CN203490168U - Fiber-distributed multi-point online gas monitoring system and host thereof - Google Patents
Fiber-distributed multi-point online gas monitoring system and host thereof Download PDFInfo
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- CN203490168U CN203490168U CN201320550748.XU CN201320550748U CN203490168U CN 203490168 U CN203490168 U CN 203490168U CN 201320550748 U CN201320550748 U CN 201320550748U CN 203490168 U CN203490168 U CN 203490168U
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Abstract
The utility model discloses a fiber-distributed multi-point online gas monitoring system and a host thereof. The fiber-distributed multi-point online gas monitoring system comprises the host and monitoring probes, wherein the monitoring probes are distributed on all monitoring points; the host is internally provided with a laser; the output end of the laser is connected with the input ends of output optical switches; the output ends of the output optical switches are connected to all corresponding monitoring probes by input fiber; all the monitoring probes are connected to the corresponding input ends of input optical switches arranged in the host by output optical fiber; the output ends of the input optical switches are connected with an infrared photoelectric detector; the host is also internally provided with a control module for controlling gates of the output optical switches and the input optical switches to set corresponding optical paths of the monitoring probes. The fiber-distributed multi-point online gas monitoring system and the host disclosed by the utility model have the advantages that the host adopts the optical switches to realize time division multiplex access of the laser, and under the condition of the equal-power lasers, optical-fiber sensors can be distributed in a farther manner; in addition, single infrared photoelectric sensor only needs to be arranged behind the output optical switches, so that the cost is reduced.
Description
Technical field
The utility model relates to the online gas monitoring system of a kind of optical fiber distributed type multiple spot and main frame thereof.
Background technology
Methane gas control in Safety of Coal Mine Production process is the most important thing.Using traditionally and first taking out the method for adopting is afterwards the plan of taking precautions against methane gas accident and improving the guarantee of Safety of Coal Mine Production operation.In addition, the gas harmful gas coming in the extraction production of can generating electricity, this will carry out very large economic interests by coal supply mine belt.
, in the extraction process of methane gas, need to carry out real-time on-line monitoring to methane gas concentration.Domestic many mines have been set up the monitoring system of methane concentration now, and the network structure of Dou Shi branch tree type arranges main website of control center in coal mine substantially, and scene, down-hole arranges a plurality of observing and controlling substations.Substation Information Monitoring also sends main website to, sends corresponding control command after main website process information, by substation, is received and is carried out.The transmission of information and order between main website and substation, by laying private cable, adopts the technology such as RS485, PSK, FSK, by the private communication protocol of stipulating separately, realizes.At substation to the methane information between sensor, rely on private cable, adopt the simulating signal of 4～20mA or 200～1000Hz to transmit, exist sensor life-time short, need frequent adjustment, measurement range little, access dumb, realize the shortcomings such as distribution that follow-up is inconvenient, cannot reflect workplace methane spatial gradient.
The online gas monitoring system of existing many monitoring points is all arranged monitoring instrument or sensor in each monitoring point, measures the gas parameter of monitoring point, analyze data and by communication cable by data transfer to system host or server.These monitoring instruments or sensor generally comprise: measure sensitive element, signal processing unit, data analysis unit, signal transmitting transmission unit etc., so ubiquity system forms the problems such as complicated, cost input is excessive, failure rate is high.
Past 10 years was laser spectrum detection technique for environmental monitoring and the most successful technology of industrial gasses process control, and it can provide quite high accuracy of detection, was combined with optical fiber sensing technology, became a kind of distribution type laser gas absorption spectra detection technique.This technology can provide the long distance of gas, online, real-time detection, makes the application under severe engineering-environment become possibility, aspect safety monitoring and space flight and nuclear industry field have fabulous application prospect.
