CN103454243B9 - A kind of online gas monitoring system of optical fiber distributed type multiple spot and its main frame - Google Patents
A kind of online gas monitoring system of optical fiber distributed type multiple spot and its main frame Download PDFInfo
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- CN103454243B9 CN103454243B9 CN201310400196.9A CN201310400196A CN103454243B9 CN 103454243 B9 CN103454243 B9 CN 103454243B9 CN 201310400196 A CN201310400196 A CN 201310400196A CN 103454243 B9 CN103454243 B9 CN 103454243B9
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Abstract
The invention discloses a kind of online gas monitoring system of optical fiber distributed type multiple spot and its main frame, popped one's head in including main frame and the monitoring for being distributed in each monitoring point, laser is installed in main frame, the output end of laser is connected to the input of input optical switch, the output end of input optical switch is connected to each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the corresponding input of the output photoswitch set in main frame by output optical fibre, and the output end for exporting photoswitch is connected with infrared photoelectric detector；The control module for controlled output photoswitch and input optical switch strobe sets monitoring probe respective optical path is additionally provided with the main frame.Main frame of the invention realizes the time-sharing multiplex of laser using photoswitch, and under conditions of Same Efficieney laser, Fibre Optical Sensor can be distributed farther；In addition, it is only necessary to single infrared photoelectric sensor is set after photoswitch is exported, cost is reduced.
Description
Technical field
The present invention relates to a kind of online gas monitoring system of optical fiber distributed type multiple spot and its main frame.
Background technology
Methane gas preventing and treating during Safety of Coal Mine Production is the most important thing.It is conventionally used first to take out the plan that the method adopted afterwards is the guarantee taken precautions against methane gas accident and improve Safety of Coal Mine Production operation.In addition, the gas pernicious gas come in extraction can carry out generating production, this will bring very big economic interests to colliery.
But, it is necessary to be monitored on-line in real time to methane gas concentration during the extraction of methane gas.Present domestic many mines have been set up the monitoring system of methane concentration, are essentially all the network structure of branch's tree-shaped, and main website of control centre is set in coal mine, and underground site sets multiple observing and controlling substations.Substation gathers information and sends main website to, and corresponding control command is sent after main website processing information, is received by substation and is performed.The transmission of information and order between main website and substation, by laying private cable, using technologies such as RS485, PSK, FSK, is realized by the private communication protocol of respective regulation.In substation to the methane information between sensor, by private cable, transmitted using the analog signal of 4~20mA or 200~1000Hz, have that sensor life-time is short, need frequent adjustment, measurement range is small, accesss is dumb, the shortcomings of realize follow-up inconvenience, the distribution of working face methane spatial gradient cannot be reflected.
The online gas monitoring system of existing many monitoring points arranges monitoring instrument or sensor in each monitoring point, measures the gas parameter of monitoring point, and analyze data simultaneously passes through communication cable by data transfer to system host or server.These monitoring instruments or sensor are generally comprised：Measurement sensing element, signal processing unit, data analysis unit, signal transmitting transmission unit etc., so the problems such as generally existing system composition is complicated, cost input is excessive, fault rate is high.
It is laser spectrum detection technique that past 10 years was used for environmental monitoring and the most successful technology of industrial gasses process control, and it can provide at a relatively high accuracy of detection, be combined with optical fiber sensing technology, as a kind of distribution type laser gas absorption spectra detection technique.This technology can provide the long range of gas, online, real-time detection so that the application under severe engineering-environment is possibly realized, in terms of safety monitoring and there is fabulous application prospect in space flight and nuclear industry field.
In recent years, developing rapidly with optical fiber sensing technology and Networks of Fiber Communications technology, using fibre ribbon it is roomy, be easy to feature into the net, constitute an optical fiber multi-point sensing network system for multiplexing, it has also become one of sensing Study of An field most hot on our times.The newest fruits of photoelectron technology and Material Field are applied to CH_4 detection research, non-maintaining, anti-interference, the highly sensitive CH_4 detection system of development a new generation is research trend newest in the world at present.Using fiber multiplex, allow that multiple sensors share a Transmission Fibers and light source substantially reduces the cost of whole system, and system networking facilitates the maintenance management of system, be that optical fiber gas sensing system move towards practical and opens brand-new road.
