total power formula receiver for radiometer block schemes;

Wherein: 1, ten six tunnel scanning resonant tanks, 2, single-chip microcomputer scanning resonant controller, 3, inferior wideband low noise prime amplifier, 4, tunable low pass filter, 5, isolation attenuator, 6, three frequency rejection filters, 7, buffer amplifier, 8, civil power 50Hz rejection filter, 9, the isolation attenuator, 10, adjustable threshold values AGC amplifier, 11, temperature compensation multiplication of voltage wave detector, 12, the direct current zero amplifier, 13, passive integrator, 14, output direct current amplifier, 15, the input power filtering circuit.

Fig. 4, coal seam water radio measuring instrument double channel A/D conversion and 3.5 inch LCD display block schemes;

Wherein: 1, dual input switching and sampling hold circuit, 2,10 bit A/D transducer, 3, the data processing and control one-chip CPU, 4, internal memory, 5, liquid crystal display one-chip CPU and 3.5 " LCD, 6, output controls one-chip CPU, 7, stabilized voltage supply in machine.

Fig. 5, the board-like double antenna combination of coal seam water radio measuring instrument (accurate logarithm period flat plane antenna and the long ferrite antenna of 40cm) block scheme;

Wherein: 1, right 1 oscillator of accurate logarithm period flat plane antenna, 2, accurate logarithm period flat plane antenna coaxial-cable feeder, 3, loaded cable, 4, accurate logarithm period flat plane antenna lengthens oscillator, 5, left 1 oscillator of accurate logarithm period flat plane antenna, 6, the bonding one-tenth of two 20cm feerods 40cm feerod, 7, totally 16 segmented ferrite antenna windings, 8,16 fluorothene coaxial-cable feeder of ferrite antenna.

Fig. 6, coal seam water radio measuring instrument tubular type double antenna combination (the long ferrite antenna of big L/D ratio helical antenna and 60cm) block scheme;

wherein: 1, the sealing of tubular type antenna outer tube top, 2, tubular type antenna big L/D ratio helical antenna inner support insulation garden pipe, 3, tubular type antenna big L/D ratio helical antenna copper pipe winding, 4, high ε medium powder filling material, 5, tubular type antenna filter with low insertion loss insulating coating pipe, 6, butt-end packing in the middle of tubular type antenna outer tube, 7, tubular type antenna big L/D ratio helical antenna coaxial-cable feeder, 8, the three bonding one-tenth of 20cm feerod 60cm feerod, 9, totally 16 segmented ferrite antenna windings, 10, 16 fluorothene coaxial-cable feeder of ferrite antenna, 11, the sealing of tubular type antenna outer tube terminal surface.

Fig. 7, coal seam water radio measuring instrument chargeable battery group, DC/DC conversion voltage stabilizing and accurate stabilized voltage supply block scheme;

wherein: 1, debugging external power supply+15V, 2, built-in explosion-proof rechargeable Ni-H 2 battery group 12 * 1.2V, 7.5AH reach overload protection arrangement, 3, external constant voltage constant current charging device, 4, external power supply plug special (antidrip), 5, internal power supply import and export socket (antidrip), 6, external charger plug special (antidrip), 7, complete machine is connected the internal battery group plug special instrument power-on switch (antidrip) of holding concurrently, 8, pulse suppresses, interference filter and overheated self-shield resistance, 9, DC/DC conversion Voltage stabilizing module (+12V/ ± 15V, 15W), 10, the EMI filtering circuit, 11, DC/DC conversion Voltage stabilizing module (+12V/ ± 7V, 15W), 12, the EMI filtering circuit, 13, positive and negative source of stable pressure starting protection circuit, 14, the pre-mu balanced circuit of+13V, 15, the pre-mu balanced circuit of-13V, 16, the accurate reference source of high stability (+5.00V), 17, the accurate stabilized voltage supply of+11V high stability, 18, the accurate stabilized voltage supply of+5.5V high stability, 19,-5.5V follows the tracks of the accurate stabilized voltage supply of high stability, 20, peak restrained, reverse protection and four-wire circuit, 21, peak restrained, reverse protection and four-wire circuit, 22, peak restrained, reverse protection and four-wire circuit.

 

Embodiment

Coal seam water radio measuring instrument of the present invention comprises 2 large systems, i.e. DICK formula broadband total intensity radiometer system and 16 tunnel scanning resonant mode total power radiometer systems can further be subdivided into 6 sub-systems:

1, the board-like double antenna combination of plate aerial and ferrite antenna (Fig. 4);

2, helical antenna and ferrite antenna tubular type double antenna combination (Fig. 5);

3, DICK formula broadband total intensity receiver for radiometer (Fig. 2);

4,16 tunnel scanning resonant mode total power radiometer receivers (Fig. 3);

5, A/D conversion, one-chip CPU and LCD display recorder (Fig. 6)

6, hold concurrently mu balanced circuit and low-power consumption 10 of protected against explosion nickel-hydrogen chargeable cell group and external constant voltage constant current charging device, DC/DC conversion ^-6The accurate stabilized voltage supply (Fig. 7) of magnitude degree of stability.

