CN103454243B - Optical fiber distribution type multi-point online gas monitoring system and main engine thereof - Google Patents
Optical fiber distribution type multi-point online gas monitoring system and main engine thereof Download PDFInfo
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- CN103454243B CN103454243B CN201310400196.9A CN201310400196A CN103454243B CN 103454243 B CN103454243 B CN 103454243B CN 201310400196 A CN201310400196 A CN 201310400196A CN 103454243 B CN103454243 B CN 103454243B
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Abstract
The invention discloses an optical fiber distribution type multi-point online gas monitoring system and a main engine of the optical fiber distribution type multi-point online gas monitoring system. The optical fiber distribution type multi-point online gas monitoring system comprises the main engine and a monitoring probe distributed on each monitoring point, wherein the main engine is internally provided with a laser device; an output end of the laser device is connected to an input end of an input optical switch; the output end of the input optical switch is connected to each corresponding monitoring probe through an input optical fiber; each monitoring probe is connected to the corresponding input end of an output optical switch arranged in the main engine by an output optical fiber; the output end of the output optical switch is connected with an infrared photoelectric detector; the main engine is internally provided with a control module for controlling the output optical switch and the input optical switch to strobe and set a corresponding light path of each monitoring probe. According to the optical fiber distribution type multi-point online gas monitoring system and the main engine of the optical fiber distribution type multi-point online gas monitoring system, the main engine adopts the optical switches to realize time sharing multiplex of laser; under the condition of the laser devices with the same power, an optical fiber sensor can be distributed further; furthermore, only a single infrared photoelectric sensor needs to be arranged behind the output optical switch, so that the cost is reduced.
Description
Technical field
This utility model is related 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.The conventionally used method adopted afterwards of first taking out is
Take precautions against methane gas accident and improve the plan of the guarantee of Safety of Coal Mine Production operation.In addition, the gas harmful gass come in extraction
Generating production can be carried out, this will bring very big economic interests to colliery.
But, during the extraction of methane gas, need to monitor methane gas concentration on-line in real time.Now
Domestic many mines have been set up the monitoring system of methane concentration, are essentially all the network structure of branch's tree-shaped, in colliery
Main website of control centre is set on well, and underground site arranges multiple observing and controlling substations.Substation gathers information and sends main website to, at main website
Corresponding control command is sent after reason information, is received by substation and is performed.The transmission of information and order, passes through between main website and substation
Private cable is laid, using technologies such as RS485, PSK, FSK, is realized by the private communication protocol of respective regulation.Arrive in substation
Methane information between sensor, by private cable, is transmitted using the analogue signal of 4～20mA or 200～1000Hz, is deposited
Sensor life-time it is short, need frequent adjustment, measurement range is little, accesss is dumb, realize follow-up inconvenience, cannot reflect work surface
The shortcomings of distribution of methane spatial gradient.
The online gas monitoring system of existing many monitoring points arranges monitoring instrument or sensor in each monitoring point, surveys
The gas parameter of amount monitoring point, analytical data simultaneously passes through communication cable by data transfer to system host or server.This
A little monitoring instruments or sensor are generally comprised：Measurement sensing element, signal processing unit, data analysis unit, signal transmitting are passed
Defeated 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 gases process control,
It can provide at a relatively high accuracy of detection, be combined with optical fiber sensing technology, become 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
It 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, roomy, easy using fibre ribbon
In feature into the net, the optical fiber multi-point sensing network system of a multiplexing is constituted, it has also become most hot sensing is ground on our times
Study carefully one of field.The newest fruits of photoelectron technology and Material Field are applied to CH_4 detection research, development a new generation exempts from dimension
Shield, anti-interference, highly sensitive CH_4 detection system, are research trends 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 grid
Change facilitates the maintenance management of system, is 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 to send out on the studies above performance basis
The gas detection technology that exhibition is got up, its principle is as follows：Material has different absorptions, therefore absorption spectra to the electromagnetic wave of different frequency
Line can determine the composition of molecule and dense as " fingerprint " of identification gas with various molecule according to the position of absorption line and intensity
Degree.Because most organic and inorganic pollution compositions all have Absorption Line in visible and infrared band, can be with using these Absorption Lines
The various pollutant components of quantitative analyses.TDLAS technologies using semiconductor laser with tunable as light source, with very high spectrally resolved
Rate and tunability, being shaken using one of these features to gas molecule to be measured in the spectral region is turned the spectral absorption of line and enters
Row measurement, so as to realize the detection of gas concentration.
