CN101539631B - Earthquake monitoring device - Google Patents
Earthquake monitoring device Download PDFInfo
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- CN101539631B CN101539631B CN2009100618342A CN200910061834A CN101539631B CN 101539631 B CN101539631 B CN 101539631B CN 2009100618342 A CN2009100618342 A CN 2009100618342A CN 200910061834 A CN200910061834 A CN 200910061834A CN 101539631 B CN101539631 B CN 101539631B
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Abstract
The invention discloses an earthquake monitoring device. The device consists of a central control terminal and a sensor probe under ground, wherein, a light pulse signal is generated from a light source part of the central control terminal, transmitted to the underground sensor probe in an deep ground environment over an optical fiber, then the light pulse signal is changed into 3 discrete modulated pulse signals in time domain after being vibrated, strained and temperature-modulated in the probe in the deep ground, and the modulated pulse signals return to an information demodulation section of the central control terminal for photoelectric conversion, amplification, data processing to complete demodulation, thus realizing real-time monitoring and alarming of parameters of vibration, strain and temperature in the deep ground. The device has the advantages of low production cost, simple installation, high accuracy and good practicability, being convenient to form a network of stations, and realizing stereoscopic multiparameter monitoring on the deep ground environment in a large range.
Description
Technical field
The present invention relates to monitoring device, particularly a kind of device that is used for seismic monitoring.
Background technology
China is positioned at the position that crosses of two violent earthquake band-circum-Pacific seismic zones, the world and Eurasian seismic zone, is subjected to the extruding of Pacific-oceanic plate, Indian Ocean plate and Philippine Sea plate, and the earthquake zone of fracture is very complicated, and the frequent earthquake calamity of macrotectonics determining positions earthquake is serious.The Wenchuan earthquake that on May 12nd, 2008 took place has shaken each Chinese soul, also supervises the scientific worker to promote development in science and technology better, faster, is the protection against and mitigation of earthquake disasters work service.
Traditional earthquake alarming device is made up of vibration or displacement transducer, and early warning is carried out in buildings will take place when sensing earthquake by vibration or displacement transducer vibration or deformation, and there is following shortcoming in this traditional earthquake alarming device:
1. to the environmental requirement height.Common seismic event monitoring instrument poor anti jamming capability, as long as just have high-intensity magnetic field or electric field to disturb and can report by mistake, want and can accurately measure, requirement is contained in it in zones high to environmental requirement such as cavern.
2. violent earthquake is offscale.Common seismic event monitoring instrument frequency band is narrow, and the violent earthquake phenomenon that temporarily acts improperly is general, promptly after earthquake is greater than certain rank, can't distinguish magnitude of earthquake on seismograph.
And in the earthquake precursors monitoring, its realization means rely on various omen instruments, can realize the earthquake precursors parameter as pantograph, inclinator, gravity meter, drilling strain gauge etc., but ubiquity apparatus expensive all, to the environmental requirement height, bad adaptability is difficult for installing, be difficult to realize the large tracts of land networking, also be difficult to large tracts of land, the stereoscopic monitoring of realization earthquake.
Summary of the invention
Technical matters to be solved by this invention is: for solving above-mentioned prior art problem, provide that a kind of adaptability is strong, multiparameter and high-precision seismic monitoring device.
The present invention solves the technical scheme that its technical matters adopts: by central control terminal be positioned at underground sensing probe and form.Wherein: the light pulse signal that the Lights section of central control terminal sends, through an Optical Fiber Transmission to being arranged in the underground sensing probe of environment deeply, then in described probe by after vibration deeply, strain and the temperature modulation, become discrete modulated pulse signal on three time domains, these modulated pulse signals turn back to the demodulates information of central control terminal and partly carry out opto-electronic conversion, amplification and data processing, finish demodulation, thereby realize the real-time monitoring and the warning of vibration deeply, strain and temperature parameters.Described the Lights section is provided with distributed feedback semiconductor narrow band laser, photo-coupler, image intensifer and circulator, and they link to each other successively by optical fiber.Central authorities' control terminal is provided with the wide range lasing light emitter, it is linked to each other with a photo-coupler by optical fiber, two output terminals of this photo-coupler link to each other with the input end of two gratings, the output terminal of two gratings by optical fiber with after another photo-coupler links to each other, link to each other with another photo-coupler through optical fiber, this photo-coupler links to each other with image intensifer through optical fiber again.