Referring to Fig. 1, coal seam water radio measuring instrument of the present invention specifically comprises DICK formula broadband total intensity receiver for radiometer, 16 tunnel scanning resonance total power formula receivers for radiometer, plate aerial and the board-like double antenna group of ferrite antenna, helical antenna and ferrite antenna tubular type double antenna group, A/D conversion, one-chip CPU (control and data are processed) and LCD display and registering instrument, explosion-proof rechargeable Ni-H 2 battery group, DC/DC conversion voltage stabilizing and accurate stabilized voltage supply, and external constant voltage constant current charging device.All be placed in altogether afterwards in the antidrip shell that has the transparency display window mouth with the airtight shielding of the silver-plated shell of bilayer separately except two cover antenna sets, each introduces antidrip shell with flame-proof explosion-proof cable A, B, C, D by two sealing adaptors to two cover antenna sets, to adapt to requirements of one's work under high regimen coal mine.The access numbering of two 19 core pressure terminals of two cover double antenna groups is identical, each own independent grounding end (1+1+16+1=19) of two antennas in every cover antenna combination, therefore can share same ice detector antenna input socket, and can be switched easily with need of work under coal mine, direct current Vent discharge road is arranged in machine, prevent that electrostatic induction voltage from gathering, prevent that also in antenna electric charge and machine, voltage Vent drains on antenna, to guarantee safety.

DICK formula broadband its block diagram of total intensity receiver for radiometer as shown in Figure 2, its input end (in) is for connecting 50 Ω SMA sockets of plate aerial or helical antenna output cable, this SMA socket is received three end filter with low insertion loss (＜0.2db through semi-rigid cable, the antenna input port of 0～7MHz) modulator, another input port of three end filter with low insertion loss modulators is received 50 Ω SMA sockets and external 50 Ω SMA precision loads through semi-rigid cable, after the 12.5Hz square-wave frequency modulation, the output port of three end filter with low insertion loss modulators is received low noise high-gain prime amplifier (Nf:2db through semi-rigid cable, Gmax:37db) input end, this amplifier is for reducing 1/f noise and high frequency white noise and reducing dc shift, the first order has adopted low noise J-FET differential pair tube (2N6484) to make differential amplification and with the silicon crystal triode, pipe has been consisted of constant current source, the second level has adopted low noise J-FET differential pair tube to make the difference source follower equally, has consisted of difference cascode collector altogether.for suppressing the right output common mode component of voltage of two-stage differential so that low noise amplifier output terminal DC level is bordering on the high frequency of zero level and compensation J-FET cascode differential amplifier descends, Bian used by two high-speed wideband low noise double operationals (EL2227) and four pairing precision reach ± high cmrr instrument that 0.02% high-accuracy resistance consists of is with amplifying circuit and frequency compensation in addition, obtain almost from flat response and the mv level output offset of 0～6.5MHz, the instrumentation amplifier output terminal is received the input end of multi-octave tunable low pass filter through semi-rigid cable, for reducing the rear class noise, the multi-octave tunable low pass filter first order is Bian high-speed wideband low noise amplifier (OPA846) still, the two or three grade for frequency feedback take analog multiplier as the basis the adjustable lowpass filtering circuit, comprise the broadband operational amplifier integrator, controllable gain amplifier (VCA810) and unity gain buffer stage consist of, can control voltage change bandwidth by adding, can obtain fh(-3db) from the adjustable low-pass filtering regulating effect of 10KHz～14MHz, but but also computer program control of hand adjustment, gain G max:12db, its Buffer output is received the input end of 50 Ω isolation attenuators through semi-rigid cable, for regulation output level and the impact of isolation rear class, added film isolation attenuator, its damping capacity can be selected between 5～30db, and isolation attenuator output terminal is received the multiple spot input end of the active filter of interference fringe resistance frequently surely through semi-rigid cable, disturb in order to suppress to decide the frequency long wave, suppressed for the rowland