In recent years, along with the develop rapidly of optical fiber sensing technology and Networks of Fiber Communications technology, utilize fibre ribbon roomy, be easy to feature into the net, form a multiplexing optical fiber multi-point sensing network system, become one of sensing Study of An field the hottest on our times.The newest fruits of photoelectron technology and Material Field is applied to methane and detects research, non-maintaining, anti-interference, the highly sensitive methane detection system of development a new generation, is up-to-date research trend in the world at present.Adopt fiber multiplex, make a plurality of sensors share the cost that a Transmission Fibers and light source can reduce whole system greatly, and system networking facilitated the maintenance management of system, for optical fiber gas sensing system is moved towards the practical brand-new road of having opened up.
Tunable diode laser absorption spectroscopy technology (being called for short TDLAS technology) is exactly the gas detection technology growing up on above-mentioned achievement in research basis, its principle is as follows: material has different absorptions to the electromagnetic wave of different frequency, therefore absorption line can be used as " fingerprint " of identification gas with various molecule, determines composition and the concentration of molecule according to the position of absorption line and intensity.Because the organic and inorganic pollution composition of majority all has Absorption Line at visible and infrared band, utilize these Absorption Lines can the various pollutant components of quantitative test.TDLAS technology is usingd semiconductor laser with tunable as light source, there is very high spectral resolution and tunability, utilize these features to gas molecule to be measured the spectral absorption that turns line of shaking of in this spectral range measure, thereby realize the detection of gas concentration.
Chinese Patent Application No. 200810100549.2 discloses a kind of optical fibre distributed multi-point mash gas real-time monitor and monitoring method, this monitor has just adopted above-mentioned TDLAS technology, simultaneously, in order to monitor a plurality of monitoring points, adopted optical fiber splitter to carry out shunt transmission to laser, and corresponding each monitoring point return to optical fiber, be equipped with an infrared photoelectric detector, each infrared photoelectric detector is for surveying the spectral information that corresponding monitoring point is returned.This scheme is owing to laser having been carried out to processing along separate routes, the distance of its transmission decreases, and can only realize short-range distributed points monitoring, and each input interface at optical fiber splitter will arrange an infrared photoelectric detector when returning to main frame, cost is higher, controls and uses also comparatively complexity.
Utility model content
The purpose of this utility model is to provide the online gas monitoring system of a kind of optical fiber distributed type multiple spot, short and control complicated problem to solve existing monitoring system monitoring distance, provides a kind of optical fiber distributed type multiple spot online gas monitoring system main frame simultaneously.
In order to realize above object, the technical scheme that the online gas monitoring system of the utility model optical fiber distributed type multiple spot adopts is: the online gas monitoring system of a kind of optical fiber distributed type multiple spot, comprise main frame and be distributed in the monitoring probe of each monitoring point, in described main frame, laser instrument is installed, the output terminal of described laser instrument is connected in the input end of 1*N road output photoswitch, the N road output terminal of 1*N road output photoswitch is connected to each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the corresponding input end in N road of the 1*N input optical switch arranging in main frame by output optical fibre, the output terminal of 1*N input optical switch is connected with infrared photoelectric detector, in this main frame, be also provided with for controlling the control module of 1*N road output photoswitch and 1*N input optical switch strobe sets monitoring probe respective optical path.
Described control module shows by this locality of establishing in Transmission Fibers and each monitoring probe and alarm unit communicates to connect.
Described Transmission Fibers show with this locality of establishing in control module and monitoring probe and alarm unit between be equipped with corresponding fiber optical transceiver.
In described main frame, be also provided with main display module and for the communication interface with mining substation communication connection.
Described control module adopts fpga chip.
The technical scheme that the online gas monitoring system main frame of the utility model optical fiber distributed type multiple spot adopts is: the online gas monitoring system main frame of a kind of optical fiber distributed type multiple spot, the laser instrument of establishing in comprising, the output terminal of described laser instrument is connected in the input end of 1*N road output photoswitch, the N road output terminal of 1*N road output photoswitch is for being connected to each corresponding monitoring probe by input optical fibre, for the light signal from the output of each monitoring probe, by output optical fibre, be connected to the corresponding input end in N road of the 1*N input optical switch that main frame arranges, the output terminal of 1*N input optical switch is connected with infrared photoelectric detector, in this main frame, be also provided with for controlling the control module of 1*N road output photoswitch and 1*N input optical switch strobe sets monitoring probe respective optical path.