Seismic monitoring device provided by the invention, it compared with prior art has following main advantage:
One. adopt wavelength-division, time-division, space division multiplexing technology: this device can be realized the real-time measurement of vibration, temperature, strain simultaneously by wavelength-division, time-division, empty branch technology on an optical fiber, the integrated level height, adaptability is strong.
They are two years old. and adopt multifunctional optical fiber passive sensing head, antijamming capability is strong, and adaptability is strong, can be used for long-range down-hole sensing.
They are three years old. and adopt phase modulation technique: phase modulation technique is owing to having adopted interference technique to have very high detection sensitivity.If signal detection system can detect the phase shift of μ rad, so the detection sensitivity of every meter optical fiber is 10 corresponding to pressure
-7Pa.
They are four years old. and adopt temperature sensitive grating to realize the high-precision temperature sensing in conjunction with binary channels edge filter method, detection sensitivity is 0.01 ℃ for temperature.
They are five years old. and adopt pressure-sensitive grating to realize the high precision strain sensing in conjunction with binary channels edge filter method, detection sensitivity is 0.1 μ ε for strain.
They are six years old. and adopt system software that signal is carried out frequency domain transform, do simple event analysis, the system that remedied does not have the defective of video image, and output alarm interlock signal automatically.Whole process need not manual intervention, so the system automation degree is very high.
They are seven years old. low cost of manufacture, be easy to install, the precision height, practical, be easy to form the platform net, thereby can realize to deeply on a large scale, three-dimensional monitoring.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Among the figure: 1. distributed feedback semiconductor narrow band laser (DFB-LD); 2. wide range lasing light emitter (LD); 3. photo-coupler; 4. grating; 5. image intensifer; 6. circulator; 7. time-delay is fine; 8. sensing grating; 9. comb filter; 10. photoelectricity high speed detector; 11. signal amplifier; 12. analog to digital converter; 13.PC terminal; 14. optical fiber; 15. reflective M-Z interferometer.
Embodiment
Seismic monitoring device provided by the invention, it is by central control terminal and be positioned at underground sensing probe and form.Wherein: the light pulse signal that the Lights section of central control terminal sends, through an Optical Fiber Transmission to being arranged in the underground sensing probe of environment deeply, then in described probe by after vibration deeply, strain and the temperature modulation, become discrete modulated pulse signal on three time domains, these modulated pulse signals turn back to the demodulates information of central control terminal and partly carry out opto-electronic conversion, amplification and data processing, finish demodulation, thereby realize the real-time monitoring and the warning of vibration deeply, strain and temperature parameters.
Above-mentioned central control terminal, it partly is made up of the Lights section and demodulates information, concrete structure as shown in Figure 1: the Lights section is provided with distributed feedback semiconductor narrow band laser 1, photo-coupler, image intensifer 5 and circulator 6, and they link to each other successively by optical fiber.Be provided with wide range lasing light emitter 2, it is linked to each other with photo-coupler by optical fiber, two output terminals of photo-coupler link to each other with the input end of two gratings 4, the output terminal of two gratings 4 by optical fiber with after a photo-coupler links to each other, link to each other with another photo-coupler through optical fiber, this photo-coupler links to each other with image intensifer 5 through optical fiber again.Demodulates information partly is provided with PC terminal 13, it links to each other with the output terminal of optical fiber with analog to digital converter 12, the input end of this analog to digital converter is linked to each other with the output terminal of two signal amplifiers 11 respectively by optical fiber, each links to each other with the output terminal of a photoelectricity high speed detector 10 input end of two signal amplifiers by data line, the input end of one of them photoelectricity high speed detector links to each other with a photo-coupler after being linked to each other with comb filter 9 by optical fiber, this photo-coupler is linked to each other by the input end of optical fiber with another photoelectricity high speed detector, and this photo-coupler is linked to each other with circulator 6 by optical fiber.Among Fig. 1, numbering 3 is a photo-coupler, and numbering 14 is an optical fiber.