Chinese Patent Application No. 200810100549.2 disclose a kind of optical fibre distributed multi-point mash gas real-time monitor and
Monitoring method, this monitor just employs above-mentioned TDLAS technologies, meanwhile, in order to monitor multiple monitoring points, employ optical fiber point
Road device carries out branch transmission, and the return optical fiber of each monitoring point of correspondence to laser, is equipped with an infrared photoelectric detector,
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, the distance of its transmission decreases, short-range distributed points monitoring can only be realized, and when main frame is returned in optical fiber point
Each input interface of road device will arrange an infrared photoelectric detector, relatively costly, and control uses also complex.
Utility model content
The purpose of this utility model is to provide a kind of online gas monitoring system of optical fiber distributed type multiple spot, to solve existing prison
The problem that examining system monitoring distance is short and control is complicated, while providing a kind of online gas monitoring system of optical fiber distributed type multiple spot
Main frame.
In order to realize object above, the technology that the online gas monitoring system of this utility model optical fiber distributed type multiple spot is adopted
Scheme is：A kind of online gas monitoring system of optical fiber distributed type multiple spot, including main frame and the monitoring probe of each monitoring point is distributed in,
Laser instrument is installed, the outfan of the laser instrument is connected to the input of 1*N input optical switches, 1*N inputs in the main frame
The N roads outfan of photoswitch is connected to each corresponding monitoring probe by input optical fibre, and each monitoring probe is connected by output optical fibre
It is connected to the N roads correspondence input of the 1*N output photoswitches arranged in main frame, the outfan and infrared electro of 1*N output photoswitches
Detector is connected；It is additionally provided with the main frame and is visited for controlling 1*N output photoswitches and the monitoring of 1*N input optical switches strobe sets
The control module of head respective optical path, control module is carried out to the N channel of 1*N input optical switches using the scan period of setting time
The N roads timesharing detection of laser in scanning to realize the monitoring system.
The control module is communicated to connect by Transmission Fibers and each locally displayed and alarm unit set in probe of monitoring.
Set in the Transmission Fibers and control module and monitoring probe it is locally displayed be equipped with and alarm unit between it is right
The fiber optical transceiver answered.
Main display module and the communication interface for communicating to connect with mining substation are additionally provided with the main frame.
The control module adopts fpga chip.
The technical scheme that the online gas monitoring system main frame of this utility model optical fiber distributed type multiple spot is adopted is：A kind of light
The online gas monitoring system main frame of fine Distributed Multi, including the interior laser instrument for setting, the outfan of the laser instrument is connected to 1*N
The input of input optical switch, the N roads outfan of 1*N input optical switches is used to be connected to each corresponding monitoring by input optical fibre
Probe, for the 1*N arranged in main frame to be connected to by output optical fibre from the optical signal of each monitoring probe output photoswitch is exported
N roads correspondence input, 1*N output photoswitch outfan be connected with infrared photoelectric detector；Use is additionally provided with the main frame
In control 1*N output photoswitches and the control module of 1*N input optical switches strobe sets monitoring probe respective optical path, control module
The N of laser in adopting the scan period of setting time to be scanned to realize the monitoring system N channel of 1*N input optical switches
Road timesharing detection.
Main display module and the communication interface for communicating to connect with mining substation are additionally provided with the main frame.
The control module adopts fpga chip.