that knows-C navigation 100KHz, unknown long-wave communication 10KHz, 15KHz, the spy has added the active rejection filter of second order by high-speed wideband low noise double operational (EL2227) formation of these three frequencies, because the even-order harmonic of the synchronous phase detector of this modulation system receiver suppresses ability, need not be with for the first-harmonic of the mains frequency of 50Hz(12.5 * 4=50Hz) and humorous wave interference and prevent system, its output terminal is received the input end of broadband buffer amplifier through semi-rigid cable, in order to isolate and compensate loss and the mismatch of active filter, broadband isolation amplifier (the Δ f:0-60MHz that the spy adds one-level high-speed wideband low noise amplifier (OPA846) to consist of, Gmax:16db), its output terminal is received the input end of main amplifier through semi-rigid cable, the signal that is input to main amplifier is sent into the modulated square wave forward position upper punch cut-off circuit that is made of wide-band bidirectional cmos analog switch (43113) after buffering, controlled by overshoot excision gating pulse, excision is repeatedly the beat shake waveform in the square wave envelope forward position of causing of the dried spring when closed because of modulator switch, the control end of analog switch receives through semi-rigid cable the output terminal that modulated square wave upper punch excision gating pulse produces circuit, the output terminal of analog switch is connected to take the program-controlled great dynamic range main amplifier (VCA810) of analog multiplier as the basis, but programmed control also can be manual, gain variation range reaches+35db～-35db, high-end 20～the 30MHz that reaches of main amplifier passband, Gmax can reach 60db, main amplifier is received the input end of two differential pair tube multiplication of voltage wave detectors with semi-rigid cable after unity gain buffer, the Low Drift Temperature wave detector is to be encapsulated in the multiplication of voltage detecting circuit with temperature compensation and the compensation of silicon diode starting potential that 4 interior silicon crystal triodes of a shell all connect into two differential pair tubes (2FC2C) formations of ultrahigh frequency of cb-e knot, and the effective input voltage range of its detection can be from 20～600mV.Thereafter the video amplifier that consists of for the wideband low noise amplifier (OPA27) of regulating with output offset can be biased to≤1mV by regulation output without input voltage the time.Approximately 3 times of voltage gains, the input end of synchronous integrator is received in its output through semi-rigid cable; By the synchronous integration circuit of two broadband CMOS bidirectional analog switches (43113) with wideband low noise amplifier (OPA27) formation, two control ends of analog switch are received respectively homophase and the reversed-phase output of bi-phase modulated square-wave generator, its driving is synchronizeed with modulated square wave, can greatly suppress and the nonsynchronous interference of modulated square wave and noise signal the large antijamming capability of Strong modulation system radiation receiving equipment greatly.Signal is sent into the two phase synchronous phase detection circuit of two broadband cmos analog switches (43112,43113) and wideband low noise amplifier formation after synchronous integration, under the control signal effect of synchronizeing with modulated square wave, demodulate useful signal under the modulated square wave envelope, pass through again the direct current signal of exporting a representative antennas input signal Strong degree after the rear in-phase amplifier by 10 times of gains of passive integrator (1S) accumulation amplifies, deliver to the A/D input end.the modulated square wave signal generator is by quartz oscillator, ten secondary 2 frequency dividers (CD4040), four road diphase signal generators (CD4041), six inverter buffers (CD4069), two differentiating circuit, modulated square wave upper punch excision pulse-generating circuit (CD4098), external synchronization signal impact damper (OPA27), two-way inductive load drive circuit (MDC3105), the formations such as input power filtering circuit, be specifically designed to and produce two-phase 12.5Hz modulation driving square wave (for three end modulators), 2 tunnel two-phase 12.5Hz square waves (for synchronous integration and synchronous detection dual analog switch) and 12.5Hz turnable pulse width and adjustable delay modulated square wave upper punch excision gating pulse (for the main modulated square wave upper punch cut-off circuit of putting).