Described demodulates information part can adopt two kinds of methods of phase demodulating and Wavelength demodulation that the modulated pulse signal that returns is deeply carried out demodulation.
The centre wavelength of described two gratings 4 is unequal, and the centre wavelength of two sensing gratings 8 is unequal, and wherein: the centre wavelength of a grating 4 equates that with the centre wavelength of a sensing grating 8 for example, their centre wavelength is 1552.28nm.The centre wavelength of another grating 4 equates that with the centre wavelength of another sensing grating 8 for example, their centre wavelength is 1545.74nm.
Described environment deeply is meant the boring of being bored by rig.
Above-mentioned underground sensing probe, its structure is as shown in Figure 1: be provided with sensing grating 8 and reflective M-Z interferometer 15, sensing grating 8 by optical fiber with after a photo-coupler links to each other, link to each other with another photo-coupler through optical fiber again, this photo-coupler is linked to each other with circulator 6 by optical fiber, and its another output terminal links to each other with reflective M-Z interferometer 15.It is fine 7 to be provided with many time-delays, they be distributed in sensing grating 8 and optical fiber that reflective M-Z interferometer 15 links to each other on.
Above-mentioned underground sensing probe, it can adopt vibration integrated, the sensor of temperature, strain multiparameter sensing technology, wherein: strain transducer and, the BGK-FBG-4150 that strain transducer can adopt the Beijing JiKang Science Co., Ltd to produce, the BGK-FBG-4700S that temperature sensor adopts the Beijing JiKang Science Co., Ltd to produce.
Above-mentioned demodulating equipment is phase demodulating, binary channels Wavelength demodulation device.Demodulating equipment is connected to the PC terminal.The PDCS985 that photoelectricity high speed detector 10 in the demodulating equipment adopts Wuhan Telecommunication Device Co (WTD) to produce.
Above-mentioned PC terminal 13, it has the visualization applications of writing with labview: can real time record parameter information; Can provide measurement data and waveform with close friend's graphical interfaces shows; Can compare in real time with the threshold value that sets, if any unusually promptly sending alerting signal.
Seismic monitoring device provided by the invention can utilize rig boring that it is delivered to the point that will carry out seismic monitoring.Like this, the vibration of monitoring point, temperature, strain information can produce modulating action to optical wavelength, the phase place of transmitting in the underground sensing probe.Light wave after the modulation returns central control terminal by light path, and the demodulating equipment by central control terminal can demodulate vibration, temperature and strain signal.
The concrete workflow of the present invention is: wide range lasing light emitter 2 obtains two operating wave end pulse-modulated signals through grating 4, with the monochromatic light signal of distributed feedback semiconductor narrow band laser 1 output, through image intensifer 5, obtains necessarily gain.Through an optical fiber, import underground sensing probe into from central control terminal.15 and two sensing gratings of reflective M-Z interferometer (reflective Mach-Zehnder interferometer) 8 are used for surveying deeply in conjunction with constituting the compound underground sensing probe of many reference amounts, respectively vibration, temperature and strain are realized high-precision real-time monitoring.The vibration of monitoring point, temperature, strain information can produce modulating action to optical wavelength, the phase place of transmitting in the multi-functional underground sensing probe.Light wave after the modulation returns by light path.Time-delay fibre 7 in the underground sensing probe makes three transducing signals separately form three modulated pulse signals in time domain.Two photoelectricity high speed detector 10 receive and have carried the return signal light of heat transfer agent, utilize binary channels edge filter method to demodulate the variation of signal wavelength by the light-filtering characteristic of the linear edge part of comb filter 9 respectively three discrete moment, variation demodulates vibration information according to signal light intensity, record the information of vibration, temperature and strain respectively in the different moment according to flashlight, fluctuating influence when so not only having eliminated radiation of light source, and eliminated the instability that parasitic light causes to a certain extent.Gather the photoelectricity inverted signal by the Dual-Channel High-Speed Data Acquisition card, and in PC terminal 13, carry out data processing and visualized graphs interface display, the software major function comprises: the dynamic data setting of sensitivity adjusting, parameter and waveform show and send early warning signal.