Main frame of the present utility model is different according to monitoring point quantity, sends all the way or many using 1*N input optical switch timesharing
Road laser exports the laser that photoswitch reception is returned from each sampling air chamber to each sampling air chamber using 1*N, is opened using light
The time-sharing multiplex of laser is realized in pass, and under conditions of Same Efficieney laser instrument, Fibre Optical Sensor can be distributed farther；In addition,
Only need to arrange single infrared photoelectric sensor after 1*N output photoswitches, reduce cost, and be easy to extension for it
The absorption of its gas, particularly LONG WAVE INFRARED absorb, because simple detector can adopt the detector for needing refrigeration, if visit more
Device is surveyed, then due to cost and complexity, then be it is difficult with.The monitoring system can be underground coal mine, mine, plant working place
Monitoring multiple spot gas parameter, cost is relatively low, stable and reliable for performance, and mentality of designing is novel, reasonable, is easy to in-site installation, user
Just.
Description of the drawings
Fig. 1 is the topological diagram of the online gas monitoring system of this utility model optical fiber distributed type multiple spot；
Fig. 2 is structural representation of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further to this utility model.
The topological diagram of the online gas monitoring system of this utility model optical fiber distributed type multiple spot is illustrated in figure 1, the system bag
Include main frame and the monitoring for being distributed in each monitoring point is popped one's head in, the main frame is arranged on closer to the distance apart from each monitoring point and convenient
The position installed, safeguard, and (gas sampling assembly of the present embodiment is to adopt to be provided with corresponding gas sampling assembly in monitoring probe
Sample air chamber), and distributing installation, in the place for needing monitoring, tested gas can free in and out sampling air chamber；Each sampling air chamber and master
Connected with optical fiber between machine.
The online gas monitoring system example structure schematic diagram of optical fiber distributed type multiple spot is illustrated in figure 2, it is as seen from the figure, main
Semiconductor laser and control module are installed, semiconductor laser is utilized as the detection LASER Light Source of under test gas in machine
Laser control circuit by laser instrument output center wavelength be tuned under test gas Absorption Line center, operationally first select swash
The temperature operating point of light device, laser tube core temperature control on the operating point, then applies constant current, laser to laser
Device can launch the constant laser modulated of a branch of light intensity.
The outfan of semiconductor laser is connected to the input of 1*N input optical switches, and the N roads of 1*N input optical switches are defeated
Go out end and the sampling air chamber set in each corresponding monitoring probe is connected to by input optical fibre, each monitoring probe is connected by output optical fibre
It is connected to the N roads correspondence input of the 1*N output photoswitches arranged in main frame, the outfan and infrared electro of 1*N output photoswitches
Detector is connected；It is additionally provided with the main frame and is visited for controlling 1*N output photoswitches and the monitoring of 1*N input optical switches strobe sets
The control module of head respective optical path.
The emergent light of semiconductor laser is transferred to the input of 1*N input optical switches, from each output of input optical switch
The N roads output laser of end output is transferred in the sampling air chamber set in corresponding each monitoring probe by input optical fibre, controls mould
Block is scanned to the N channel of 1*N input optical switches using the scan period of setting time, realizes the N of laser in monitoring system
Road timesharing detection.After laser enters corresponding sampling air chamber, optical maser wavelength is inswept under test gas absorption lineshape into flashlight, from
The 1* that the N roads return signal light that the Jing under test gas that sampling air chamber is passed through absorbed is transmitted back to be arranged in main frame by output optical fibre
N exports the corresponding input of photoswitch, 1*N output photoswitches and 1*N input optical switch channel selecting synchronizations, sequentially by each detection
The return light signal gating of light path exports the outfan of photoswitch to 1*N.The signal of the outfan output of photoswitch is exported from 1*N
Light is received by an infrared photoelectric detector, is converted into the signal of telecommunication and preposition amplification, filtering, and is realized by lock-in amplifier secondary humorous
(second harmonic amplitude is linear with the concentration of tested gas, and gas concentration is higher, and the absorbed degree of laser is got over for ripple detection
Greatly), 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 the ratio for calculating second harmonic and first harmonic, can
To eliminate the impact that light source intensity rises and falls.