16 its block diagram of passage scanning resonant mode total power radiometer receiver as shown in Figure 3, from 16 sections sectional coil 40cm or 16 next polytetrafluoroethylcable cables of the bar-shaped antenna of the long Mn-Zn ferrite of 60cm, after 19 core cable sockets, one of 16 coaxial dry reed switch who connects respectively program-controlled multiple spot low insertion loss broadband coaxial dry spring switch type mechanical tuning circuit through concentric cable, the other end of 16 coaxial dry reed switch all rear coaxial dry reed switch with 4 one whole parallel connections in parallel is connected, the other end of 4 coaxial dry reed switch connects respectively the low-loss tuning capacitance with different capabilities, 20 coaxial dry reed switch that are embedded with solenoid outward altogether, whether the solenoid conducting is its basic conducting control module by 20 relay inductive load drive integrated circults (MDC3105), this integrated circuit (MDC3105) control input end connects the displacement output terminal that the high-speed cmos shift register (74HC595) of voltage generation unit is controlled in single-chip microcomputer (AT89C2051) step-scan.One stature of 20 coaxial dry reed switch is all in parallel receives sub-miniature A connector as ferrite antenna frequency-selecting tuning operation by concentric cable, receives low noise junction field effect differential pair tube (2N6484) differential input end of low noise high-gain prime amplifier after semi-rigid cable and sub-miniature A connector; Single-chip microcomputer front end Frequency Selection Controller is made of CMOS single-chip microcomputer (AT89C2051) and 2 high-speed cmos shift registers (74HC595), can accept external synchronization signal controls, also can produce voluntarily the conducting control signal of 16+4=20 road MDC3105 altogether, can consist of 16 * 4=64 or a 16 * 1=16 resonant tank.Be connected with 20 polytetrafluoroethylcable cables between outer synchronous single-chip microcomputer front end Frequency Selection Controller and coaxswitch formula mechanical tuning circuit; Low noise high-gain prime amplifier is total to the high cmrr instrumentation amplifier the electric circuit constitute of collector (2N6484) and two-stage low noise double operational (EL2227) formation by two-stage low noise junction field effect difference cascode, the instrumentation amplifier output terminal is received the input end of multi-octave tunable low pass filter device through semi-rigid cable; The multi-octave tunable low pass filter is made of input Hyblid Buffer Amplifier (OPA846) broadband operational amplifier integrator (OPA820), controllable gain amplifier (VCA810) and unity gain buffer stage, can control voltage change bandwidth by adding, its Buffer output is received the input end of 50 Ω isolation attenuators through semi-rigid cable; Controlled isolation attenuator is made of the book film integrated circuit, and its decay can be adjusted between 10～30db, and its output terminal is received the input end of 3 the fixed resistance of interference fringe frequently active filters through semi-rigid cable; Disturb in order to suppress to decide the frequency long wave, suppressed for the rowland that knows-C navigation 100KHz, unknown long-wave communication 10KHz, 15KHz, the spy has added the active rejection filter of second order that is made of high-speed wideband low noise double operational of these 3 frequencies.3 the fixed resistance of interference fringe frequently active filters consist of 3 grades of active second order rejection filters by six double operationals (EL2227), pass through with inhibition 15KHz, 10KHz, 100KHz undesired signal, its output terminal is received the input end of broadband buffer amplifier through semi-rigid cable; In order to isolate and to compensate broadband isolation amplifier (the Δ f:0-60MHz that the loss of active filter and mismatch spy add one-level high-speed wideband low noise amplifier (OPA846) to consist of, Gmax:16db), its output terminal is received the input end of the active second order rejection filter of 50Hz through semi-rigid cable, disturb first-harmonic to suppress the 50Hz civil power; The output terminal of the active second order rejection filter of 50Hz is received the input end of 50 Ω 5db isolation attenuators through semi-rigid cable; This isolation attenuator is to give the impact of adjustable threshold values AGC main amplifier in order to isolate rejection filter, and its output terminal is received the input end of the adjustable threshold values AGC of great dynamic range main amplifier through semi-rigid cable; Great dynamic range is adjustable, and threshold values AGC main amplifier is made of little capacitance integral comparer and wave detector, controllable gain amplifier (VCA810) and unity gain buffer stage, little capacitance integral comparer compares the difference of controllable gain amplifier output and adjustable threshold values AGC initial level, the gain control end of access controllable gain amplifier is realized adjustable threshold values AGC effect after detection, and the unity gain buffer output terminal is received the input end of the two differential pair tube multiplication of voltage wave detectors of Low Drift Temperature with semi-rigid cable; Two differential pair tube multiplication of voltage wave detectors are by the multiplication of voltage wave detector of two differential pair tubes (2FC2C) formations of the ultrahigh frequency that all connects into the cb-e knot with temperature compensation, the video amplifier that the wideband low noise amplifier (OPA27) that rear tape splicing output offset is regulated consists of can be biased to≤1mV by regulation output without input voltage the time.Approximately 3 times of voltage gains.The input end of passive integrator is received in its output; The integrating circuit that passive integrator is 0.25S by time constant consists of, the Low ESR output direct current signal of a representative antennas input signal Strong degree of output after sending into the DC output amplifier that 10 times of voltage gains are arranged that consists of with wideband low noise amplifier (OPA27) after integration, be the output of whole 16 passages scanning resonant mode total power radiometer receivers, receive the input end of the total power A/D of data processes and displays device through semi-rigid cable and sub-miniature A connector.