Tunable diode laser absorption spectroscopy technology (abbreviation TDLAS technologies) is exactly the gas detection technology grown up on the studies above performance basis, and 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, and position and intensity according to absorption line determine the composition and concentration of molecule.Because most organic and inorganic pollution compositions all have Absorption Line in visible and infrared band, can be with the various pollutant components of quantitative analysis using these Absorption Lines.TDLAS technologies are using semiconductor laser with tunable as light source, with spectral resolution and tunability very high, shaken using one of these features to gas molecule to be measured in the spectral region and turn the spectral absorption of line and measure, so as to 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 just employs above-mentioned TDLAS technologies, simultaneously, in order to monitor multiple monitoring points, employ optical fiber splitter carries out branch transmission to laser, and the return optical fiber of each monitoring point is corresponded to, and an infrared photoelectric detector is equipped with, each infrared photoelectric detector is used to detect the spectral information that correspondence monitoring point returns.The program to laser due to having carried out branch process, distance of its transmission decreases, and can only realize the monitoring of short-range distributed point, and each input interface when main frame is returned in optical fiber splitter will set an infrared photoelectric detector, relatively costly, control uses also complex.
The content of the invention
It is an object of the invention to provide a kind of online gas monitoring system of optical fiber distributed type multiple spot, to solve the problems, such as that existing monitoring system monitoring distance is short and control is complicated, while providing a kind of online gas monitoring system main frame of optical fiber distributed type multiple spot.
In order to realize the above object the technical scheme that the online gas monitoring system of optical fiber distributed type multiple spot of the present invention is used is：A kind of online gas monitoring system of optical fiber distributed type multiple spot, popped one's head in including main frame and the monitoring for being distributed in each monitoring point, laser is installed in the main frame, the output end of the laser is connected to the input of 1*N input optical switches, the N roads output end of 1*N input optical switches is connected to each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the N roads correspondence input that the 1*N set in main frame exports photoswitch by output optical fibre, and the output end of 1*N output photoswitches is connected with infrared photoelectric detector；The control module for controlling 1*N to export photoswitch and 1*N input optical switches strobe sets monitoring probe respective optical path is additionally provided with the main frame, the N roads timesharing that control module uses the scan period of setting time to be scanned the N channel of 1*N input optical switches to realize laser in the monitoring system is detected.
The control module by Transmission Fibers and it is each monitoring probe in set be locally displayed and alarm unit communication connection.
Being locally displayed for being set in the Transmission Fibers and control module and monitoring probe is equipped with corresponding fiber optical transceiver and alarm unit between.
Main display module and the communication interface for being communicated to connect with mining substation are additionally provided with the main frame.
The control module uses fpga chip.
The technical scheme that the online gas monitoring system main frame of optical fiber distributed type multiple spot of the present invention is used is：A kind of online gas monitoring system main frame of optical fiber distributed type multiple spot, including the interior laser for setting, the output end of the laser is connected to the input of 1*N input optical switches, the N roads output end of 1*N input optical switches is used to be connected to each corresponding monitoring probe by input optical fibre, the N roads correspondence input of the 1*N output photoswitches set in for being connected to main frame by output optical fibre from the optical signal of each monitoring probe output, the output end of 1*N output photoswitches is connected with infrared photoelectric detector；The control module for controlling 1*N to export photoswitch and 1*N input optical switches strobe sets monitoring probe respective optical path is additionally provided with the main frame, the N roads timesharing that control module uses the scan period of setting time to be scanned the N channel of 1*N input optical switches to realize laser in the monitoring system is detected.
Main display module and the communication interface for being communicated to connect with mining substation are additionally provided with the main frame.
The control module uses fpga chip.
Main frame of the invention is different according to monitoring point quantity, one or more laser to each sampling air chamber is sent using 1*N input optical switch timesharing, and the laser returned from each sampling air chamber is received using 1*N output photoswitches, the time-sharing multiplex of laser is realized using photoswitch, under conditions of Same Efficieney laser, Fibre Optical Sensor can be distributed farther；In addition, only need to set single infrared photoelectric sensor after 1*N output photoswitches, reduce cost, and it is easy to extension for the absorption of other gases, particularly LONG WAVE INFRARED absorbs, because simple detector can be using the detector for needing refrigeration, if multi-detector, then due to cost and complexity, then it is difficult with.The monitoring system can be underground coal mine, mine, plant working area monitoring multiple spot gas parameter, and cost is relatively low, stable and reliable for performance, and mentality of designing is novel, reasonable, is easy to in-site installation, easy to use.