This utility model adopts photoswitch, rather than optical fiber splitter, by way of time-sharing multiplex：In synchronization,
By controlling two photoswitches, certain monitors the corresponding light path of probe to make two photoswitch synchronous selection pass, with to monitoring probe
Corresponding optical path information is tested and analyzed.Which will not weaken light intensity, so long transmission distance, in Same Efficieney laser
Under conditions of device, Fibre Optical Sensor can be distributed farther；In addition, it is only necessary to arrange single after 1*N output photoswitches
Infrared photoelectric sensor, reduces cost.
Control module in main frame is realized using fpga chip, with compact conformation, the advantage of dependable performance, main frame according to
The parameter calibration value of heterogeneity gas before dispatching from the factory, analyzes gas componant parameter in each monitoring point sampling air chamber, and shows.
Concentration software for calculation is installed, by the secondary and once humorous of the laser absorption signal that exports to lock-in amplifier in control module
Ripple signal is processed, and obtains each monitoring point under test gas concentration information, is shown in main frame by main display module；Simultaneously will be dense
Degree information passes through to pass to what is set in corresponding monitoring probe under the fiber optical transceiver set in Transmission Fibers and main frame and monitoring probe
Locally displayed and alarm unit, the locally displayed and alarm unit includes transfiniting discrimination module and controls the sound report that is connected with it
Alert module and locally displayed and light alarm module, realize differentiation and local sound and light alarm that concentration transfinites, meet work on the spot people
The work habit of member, has compatibility with traditional monitoring system in using method.
The optical fiber of the present embodiment has three effects：One is that the narrow-linewidth laser for sending in laser instrument is transmitted to distribution from main frame
Formula sampling air chamber；Two is to main frame by the Laser Transmission after the absorption of sampled air chamber；Three is each distributed points that main frame is measured
Methane concentration information, in the form of the optical signal under reach each distributed monitoring probe, realize that local concentration transfinites differentiation and acousto-optic
Report to the police.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, using low power laser instrument, system host power consumption
Little, main frame meets system requirements by being powered by low power intrinsic safety electric source module 1.
Main frame has analogue signal, digital signal output function, the measurement data of each monitoring point can be passed through into mining prison
Survey the equipment such as substation, ring exchanger and be uploaded to all kinds of monitoring systems in distal end.The main frame of the present embodiment passes through one group of communication interface
Realize that information is exchanged with substation, main frame adopts RS485 interfaces, a RJ45 100-M network Ethernet and a 200- with mining monitoring substation
1000Hz frequency signal interfaces are connected, and realize that the information between main frame and substation is exchanged.
This utility model additionally provides a kind of online gas monitoring system main frame of optical fiber distributed type multiple spot, its structure as above institute
State.
In addition, the laser current of noise spectra of semiconductor lasers carries out high frequency modulated, lock-in amplifier can be coordinated to realize faint
Signal detection.After laser enters sampling air chamber, collimated beam is become semiconductor laser using optical fiber collimator, in sampling gas
Turn back in room suitable number of times, reach suitable light path, be then coupled in output optical fibre, pass main frame back.
Claims (8)
1. a kind of online gas monitoring system of optical fiber distributed type multiple spot, including main frame and be distributed in each monitoring point monitoring probe,
Laser instrument is installed in the main frame, it is characterised in that：The outfan of the laser instrument is connected to the input of 1*N input optical switches
End, the N roads outfan of 1*N input optical switches is connected to each corresponding monitoring probe by input optical fibre, and each monitoring probe passes through
Output optical fibre is connected to the N roads correspondence input of the 1*N output photoswitches arranged in main frame, and 1*N exports the outfan of photoswitch
It is connected with infrared photoelectric detector；It is additionally provided with the main frame for controlling 1*N output photoswitches and 1*N input optical switches gating
The control module of setting monitoring probe respective optical path, N channel sweeping using setting time of the control module to 1*N input optical switches
The cycle of retouching be scanned to realize the monitoring system in laser N roads timesharing detection, the system of the present invention arranges only in main frame
Single infrared photoelectric sensor, 1*N roads input optical switch is arranged in main frame；When laser enters correspondence monitoring probe
After sampling air chamber, optical maser wavelength is inswept under test gas absorption lineshape is inhaled into flashlight, the Jing under test gas passed through from sampling air chamber
The corresponding input of the 1*N input optical switches that the N roads return signal light received is transmitted back to be arranged in main frame by output optical fibre, 1*
N input optical switches and 1*N roads output light switching channels select synchronous, sequentially by the return light signal gating of each detection light path to 1*
The outfan of N input optical switches；Using 1*N input optical switches and 1*N roads output photoswitch, by way of time-sharing multiplex：
Synchronization, by controlling 1*N input optical switches and 1*N roads photoswitch is exported, and makes 1*N input optical switches and 1*N roads output light
The corresponding light path of switch synchronous selection pass correspondence monitoring probe, to pop one's head in the monitoring, corresponding optical path information carries out detection point
Analysis.
2. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 1, it is characterised in that：The control mould
Block is communicated to connect by Transmission Fibers and each locally displayed and alarm unit set in probe of monitoring.
3. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 2, it is characterised in that：The transmission light
It is fine with set in control module and monitoring probe locally displayed corresponding fiber optical transceiver is equipped with and alarm unit between.
4. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 3, it is characterised in that：In the main frame
It is additionally provided with main display module and the communication interface for communicating to connect with mining substation.
5. the online gas monitoring system of optical fiber distributed type multiple spot according to claim 3 or 4, it is characterised in that：The control
Molding block adopts fpga chip.
6. a kind of online gas monitoring system main frame of optical fiber distributed type multiple spot, including the interior laser instrument for setting, it is characterised in that：It is described
The outfan of laser instrument is connected to the input of 1*N input optical switches, and the N roads outfan of 1*N input optical switches is used for by defeated
Enter optical fiber and be connected to each corresponding monitoring probe, for being connected to master by output optical fibre from the optical signal of each monitoring probe output
The N roads correspondence input of the 1*N output photoswitches arranged in machine, the outfan and infrared photoelectric detector of 1*N output photoswitches
It is connected；It is additionally provided with the main frame corresponding with 1*N input optical switches strobe sets monitoring probe for controlling 1*N output photoswitches
The control module of light path, control module adopt the scan period of setting time to be scanned the N channel of 1*N input optical switches with
The N roads timesharing detection of laser in the monitoring system is realized, 1*N roads input optical switch is arranged in main frame；When laser is entered
After the sampling air chamber of correspondence monitoring probe, optical maser wavelength is inswept under test gas absorption lineshape is passed through into flashlight from sampling air chamber
The N roads return signal light that absorbed of the Jing under test gas 1*N input optical switches that are transmitted back to be arranged in main frame by output optical fibre
Corresponding input, 1*N input optical switches and 1*N roads output lights switching channels select synchronous, sequentially returning each detection light path
Heliogram is strobed into the outfan of 1*N input optical switches；Using 1*N input optical switches and 1*N roads output photoswitch, by dividing
The mode of Shi Fuyong：In synchronization, photoswitch is exported by controlling 1*N input optical switches and 1*N roads, open 1*N input lights
The corresponding light path of Guan He 1*N roads output photoswitch synchronous selection pass correspondence monitoring probe, with corresponding light path of popping one's head in the monitoring
Information is tested and analyzed.
7. the online gas monitoring system main frame of optical fiber distributed type multiple spot according to claim 6, it is characterised in that：The master
Main display module and the communication interface for communicating to connect with mining substation are additionally provided with machine.
8. the online gas monitoring system main frame of optical fiber distributed type multiple spot according to claim 6 or 7, it is characterised in that：Institute
State control module and adopt fpga chip.
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| CN201310400196.9A CN103454243B9 (en) | 2013-09-05 | 2013-09-05 | A kind of online gas monitoring system of optical fiber distributed type multiple spot and its main frame |
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| CN103454243A CN103454243A (en) | 2013-12-18 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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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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Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: Power Polytron Technologies Inc Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: Zhengzhou GL Tech Company |
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