In described main frame, be also provided with main display module and for the communication interface with mining substation communication connection.
Described control module adopts fpga chip.
Main frame of the present utility model is different according to monitoring point quantity, utilize the timesharing of 1*N input optical switch to send one or more laser to each air chamber of sampling, and utilize 1*N output photoswitch to receive the laser returning from each sampling air chamber, adopt photoswitch to realize the time-sharing multiplex of laser, under the condition of Same Efficieney laser instrument, Fibre Optical Sensor can distribute fartherly; In addition, only single infrared photoelectric sensor need to after exporting photoswitch, 1*N be set, reduced cost, and be easy to expansion for the absorption of other gas, particularly LONG WAVE INFRARED absorbs, because simple detector can adopt the detector that needs refrigeration, if multidetector,, due to cost and complexity, be difficult to adopt.This monitoring system can be under coal mine, mine, plant working area monitoring multiple spot gas parameter, and cost is lower, stable and reliable for performance, and mentality of designing is novel, rationally, is convenient to on-the-spot installation, easy to use.
Accompanying drawing explanation
Fig. 1 is the topological diagram of the online gas monitoring system of the utility model optical fiber distributed type multiple spot;
Fig. 2 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.
Be illustrated in figure 1 the topological diagram of the online gas monitoring system of the utility model optical fiber distributed type multiple spot, this system comprises main frame and for being distributed in the monitoring probe of each monitoring point, this main frame is arranged on apart from each monitoring point close together, and the convenient position of installing, safeguarding, and in monitoring probe, be provided with corresponding gas sampling assembly (gas sampling assembly of the present embodiment for sampling air chamber), and distributing installation is in the place of needs monitorings, tested gas can free in and out sampling air chamber; Between each sample air chamber and main frame, with optical fiber, be connected.
Be illustrated in figure 2 the online gas monitoring system example structure of optical fiber distributed type multiple spot schematic diagram, as seen from the figure, semiconductor laser and control module are installed in main frame, semiconductor laser is as the detection laser light source of gas to be measured, utilize laser control circuit by laser instrument output center wavelength be tuned to the Absorption Line center of gas to be measured, when work, first select the temperature working point of laser instrument, laser tube core temperature is controlled on this working point, then to laser, apply steady current, laser instrument can be launched the modulated laser that a branch of light intensity is constant.
The output terminal of semiconductor laser is connected in the input end of 1*N road output photoswitch, the N road output terminal of 1*N road output photoswitch is connected to the sampling air chamber of establishing in each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the corresponding input end in N road of the 1*N input optical switch arranging in main frame by output optical fibre, the output terminal of 1*N input optical switch is connected with infrared photoelectric detector; In this main frame, be also provided with for controlling the control module of 1*N road output photoswitch and 1*N input optical switch strobe sets monitoring probe respective optical path.
The emergent light of semiconductor laser is transferred to the input end of 1*N road output photoswitch, the N road Output of laser of exporting from each output terminal of output photoswitch is transferred to the sampling air chamber of establishing in each corresponding monitoring probe by input optical fibre, the N passage of control module Dui1*N road output photoswitch adopts the scan period of setting-up time to scan, and the N road timesharing that realizes laser in monitoring system detects.At laser, enter after corresponding sampling air chamber, optical maser wavelength is inswept, and gaseous absorption line to be measured forms flashlight, the N road return signal light of crossing through gas absorption to be measured passing from sampling air chamber transmits back the corresponding input end of the 1*N input optical switch arranging main frame by output optical fibre, 1*N input optical switch He1*N road output photoswitch channel selecting is synchronous, and order detects the back light signal gating of light path to the output terminal of 1*N input optical switch by each.The flashlight of exporting from the output terminal of 1*N input optical switch is received by an infrared photoelectric detector, convert electric signal and preposition amplification, filtering to, and (concentration of second harmonic amplitude and tested gas is linear by lock-in amplifier, to realize second-harmonic detection, gas concentration is higher, the absorbed degree of laser is larger), adopt the gas to be measured of concentration known to demarcate, can realize the measurement to gas concentration to be measured in the air of monitoring point; Detect the first harmonic of infrared photoelectric detector output signal simultaneously, by calculating the ratio of second harmonic and first harmonic, can eliminate the impact that light source intensity rises and falls.