Brief description of the drawings
Fig. 1 is the topological diagram of the online gas monitoring system of optical fiber distributed type multiple spot of the present invention；
Fig. 2 is structural representation of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further to the present invention.
It is as shown in Figure 1 the topological diagram of the online gas monitoring system of optical fiber distributed type multiple spot of the present invention, the system includes that main frame and the monitoring for being distributed in each monitoring point are popped one's head in, the main frame is arranged on closer to the distance apart from each monitoring point, and the convenient position installed, safeguard, and monitor and corresponding gas sampling assembly is provided with probe (gas sampling assembly of the present embodiment is sampling air chamber), and distributing installation is needing the place of monitoring, tested gas can free in and out sampling air chamber；Connected with optical fiber between each sampling air chamber and main frame.
It is illustrated in figure 2 the online gas monitoring system example structure schematic diagram of optical fiber distributed type multiple spot, as seen from the figure, semiconductor laser and control module are installed in main frame, semiconductor laser as under test gas detection LASER Light Source, using laser control circuit by laser output center wavelength be tuned under test gas Absorption Line center, the temperature operating point of laser is operationally selected first, laser tube core temperature control on the operating point, then constant current is applied to laser, laser can launch the constant laser modulated of a branch of light intensity.
The output end of semiconductor laser is connected to the input of 1*N input optical switches, the N roads output end of 1*N input optical switches is connected to the sampling air chamber set in each corresponding monitoring probe by input optical fibre, each monitoring probe is connected to the N roads correspondence input that the 1*N set in main frame exports photoswitch by output optical fibre, and the output end of 1*N output photoswitches is connected with infrared photoelectric detector；The control module for controlling 1*N to export photoswitch and 1*N input optical switches strobe sets monitoring probe respective optical path is additionally provided with the main frame.
The emergent light of semiconductor laser is transferred to the input of 1*N input optical switches, the N roads output laser exported from each output end of input optical switch is transferred in the sampling air chamber set in corresponding each monitoring probe by input optical fibre, control module is scanned to the N channel of 1*N input optical switches using the scan period of setting time, realizes the N roads timesharing detection of laser in monitoring system.After laser enters corresponding sampling air chamber, optical maser wavelength is inswept under test gas absorption lineshape is into flashlight, the 1*N that the N roads return signal light absorbed through under test gas passed through from sampling air chamber is set in being transmitted back to main frame by output optical fibre exports the corresponding input of photoswitch, 1*N exports photoswitch and 1*N input optical switch channel selecting synchronizations, and the return light signal gating of each detection light path is sequentially exported the output end of photoswitch to 1*N.Received by an infrared photoelectric detector from the flashlight of the output end output of 1*N output photoswitches, it is converted into electric signal and preposition amplification, filtering, and (second harmonic amplitude is linear with the concentration of tested gas by lock-in amplifier to realize second-harmonic detection, gas concentration is higher, the absorbed degree of laser is bigger), demarcated using the under test gas of concentration known, you can realize the measurement under test gas concentration in the air of monitoring point；The first harmonic of infrared photoelectric detector output signal is detected simultaneously, by calculating the ratio of second harmonic and first harmonic, can eliminate the influence of light source intensity fluctuating.
The present invention uses photoswitch, rather than optical fiber splitter, by way of time-sharing multiplex：In synchronization, by controlling two photoswitches, certain monitors the light path corresponding to popping one's head in make two photoswitch synchronous selection pass, is tested and analyzed with to the corresponding optical path information of monitoring probe.Which will not weaken luminous intensity, so long transmission distance, under conditions of Same Efficieney laser, Fibre Optical Sensor can be distributed farther；In addition, it is only necessary to single infrared photoelectric sensor is set after 1*N output photoswitches, cost is reduced.
Control module in main frame realizes that, with compact conformation, the advantage of dependable performance, main frame analyzes gas componant parameter in each monitoring point sampling air chamber, and show according to the parameter calibration value of heterogeneity gas before dispatching from the factory using fpga chip.Concentration software for calculation is installed in control module, is processed by the secondary and first harmonic signal of the laser absorption signal exported to lock-in amplifier, obtain each monitoring point under test gas concentration information, shown in main frame by main display module；Simultaneously by concentration information by be transmitted under the fiber optical transceiver that is set in Transmission Fibers and main frame and monitoring probe corresponding monitoring pop one's head in set be locally displayed and alarm unit, this is locally displayed to include transfiniting with alarm unit and discrimination module and with it controls the audible alarm module that is connected and be locally displayed and light alarm module, realize differentiation and local sound and light alarm that concentration transfinites, meet the work habit of field personnel, there is compatibility in application method with traditional monitoring system.