Claims (8)
1. seismic monitoring device, it is by central control terminal and be positioned at underground sensing probe and form, the light pulse signal that the Lights section of central authorities' control terminal sends, through an Optical Fiber Transmission to being arranged in the underground sensing probe of environment deeply, in described probe, vibrated deeply then, after strain and the temperature modulation, become discrete modulated pulse signal on three time domains, these modulated pulse signals turn back to the demodulates information of central control terminal and partly carry out opto-electronic conversion, amplify and data processing, finish demodulation, thereby realize vibrating deeply, the real-time monitoring and the warning of strain and temperature parameters is characterized in that:
Described the Lights section is provided with distributed feedback semiconductor narrow band laser (1), photo-coupler, image intensifer (5) and circulator (6), and they link to each other successively by optical fiber;
Central authorities' control terminal is provided with wide range lasing light emitter (2), it is linked to each other with a photo-coupler by optical fiber, two output terminals of this photo-coupler link to each other with the input end of two gratings (4), the output terminal of two gratings (4) by optical fiber with after another photo-coupler links to each other, link to each other with another photo-coupler through optical fiber, this photo-coupler links to each other with image intensifer (5) through optical fiber again.
2. seismic monitoring device according to claim 1, it is characterized in that: described demodulates information partly is provided with PC terminal (13), it links to each other with the output terminal of optical fiber with analog to digital converter (12), the input end of this analog to digital converter is linked to each other with the output terminal of two signal amplifiers (11) respectively by optical fiber, each links to each other with the output terminal of a photoelectricity high speed detector (10) input end of two signal amplifiers by data line, the input end of one of them photoelectricity high speed detector links to each other with a photo-coupler after being linked to each other with comb filter (9) by optical fiber, this photo-coupler is linked to each other by the input end of optical fiber with another photoelectricity high speed detector, and this photo-coupler is linked to each other with circulator (6) by optical fiber.
3. seismic monitoring device according to claim 2 is characterized in that: demodulates information partly adopts phase demodulating and two kinds of methods of Wavelength demodulation that the modulated pulse signal that returns is deeply carried out demodulation.
4. seismic monitoring device according to claim 1, it is characterized in that: described underground sensing probe, be provided with sensing grating (8) and reflective M-Z interferometer (15), sensing grating (8) by optical fiber with after a photo-coupler links to each other, link to each other with another photo-coupler through optical fiber again, this photo-coupler is linked to each other with circulator (6) by optical fiber, and another output terminal of this photo-coupler links to each other with reflective M-Z interferometer (15); Be provided with many time-delays fine (7), they be distributed in sensing grating (8) and optical fiber that reflective M-Z interferometer (15) links to each other on.
5. according to claim 1 or 4 described seismic monitoring devices, it is characterized in that: the centre wavelength of described two gratings (4) is unequal, the centre wavelength of two sensing gratings (8) is unequal, the centre wavelength of one of them grating (4) equates that with the centre wavelength of a sensing grating (8) centre wavelength of another grating (4) equates with the centre wavelength of another sensing grating (8).
6. seismic monitoring device according to claim 5 is characterized in that: the centre wavelength of the centre wavelength of a described grating (4) and a sensing grating (8) is 1552.28nm.
7. seismic monitoring device according to claim 5 is characterized in that: the centre wavelength of the centre wavelength of described another grating (4) and another sensing grating (8) is 1545.74nm.
8. seismic monitoring device according to claim 1, it is characterized in that: environment is meant boring deeply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009100618342A CN101539631B (en) | 2009-04-30 | 2009-04-30 | Earthquake monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100618342A CN101539631B (en) | 2009-04-30 | 2009-04-30 | Earthquake monitoring device |
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| CN101539631A CN101539631A (en) | 2009-09-23 |
| CN101539631B true CN101539631B (en) | 2011-11-30 |
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| CN2009100618342A Expired - Fee Related CN101539631B (en) | 2009-04-30 | 2009-04-30 | Earthquake monitoring device |
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