The utility model adopts photoswitch, rather than optical fiber splitter, by the mode of time-sharing multiplex: at synchronization, by controlling two photoswitches, make the corresponding light path of two certain monitoring probes of photoswitch synchronous selection pass, so that light path information corresponding to this monitoring probe is detected to analysis.Which can not weaken light intensity, so long transmission distance, under the condition of Same Efficieney laser instrument, Fibre Optical Sensor can distribute fartherly; In addition, only single infrared photoelectric sensor need to be set after 1*N exports photoswitch, reduce cost.
Control module in main frame adopts fpga chip to realize, and has compact conformation, the advantage of dependable performance, and main frame, according to the parameter calibration value of heterogeneity gas before dispatching from the factory, is analyzed gas componant parameter in each monitoring point sampling air chamber, and is shown.Concentration software for calculation is installed in control module, by secondary and the first harmonic signal of the laser absorption signal of lock-in amplifier output are processed, obtains each monitoring point gas concentration information to be measured, by main display module, at main frame place, shown; Concentration information is shown and alarm unit by passing to this locality of establishing in corresponding monitoring probe under the fiber optical transceiver of establishing in Transmission Fibers and main frame and monitoring probe simultaneously, this this locality shows and alarm unit comprise transfinite discrimination module and with audible alarm module and local demonstration and the light alarm module of its control linkage, realize differentiation and local sound and light alarm that concentration transfinites, the work habit that meets field personnel has compatibility with traditional monitoring system in using method.
The optical fiber of the present embodiment has three effects: the one, and the narrow-linewidth laser that laser instrument is sent transfers to distributed sample air chamber from main frame; The 2nd, by the Laser Transmission after sampling air chamber absorbs to main frame; The 3rd, each distributed points methane concentration information that main frame is measured, reaches each distributed monitoring probe under the form with light signal, and realizing local concentration transfinites and differentiate and sound and light alarm.Adopt optical fiber to replace cable transmission signal, have and utilize the intrinsic safety that improves product, effectively reduce costs.
The distributed monitoring probe of the present embodiment adopts powered battery, adopts low power laser instrument, and system host power consumption is little, and main frame can meet system requirements by low power intrinsic safety electric source module 1 power supply.
Main frame has simulating signal, digital signal output function, the measurement data of each monitoring point can be uploaded to all kinds of supervisory systems of far-end by equipment such as mining monitoring substation, ring exchangers.The main frame of the present embodiment is realized message exchange by a group communication interface and substation, main frame and mining monitoring substation adopt a RS485 interface, RJ45 100-M network Ethernet and 200-1000Hz frequency signal interface to be connected, and realize the message exchange between main frame and substation.
The utility model also provides a kind of optical fiber distributed type multiple spot online gas monitoring system main frame, and its structure as mentioned above.
In addition, the laser current of noise spectra of semiconductor lasers carries out high frequency modulated, can coordinate lock-in amplifier to realize Detection of Weak Signals.At laser, enter after sampling air chamber, adopt optical fiber collimator that semiconductor laser is become to collimated light beam, the suitable number of times of turning back in sampling air chamber, reaches suitable light path, is then coupled in output optical fibre, passes main frame back.