Coal seam water-jet electricity Measuring amount instrument double channel A/D conversion and 3.5 inch LCD digital indicators and record storing apparatus and see Fig. 4 comprise dual input switching and sampling hold circuit, 12 bit A/D transducer, data processing and control one-chip CPU, internal memory, liquid crystal display one-chip CPU and 3.5 " LCD, output control one-chip CPU with interior voltage-stabilized power supply; Can flat two-way 12 digital bits that carry out simultaneously of output DC of DICK formula broadband total intensity receiver for radiometer and 16 roads scanning resonant mode total power radiometer receiver be shown, be that two-way ± 5.000V shows, and can record and be stored in USB flash disk, conveniently read.Also can or export with the analog interface electric current by the output of USB mouth numeral.

Plate aerial and ferrite antenna combination block figure see Fig. 5, and this antenna sets is the long and medium wave directional antenna group of double antenna.Double antenna system seals inductance by the high ε medium of the low-loss that is installed together and wears meander line and extend the accurate logarithm period plate aerial of oscillator and Single-chip Controlling and can satisfy section and switch 16 segment of double and doubly lengthen (40cm) manganese-zinc ferrite body antenna and jointly form Double directional aerial and receive, and plate aerial is connected with the SMA antenna input socket of modulation instrument through 19 core seal sockets of antidrip shell by fire-retardant co-axial cable, ferrite antenna passes through 16 SFF-50-1.5 cables and is connected with the interior 19 core antenna input sockets of total power instrument through the same 19 core seal socket A of antidrip shell.Two kinds of antennas all have directivity more than the middle-end of frequency acceptance band, utilize the high ε medium of low-loss in Double directional aerial to seal inductance and wear meander line and extend surface level antenna location that 8-shaped directivity that the accurate logarithm period plate aerial of oscillator doubly lengthens the manganese-zinc ferrite antenna in antenna main lobe directivity and many segment of double of medium wave and middle long wave realizes 10 °, and utilize in the vertical direction that half-twist receives the signal polarization characteristic measurement; And utilize triangulation location to place antenna in a distance baseline two-end-point, measure respectively the source with 2 between the angle of line, know that base length can obtain the orientation of coal seam water enrichment region and arrive the length of normal of baseline.

Long helical antenna and ferrite antenna prescription block diagram are seen Fig. 6, and this antenna sets is the long and medium wave directional antenna group of double antenna.Tubulose double antenna system by be arranged in a low high-frequency loss medium garden pipe and be placed in up and down the high ε medium of low-loss on same axis and seal big L/D ratio helical antenna and Single-chip Controlling and can satisfy section and switch the Double directional aerial reception that 3 times of lengthening of 16 sectional coil (60cm) manganese-zinc ferrite body antenna forms jointly and make up, two kinds of antennas all have directivity more than the middle-end of frequency acceptance band.The axial length of big L/D ratio helical antenna is 1m, screw diameter is 4cm approximately, use the hollow copper tube of φ 3mm interval 3mm to be wound on the bead of the low high-frequency loss medium tube of hollow thread, approximately 165 enclose, its total length is 20.7m approximately, and helical antenna is connected with the SMA antenna input socket of modulation instrument by the 19 core seal sockets of fire-retardant co-axial cable through antidrip shell.The top of tubulose antenna, middle-end and end all glue together and are waterproof with fluid sealant and medium tube.

Selection for the 16 bar-shaped antennas of sectional coil ferrite, comprise the selection of material and the winding method of feerod: the material of feerod can be divided three classes substantially: shortwave ferrite (Ma-Zn material, magnetic permeability mu below 50, be applicable to 1-20MHz), medium wave ferrite (Mn-Zn material, magnetic permeability mu between 50-800, be applicable to 0.4MHz-2MHz), long wave ferrite (Mn-Zn material, magnetic permeability mu more than 1000, be applicable to below 100KHz).In order to cover the wide frequency range from 1KHz to 1MHz, preferred Bian Mn-Zn medium wave feerod.Because the magnetoconductivity of medium wave bar magnet is not high enough, need the hundreds of thousands of circles of coiling when the coil winding of coiling 10KHz magnitude, cause distributed capacitance and leakage inductance too large, so the present invention adopts the way of segmentation coiling, it is 60 sections that whole coils are divided into, the centre tap of all connecting, totally 16 windings.Respectively with 16 polytetrafluoroethylcable cables in 19 core seal sockets are introduced antidrip casings.Satisfy 16 coils of connection by 16 filter with low insertion loss coaxswitches of Single-chip Controlling again, control simultaneously 4 filter with low insertion loss coaxswitches, 4 low high-frequency loss electric capacity of connection then, realize that the scanning of 16 resonant tanks between 0.5-1000KHz is fixing tuning.

Because the Boltzmann radiation is a kind of heat radiation of white noise formula, the full frequency band of the topped electromagnetic radiation of its frequency range in theory, namely from extremely low frequency to the extremely high frequency, but the absorption due to coal rock layer, the signal of upper frequency almost loses totally the sixth of the twelve Earthly Branches when arriving receiving antenna, only has the lower signal of frequency to receive.For the measurement of coal seam water radio radiation signal, most signals all below 300KHz, are removed medium wave broadcast signal and part high reject signal and are seldom received in addition useful signal more than 300KHz.Can determine, for the coal seam water analyzer, radio frequency reception signal scope is between 200Hz-6.5MHz, and mainly concentrates on below 300KHz.

As if in general, an off the record agreement is arranged in Antenna Design, use wire antenna when namely frequency is low, use surface antenna when frequency is high, the length of wire antenna will reach just higher receiving efficiency more than λ/10-λ/20.The 500Hz-5MHz frequency translation is that wavelength is 600000m-60m, and is apparent, and the antenna that the energy high-level efficiency receives 60 myriametre wavelength signals is at all unpractical.The present invention adopts the class element antenna, is produced in the space of 0.5m * 0.5m, and to be about 5m be 60MHz to this antenna wavelength of working in λ/10; After using the folding oscillator, it is 30MHz that this folding element antenna is expected for 10m; After re-using meander line, it is 15MHz that this meander line folding element antenna is expected for 20m; After being aided with the inductance loading method, it is 6MHz that this inductance loading meander line folding element antenna is expected for 50m; Phase velocity due to electromagnetic wave in medium is 1/ ε in vacuum ^1/2If, adopting high ε medium cladding, this antenna might work in 50 * ε to make us the acceptable receiving efficiency ^1/2Wavelength on, if lower efficiency about 10KHz of might working.