The optical fiber of the present embodiment has three effects：One is that the narrow-linewidth laser for sending laser is transmitted to distributed sample air chamber from main frame；Two is by the Laser Transmission after the absorption of sampled air chamber to main frame；Three is each distributed point methane concentration information that main frame is measured, in the form of the optical signal under reach each distributed monitoring probe, realize that local concentration transfinites differentiation and sound and light alarm.Cable transmission signal is replaced using optical fiber, is had using the intrinsic safety for improving product, effective reduces cost.
The distributed monitoring probe of the present embodiment is powered using battery, and using low power laser, system host small power consumption, main frame meets system requirements by being powered by low power intrinsic safety electric source module 1.
Main frame has analog signal, data signal output function, the measurement data of each monitoring point can be uploaded into all kinds of monitoring systems in distal end by equipment such as mining monitoring substation, ring exchangers.The main frame of the present embodiment realizes that information is exchanged by one group of communication interface with substation, and main frame is connected with mining monitoring substation using RS485 interfaces, a RJ45 100-M network Ethernet and a 200-1000Hz frequency signal interfaces, realizes that the information between main frame and substation is exchanged.
Present invention also offers a kind of online gas monitoring system main frame of optical fiber distributed type multiple spot, its structure is as described above.
In addition, the laser current of noise spectra of semiconductor lasers carries out high frequency modulated, lock-in amplifier can be coordinated to realize Detection of Weak Signals.After laser enters sampling air chamber, semiconductor laser is become using optical fiber collimator by collimated light beam, suitable number of times of being turned back in air chamber of sampling reaches suitable light path, is then coupled in output optical fibre, passes main frame back.
Claims (8)
1. a kind of online gas monitoring system of optical fiber distributed type multiple spot, including main frame and each monitoring point is distributed in
Monitoring probe, laser is provided with the main frame, it is characterised in that：The output end of the laser is connected to
The input of 1*N input optical switches, the N roads output end of 1*N input optical switches is connected to respectively by input optical fibre
Corresponding monitoring probe, each monitoring probe is connected to the 1*N set in main frame and exports photoswitch by output optical fibre
N roads correspondence input, 1*N output photoswitch output end be connected with infrared photoelectric detector；In the main frame
It is additionally provided with for controlling 1*N to export photoswitch and 1*N input optical switches strobe sets monitoring probe respective optical path
Control module, control module carried out to the N channel of 1*N input optical switches using the scan period of setting time
Scan the N roads timesharing to realize laser in the monitoring system and detect that system of the invention sets single only in main frame
One infrared photoelectric sensor, 1*N roads input optical switch is arranged in main frame；Supervised when laser enters correspondence
After the sampling air chamber of probing head, optical maser wavelength is inswept under test gas absorption lineshape is worn into flashlight from sampling air chamber
The N roads return signal light absorbed through under test gas crossed is transmitted back to what is set in main frame by output optical fibre
The corresponding input of 1*N input optical switches, 1*N input optical switches and the output light switching channels selection of 1*N roads
It is synchronous, sequentially by the output end of the return light signal gating of each detection light path to 1*N input optical switches；Using
1*N input optical switches and 1*N roads output photoswitch, by way of time-sharing multiplex：In synchronization, lead to
Control 1*N input optical switches and 1*N roads output photoswitch are crossed, makes 1*N input optical switches and 1*N roads defeated
Go out the light path corresponding to photoswitch synchronous selection pass correspondence monitoring probe, with corresponding optical path information of being popped one's head in the monitoring
Tested and analyzed.
2. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 1, it is characterised in that：
The control module by Transmission Fibers and it is each monitoring probe in set be locally displayed and alarm unit communication connection.
3. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 2, it is characterised in that：
It is right that being locally displayed of being set in the Transmission Fibers and control module and monitoring probe is equipped with and alarm unit between
The fiber optical transceiver answered.
4. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 3, it is characterised in that：
Main display module and the communication interface for being communicated to connect with mining substation are additionally provided with the main frame.
5. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 3 or 4, its feature
It is：The control module uses fpga chip.
6. a kind of online gas monitoring system main frame of optical fiber distributed type multiple spot, including the interior laser for setting, it is special
Levy and be：The output end of the laser is connected to the input of 1*N input optical switches, 1*N input optical switches
N roads output end be used for by input optical fibre be connected to it is each it is corresponding monitoring probe, for from it is each monitoring probe it is defeated
The optical signal for going out is connected to the N roads correspondence input that the 1*N set in main frame exports photoswitch by output optical fibre,
The output end of 1*N output photoswitches is connected with infrared photoelectric detector；It is additionally provided with for controlling 1*N in the main frame
The control module of output photoswitch and 1*N input optical switches strobe sets monitoring probe respective optical path, control module
N channel to 1*N input optical switches uses the scan period of setting time to be scanned to realize the monitoring system
The N roads timesharing detection of middle laser, 1*N roads input optical switch is arranged in main frame；When laser enters correspondence
After monitoring the sampling air chamber of probe, optical maser wavelength is inswept under test gas absorption lineshape into flashlight, from sampling air chamber
The N roads return signal light absorbed through under test gas for passing through is transmitted back to what is set in main frame by output optical fibre
The corresponding input of 1*N input optical switches, 1*N input optical switches and the output light switching channels selection of 1*N roads
It is synchronous, sequentially by the output end of the return light signal gating of each detection light path to 1*N input optical switches；Using
1*N input optical switches and 1*N roads output photoswitch, by way of time-sharing multiplex：In synchronization, lead to
Control 1*N input optical switches and 1*N roads output photoswitch are crossed, makes 1*N input optical switches and 1*N roads defeated
Go out the light path corresponding to photoswitch synchronous selection pass correspondence monitoring probe, with corresponding optical path information of being popped one's head in the monitoring
Tested and analyzed.
7. the online gas monitoring system main frame of optical fiber distributed type multiple spot according to claim 6, its feature
It is：Main display module and the communication interface for being communicated to connect with mining substation are additionally provided with the main frame.
8. the online gas monitoring system main frame of optical fiber distributed type multiple spot according to claim 6 or 7, its
It is characterised by：The control module uses fpga chip.
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| CN105510276A (en) * | 2015-12-01 | 2016-04-20 | 武汉阿卡瑞思光电自控有限公司 | TDLAS-based multicomponent gas multi-point monitoring system |
| CN108120852B (en) * | 2017-11-24 | 2020-03-20 | 清华大学 | Multi-probe time-sharing multiplexing device, flow velocity measuring device and method |
| CN109188265A (en) * | 2018-10-08 | 2019-01-11 | 南昌航空大学 | For monitoring SF on-line6The devices and methods therefor of circuit breaker failure type |
| CN109215297A (en) * | 2018-11-13 | 2019-01-15 | 珠海任驰光电科技有限公司 | A kind of time-sharing multiplex optical fiber flammable gas alarm device and method |
| CN111189799A (en) * | 2018-11-14 | 2020-05-22 | 汉泰黄石科技有限公司 | Laser gas monitoring system |
| CN109900648A (en) * | 2019-03-20 | 2019-06-18 | 重庆梅安森科技股份有限公司 | Distributed optical fiber sensor applied to underground pipe gallery |
| CN112362597A (en) * | 2020-11-16 | 2021-02-12 | 安徽中科瀚海光电技术发展有限公司 | Multi-path laser gas monitoring system and monitoring method |
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| CN100520360C (en) * | 2006-07-19 | 2009-07-29 | 中国科学院安徽光学精密机械研究所 | Opening natural gas leaking multi-channel monitoring method and light path structure |
| CN1963462A (en) * | 2006-11-10 | 2007-05-16 | 贵州大学 | Laser monitoring system for gas |
| CN101281127A (en) * | 2008-05-06 | 2008-10-08 | 中国科学院安徽光学精密机械研究所 | Instrument and method for real time monitoring optical fibre distributed multi-point mash gas |
| CN202047867U (en) * | 2011-04-01 | 2011-11-23 | 东华大学 | Gas concentration real-time detecting system |
| CN203490168U (en) * | 2013-09-05 | 2014-03-19 | 郑州光力科技股份有限公司 | Fiber-distributed multi-point online gas monitoring system and host thereof |
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