Claims (8)
1. the online gas monitoring system of optical fiber distributed type multiple spot, comprise main frame and be distributed in the monitoring probe of each monitoring point, in described main frame, laser instrument is installed, it is characterized in that: the output terminal of described laser instrument is connected in the input end of 1*N road output photoswitch, the N road output terminal of 1*N road output photoswitch is connected to each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the corresponding input end in N road of the 1*N input optical switch arranging in main frame by output optical fibre, the output terminal of 1*N input optical switch is connected with infrared photoelectric detector; In this main frame, be also provided with for controlling the control module of 1*N road output photoswitch and 1*N input optical switch strobe sets monitoring probe respective optical path.
2. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 1, is characterized in that: described control module shows by this locality of establishing in Transmission Fibers and each monitoring probe and alarm unit communicates to connect.
3. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 2, is characterized in that: described Transmission Fibers show with this locality of establishing in control module and monitoring probe and alarm unit between be equipped with corresponding fiber optical transceiver.
4. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 3, is characterized in that: in described main frame, be also provided with main display module and for the communication interface with mining substation communication connection.
5. according to the online gas monitoring system of optical fiber distributed type multiple spot described in claim 3 or 4, it is characterized in that: described control module adopts fpga chip.
6. the online gas monitoring system main frame of optical fiber distributed type multiple spot, the laser instrument of establishing in comprising, it is characterized in that: the output terminal of described laser instrument is connected in the input end of 1*N road output photoswitch, the N road output terminal of 1*N road output photoswitch is for being connected to each corresponding monitoring probe by input optical fibre, for the light signal from the output of each monitoring probe, by output optical fibre, be connected to the corresponding input end in N road of the 1*N input optical switch that main frame arranges, the output terminal of 1*N input optical switch is connected with infrared photoelectric detector; In this main frame, be also provided with for controlling the control module of 1*N road output photoswitch and 1*N input optical switch strobe sets monitoring probe respective optical path.
7. the online gas monitoring system main frame of optical fiber distributed type multiple spot according to claim 6, is characterized in that: in described main frame, be also provided with main display module and for the communication interface with mining substation communication connection.
8. according to the online gas monitoring system main frame of the optical fiber distributed type multiple spot described in claim 6 or 7, it is characterized in that: described control module adopts fpga chip.
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| CN201320550748.XU CN203490168U (en) | 2013-09-05 | 2013-09-05 | Fiber-distributed multi-point online gas monitoring system and host thereof |
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| CN201320550748.XU CN203490168U (en) | 2013-09-05 | 2013-09-05 | Fiber-distributed multi-point online gas monitoring system and host thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454243A (en) * | 2013-09-05 | 2013-12-18 | 郑州光力科技股份有限公司 | Optical fiber distribution type multi-point online gas monitoring system and main engine thereof |
| CN107706703A (en) * | 2017-09-30 | 2018-02-16 | 维沃移动通信有限公司 | A kind of laser optical path control method, device and mobile terminal |
| CN109781253A (en) * | 2019-01-24 | 2019-05-21 | 中国科学院理化技术研究所 | A kind of light beam synchronizing detection device |
| CN109991188A (en) * | 2018-01-02 | 2019-07-09 | 中兴通讯股份有限公司 | Gas detection method and device |
-
2013
- 2013-09-05 CN CN201320550748.XU patent/CN203490168U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454243A (en) * | 2013-09-05 | 2013-12-18 | 郑州光力科技股份有限公司 | Optical fiber distribution type multi-point online gas monitoring system and main engine thereof |
| CN107706703A (en) * | 2017-09-30 | 2018-02-16 | 维沃移动通信有限公司 | A kind of laser optical path control method, device and mobile terminal |
| CN107706703B (en) * | 2017-09-30 | 2019-07-26 | 维沃移动通信有限公司 | A kind of laser optical path control method, device and mobile terminal |
| CN109991188A (en) * | 2018-01-02 | 2019-07-09 | 中兴通讯股份有限公司 | Gas detection method and device |
| CN109781253A (en) * | 2019-01-24 | 2019-05-21 | 中国科学院理化技术研究所 | A kind of light beam synchronizing detection device |
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Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: GLTECH Co.,Ltd. Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: ZHEJIANG GUANGLI TECH DEVELOPMENT Co.,Ltd. |
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