The axial length of helical antenna is 1m, screw diameter is 4cm approximately, use the interval 3mm coiling of the hollow copper tube of φ 3mm, approximately 165 enclose, its total length is 20.7m approximately, as simulation whip antenna duty, might be operated on the 200m wavelength in λ/10, if adopt high ε medium cladding, this antenna might work in 200 * ε to make us the acceptable receiving efficiency ^1/2Wavelength on, if lower efficiency about 5KHz of might working.

The antenna holder of the subsidiary compass of described Patcho antenna group has the indication of position angle and luffing angle.

Coal seam water radio measuring instrument chargeable battery group, DC/DC conversion voltage stabilizing and accurate stabilized voltage supply are seen Fig. 7: specialize in the debugging use+the 15V external power interface; Built-in power uses 12 * 1.2V, 7.5AH to contain the explosion-proof rechargeable Ni-H 2 battery group of overload protection arrangement; External constant voltage constant current charging device for the charging of internal battery group; Electric battery is powered to two DC/DC conversion Voltage stabilizing module (+12V/ ± 15V, 15W by pulse inhibition, interference filter and overheated self-shield resistance; + 12V/ ± 7V, 15W); The output of DC/DC is after the EMI filtering circuit, the positive and negative pre-source of stable pressure of ± 15V supply ± 13V and start-up circuit, should ± the positive and negative pre-source of stable pressure of 13V is the accurate amplifier power supply of the accurate stabilized voltage supply of all 3 tunnel high stabilities, wherein+13V output also supplies high stability accurate reference source (+5.00V, 10PPM); The output of DC/DC is after the EMI filtering circuit; wherein+15V also supplies+the accurate stabilized voltage supply of 11V high stability; the accurate stabilized voltage supply of conduct respectively of ± 7V+5.5V high stability and-5.5V follows the tracks of the input power of the accurate stabilized voltage supply of high stability; the 3 tunnel accurate stabilized voltage supplys of high stabilities (+11V, ± 5.5V) output terminal is added with peak restrained, reverse protection and four-wire circuit respectively, and the output of the accurate stabilized voltage supplys of 3 tunnel high stabilities all can reach 10 ^-6The voltage-regulation coefficient of magnitude, 10 ^-5Under the current stability, of magnitude and room temperature and steady load every 30 minutes 10 ^-5The voltage drift stability of magnitude.

Be to improve antijamming capability, coal seam water radio measuring instrument of the present invention has adopted triple-shielded: each individual components is placed in silver-plated copper closing machine closes separately; Each subsystem is placed in independent silver-plated copper sealing machine shell; All subsystems are shelved and are placed in the antidrip shell of steel.Explosion-proof Ni-MH battery assembles the fire-retardant encapsulation of menopause edge in groups and floatingly independently is placed in copper can afterwards.The electric battery lead-in wire is in feedthrough capacitor is introduced DC-DC conversion and DC stabilized voltage supply casing, and the output of DC stabilized voltage supply is all introduced each subsystem casing through feedthrough capacitor again, and each individual components is all introduced power supply through feedthrough capacitor again.All connect through gold-plated sub-miniature A connector and semi-rigid cable again between all subsystem casings.Subsystem is connected with double antenna after the flame proof seal head with gold-plated sub-miniature A connector and flame retardant high-frequency cable.Strict like this shielding, the industrial noise, the medium short wave broadcasting that have not only greatly suppressed from space outerpace are disturbed, also cut off admirably between each individual components, each subsystem spatial impression should, power supply crosstalks, thereby greatly reduced the potential gain instability of system, improved system and received the virtual rating of faintly descending the water-jet electric signal.

The present invention is used for coal mine underground coal bed water-jet electric radiation source measurement, and its concrete use procedure comprises the following steps:

1, measure and to have or not the coal seam water radio radiation: what will include totally 6 equipment is placed in the driving face (being generally the workplace centre position) in colliery with the coal seam water radio measuring instrument of antidrip shell, plate aerial and ferrite antenna are aimed at rib, as modulation and total power two passage outputs, indication is arranged all both, show to have received signal.

2, judgement is coal seam water radio radiation signal: left rotation and right rotation plate aerial and ferrite antenna are observed modulation and the total power output reading on LCD simultaneously at leisure, the strongest when being confirmed whether to aim at the rib position, in this way, be from the coal seam water radio radiation mostly; Otherwise, be that interference or antenna radiation pattern have problem mostly.(this survey method is only applicable to present low gas or without fiery colliery, otherwise wants another method to measure).

3, measure coal seam water radio radiation source side position and distance: an end A point that the radio measuring instrument is placed in the driving face in colliery, baby compass on the nationality antenna is determined the angle [alpha] that the output maximal value in source is surveyed, the other end B point that is placed in again driving face is measured angle beta in accordance with the law, if the AB distance is L _a, the source is l=L to the vertical distance of L _a* tg α tg β/tg α+tg β.

4, measure the radiation temperature in coal seam water radio radiation source: the intersection point that the radio measuring instrument is placed in the L of driving face in colliery and l is namely on the nearest point in coal seam water radio radiation source, with the position in antenna alignment source, the radiation temperature value (through Cooling and Heat Source calibration and Antenna aperture calibration) of staying a minute and can seeing the source on LCD.

5, continue the danger of gushing out of the variation in monitoring coal seam water radio radiation source and early warning coal seam water: the emission types (stable state, unstable state, fast moving) that roughly judges coal seam water radio radiation source, and whether increase fast by continuing monitoring total power output reading, judgement coal seam water radio radiation source region geology changes severe degree, as both (modulation, total power) all increase fast Strong hummer send early warning sound.

6, for the coal face that has wire gauze to block or scar or wall, must bore upright opening on being tested surface, the aperture is φ 60mm approximately, hole depth is 1.8m approximately, uses the tubular type antenna sets to stretch in the hole until bottom, and the feeder line of tubular type antenna sets is replaced Patcho antenna access coal seam water radio measuring instrument, slightly wait upon a moment, read reading after the digital display stable reading, and repeat the operation steps of above-mentioned 1-5, centre distance L between only need holing with two antennas _bReplace L _aGet final product.

7, the radio radiation value by the half-mark of water and dry coal being decided on unit distance both, by the measured data of the coal seam decay of different moisture content on certain distance and water are set up the coal seam water radiation temperature, are hung down apart from relation formula and mathematical model between, thickness of coal seam and coal seam water cut the measured data of ultralow frequency radiation decay, direct demonstration coal seam water cut on LCD after numerical evaluation.

8, playback of data and deposit on the mass computing workstation after upper well, carry out overall treatment after the accumulation several times, obtain the steady state of radiation temperature in coal seam water radio radiation source, obtain the Boltzmann temperature in coal seam water radio radiation source in conjunction with geologic data and coal seam water cut measured data, and reverse interpretation coal seam water enrichment region physical state.

Claims (10)

1. coal seam water radio measuring instrument, it is characterized in that, described coal seam water radio measuring instrument comprises binary channels low frequency and ultralow frequency radiation meter and two groups of double antenna groups, described binary channels low frequency and ultralow frequency radiation meter, passage one is DICK formula broadband total intensity receiver for radiometer, and its 3db Bands is wide is 500Hz～6.5MHz; Passage two is 16 passage scanning resonant mode total power radiometer receivers, and its 16 passage scanning resonant tank centre frequency is 200Hz～1.05MHz; Two groups of double antenna groups are respectively the board-like double antenna group of plate aerial and ferrite antenna composition and the tubular type double antenna group of helical antenna and ferrite antenna composition; Described coal seam water radio measuring instrument also comprises A/D conversion, digital demonstration and registering instrument, explosion-proof rechargeable Ni-H 2 battery group, DC/DC translation circuit and high-accuracy stabilized voltage supply.

2. coal seam water radio measuring instrument according to claim 1, it is characterized in that, described board-like double antenna group is comprised of 16 segmented ferrite antennas of 0.5 meter square plate aerial and 0.4 meter long, ferrite antenna is parallel to be installed on above the plate aerial frame, and both can do level or pitching rotation on antenna mount; Described plate aerial is to be placed in the accurate logarithm period flat plane antenna that the flat square box of low loss dielectric is interior, high ε medium powder clads, inductance loads, and its antenna main lobe is perpendicular to antenna plane; Described ferrite antenna is that 16 tapped-windings are wound on the long feerod of 40cm, and 16 combination coaxial cables are drawn, and carry out tuning frequency-selecting by the Single-chip Controlling tuning capacitance; Antenna radiation pattern is 8-shaped.

3. coal seam water radio measuring instrument according to claim 1, it is characterized in that, described tubular type double antenna group is comprised of helical antenna and segmentation coiling ferrite antenna, ferrite antenna and helical antenna are coaxial and be installed on long helical antenna rear end, and both all are placed in the low loss dielectric hollow circular-tube.

4. coal seam water radio measuring instrument according to claim 3, is characterized in that, described helical antenna be placed in low loss dielectric pipe front end, by the big L/D ratio 1M helical antenna of high ε medium powder cladding, its antenna main lobe directed forward; Described ferrite antenna is placed in low loss dielectric pipe rear end, and 16 tapped-windings are wound on the long feerod of 60cm, and 16 combination coaxial cables are drawn, and carry out tuning frequency-selecting by the Single-chip Controlling tuning capacitance, and antenna radiation pattern is 8-shaped.

5. coal seam water radio measuring instrument according to claim 1, it is characterized in that, described DICK formula broadband total intensity receiver for radiometer, comprise the connection of antenna entrance, the signal of plate aerial and helical antenna is through connection of antenna entrance and terminator access three end modulators, aerial signal access band low noise prime amplifier after square-wave frequency modulation, after connecing tunable low pass filter filter radio-frequency component after amplifying, through 5 or 10db attenuator isolation after access 3 frequency rejection filters, through 10KHz, 15KHz and 100KHz Bands prevent the modulation aerial signal after system to connect buffer amplifier to amplify to make up band resistance loss again, send into main amplifier after connecting the shake of edge trembling cut-off circuit excision waveform thereafter, be amplified into the detection of Low Drift Temperature wave detector, the ultralow frequency square-wave modulation signal of the representative antennas signal power that detects is sent into DC preamplifier, through amplify and adjust zero level after send into low frequency demodulation rear end by large capacity capacitance, low frequency demodulation rear end comprises that the road occurs for signal path and modulated square wave, signal path comprises main integration synchronous integrator, two-phase phase detector, auxiliary integral passive integrator, DC output amplifier successively, and the DC level of the sign aerial signal intensity after demodulation process is sent into numeral and shown and registering instrument.

6. coal seam water radio measuring instrument according to claim 5, it is characterized in that, the road occurs described modulated square wave is quartz oscillator successively, the 51.2KHz square wave of its generation becomes the 12.5Hz square wave after 12 grades of CMOS binary divider frequency divisions, obtain 3 pairs half totally 7 tunnel just anti-phase 12.5Hz square-wave signals after the 1st pair of positive output Shaping of 4 road CM0S diphase signal generators, supply with respectively main integration synchronous integrator and two-phase phase detector after wherein the 2nd pair of 2 tunnel positive inversion signals are sent into respectively 4 road CMOS phase inverter bufferings, the 3rd pair of 2 tunnel positive inversion signal are sent into respectively 2 road inductive loads and are driven integrated packages with two solenoid controlled aerial signals driving three end modulators and the break-make of terminator, the 4th pair of 2 tunnel positive inversion signals send into through 2 road differentiating circuit overshoot excision control signal generation circuit that 2 road CMOS monostable oscillators consist of respectively, the 1st pair of inversion signal drives 1 road video driver and exports as external synchronization signal.

7. coal seam water radio measuring instrument according to claim 1, it is characterized in that, described 16 passage scanning resonant mode total power radiometer receivers, comprise 16 road concentric cable ferrite antenna access ports, Single-chip Controlling 16 tunnel scanning resonant tanks, aerial signal after resonant tank primary election is sent into the wideband low noise prime amplifier, after signal after prime amplifier amplifies is sent into high-frequency interferencing signal more than tunable low pass filter filtering 1.5MHz, through sending into the 3 active rejection filters of frequency after the isolation of 5-10db fixed attenuator, filtering 10KHz, aerial signal after 15KHz and 100KHz signal, through the buffer amplifier buffering, after amplifying and isolating out flip-flop, send into 50Hz rejection filter filtering 50Hz city's electrical interference, sending into the main amplifier with adjustable threshold values AGC function amplifies, pass through again the detection of Low Drift Temperature wave detector, the signal that detects is after video preamplifier is adjusted direct current biasing and amplified, access passive integrator integration filtering noise, again after too low drift direct current amplifier amplifies, the DC level that characterizes aerial signal intensity is sent into numeral demonstration and registering instrument.

8. coal seam water radio measuring instrument according to claim 1, is characterized in that, described explosion-proof Ni-MH battery group comprises+and 14.4V totally 12 joint rechargeable Ni-H 2 battery groups, and corresponding constant pressure and flow nickel-metal hydride battery charger; Be connected with 12V/ ± 15V, 12V/ ± 7V DC/DC translation circuit between explosion-proof Ni-MH battery group and accurate stabilized voltage supply; 4 road power supplys after DC/DC conversion voltage stabilizing give+11V ,+5.5V ,-the accurate stabilized voltage supplys of 5.5V 3 tunnel.

9. coal seam water radio measuring instrument according to claim 8, is characterized in that, described accurate stabilized voltage supply degree of stability reaches 10 ^-6Magnitude also comprises EMI protection, filtering, decoupling, overheated, overcurrent and short-circuit protection circuit.

10. coal seam water radio measuring instrument according to claim 1, it is characterized in that, in described coal seam water radio measuring instrument, each parts all are placed in the drip-proof type sealing metal shell that has the metal-coated membrane glass window with the airtight shielding of the silver-plated shell of bilayer separately afterwards altogether except antenna sets, and antenna sets is introduced antidrip sealing metal shell with the flame-proof explosion-proof cable by sealing adaptor.

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