CN102954949A - System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration - Google Patents
System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration Download PDFInfo
- Publication number
- CN102954949A CN102954949A CN2012104177961A CN201210417796A CN102954949A CN 102954949 A CN102954949 A CN 102954949A CN 2012104177961 A CN2012104177961 A CN 2012104177961A CN 201210417796 A CN201210417796 A CN 201210417796A CN 102954949 A CN102954949 A CN 102954949A
- Authority
- CN
- China
- Prior art keywords
- output
- mode fiber
- input
- fiber
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a system with multi-channel networkings for simultaneous monitoring on coal mine gas concentration. The system comprises a laser device; a laser device driving circuit drives the laser device to work; the laser emitted by the laser device is connected to an input end of an optical fiber coupler through a single-mode optical fiber; each output end of the optical fiber coupler is connected with an input single-mode fiber; the other end of each single-mode input fiber is connected to an input end of a gas absorption pool; an output end of the gas absorption pool is connected with an output single-mode fiber; light emitted from the input single-mode fiber is coupled into the output single-mode fiber; the other end of each output single-mode fiber is connected to an input end of a photoelectric detector; an output end of each photoelectric detector is commonly connected to a signal processing module, so as to obtain gas concentration in coal mine; and finally the results are uploaded to coal mine safety control department through a communication interface. The invention has advantages of absolute safety, short response time, high sensitivity, dust interference prevention, convenient maintenance, reliable measurement results, conveniently moved and organized monitoring points.
Description
Technical field
The present invention relates generally to the system of monitoring coal mine gas concentration, relates in particular to the system that coal mine gas concentration is monitored in a kind of multichannel networking simultaneously.
Background technology
Coal plays a part huge in national product as the important energy resources of China.But the Safety of Coal Mine Production coefficient of China is compared with the main producing coal in world country, has very large gap, and the mine safety accidents in China more than 80% is caused by gas explosion.The principal ingredient of gas is methane (below mention gas replace with methane) in the colliery, account for 83-89%, the aerial lower explosive limit of methane is 5.3%, on be limited to 15%, when the content of methane reaches in the explosion limits scope, spontaneous combustion of coal under the colliery, naked light, electric spark, stringing locomotive spark, smoking and friction, clash into and blow out the spark that produces and to light gas, cause mine safety accidents.
At present, China's mining methane sensor almost all adopts the gas sensor of catalytic combustion type.The principle of catalytic type gas surveying instrument is that methane gas on the carrier catalyst element surface smokeless combustion occurs, emit reaction heat, component temperature is risen, the increment of component temperature will cause that component resistance increases, by the measuring resistance increment, just can measure methane gas concentration.This quasi-instrument with the output of its signal be easy to process, highly sensitive, be subjected to humidity and temperature to affect the series of advantages such as little, firm in structure, easy to use, become the key instrument of measuring at present Mine Methane both at home and abroad.But its shortcoming of this quasi-instrument is also very obvious: response speed is slow, finishes one-shot measurement and needs 30 seconds; Be that measurement range is little, be subject to " poisoning " of high concentration methane and sulfide, and the shortcoming such as serviceable life is short, poor work stability is easily drifted about, it is frequent to proofread and correct and sensing range is narrow.Because the little shortcoming of catalytic gas transducer measurement range, have in recent years the normal use that combines with carrier catalysis type instrument of thermal conductance instrument, the method of enlarge measurement range is measured 0～5% scope with catalytic type methane measuring instrument, measures the interior gas of 5～100% scopes with thermal conductance type detector.The principle of thermal conductance type gas surveying instrument is to utilize the thermal conductivity difference of methane and air, obtains the signal relevant with tested concentration of methane gas, to determine the concentration of methane gas.But thermal conductance type gas surveying instrument is not suitable for low concentration gas to be measured, and average life is short, poor work stability is easily drifted about, it is frequent to proofread and correct, impact that be subject to water vapor and oxygen concentration.Etc. shortcoming, seriously restricting the colliery to the effective monitoring of methane concentration.
The tunable semiconductor laser gas analyzer is the gas controlling device of a kind of " in real time ", " online ", is usually used in the fields such as petrochemical industry, iron and steel, cement, environmental protection, industrial on-line monitoring.Laser gas analyzer is a kind of highly sensitive gas analysis means, and its principle is after the laser of specific wavelength passes through gas, because being subjected to the absorption at gas specific absorption peak, to produce the decay of light intensity.The available Beer-Lambert law of the decay of light intensity accurate description:
I(v)=I
0(v)exp[-S(T)φ(v)PXL]
I (v) wherein, I
0(v) be respectively after laser passes through gas, by the light intensity before the gas, v is the frequency of laser, and P, X and L are respectively pressure, concentration and the light paths of gas.The strong S(T of line) be the function of temperature T, the shape of linear function φ (v) expression absorption line.By the Beer-Lambert law as can be known, the decay of light intensity and the concentration of tested gas are directly proportional, thereby can obtain by measuring the decay of laser after by gas the concentration of tested gas.Simultaneously, because the emission peak very narrow (less than 15MHz) of Distributed Feedback Laser can select single gas absorption spectrum line to measure during work, be not subjected to the interference of other gases, have very high measurement sensitivity.
With respect to traditional some touch sensor (such as zirconia etc.), laser gas analyzer can detect the gas concentration to be measured on the light path because " original position " formula of employing is measured, so gas concentration that can more real response measurement scene.Special in the larger environment of some measurement volumes, such as the process gas measurement in the large-sized boiler etc., laser gas analyzer is " accurately " more, the concentration of the course of reaction gas of " in real time " more, and simultaneously maintenance has very large application advantage less.
It is a kind of gas monitor mode that development in recent years is the fastest, have bright prospects most that spectrum absorptive optical fiber gas sensor is used for the coal mine gas concentration monitoring.Because the structure of every kind of gas, energy level difference, every kind of gas has unique absorption spectrum, utilizes optical fiber as the transport vehicle of measuring light, realizes remote methane concentration monitoring in conjunction with spectral technique section.Compare with the Methane monitoring instrument of other types, spectrum absorptive optical fiber gas sensor has following advantage: highly sensitive, it is large to measure dynamic range; Because the loss of Optical Fiber Transmission light intensity is little, can with gas monitor away from the monitoring point, realize remote Real-Time Monitoring; Because all live parts of monitoring equipment all place outside the colliery, only by optical fiber the low light level is transferred to sensing point simultaneously, without electromagnetic interference (EMI), without electric spark, the sensing unit simple and stable structure is reliable in the colliery for realization equipment.
Summary of the invention
The object of the invention is exactly in order to remedy the defective of prior art, to provide a kind of multichannel networking to monitor simultaneously the system of coal mine gas concentration.
The present invention is achieved by the following technical solutions:
The system of coal mine gas concentration is monitored in a kind of multichannel networking simultaneously, it is characterized in that: include the main frame that is arranged on outside the colliery, include drive circuit for laser in the main frame, laser instrument, the work of drive circuit for laser drive laser, the laser of laser instrument emission is through the input end of a single-mode fiber incoming fiber optic coupling mechanism, fiber coupler has a plurality of output terminals, each output terminal is connected to an input single-mode fiber, many input single-mode fibers are introduced in the colliery, the input end of a gas absorption cell of other end access of every input single-mode fiber, the output terminal of gas absorption cell is connected to the output single-mode fiber, described gas absorption cell includes air chamber, the two ends of air chamber are respectively equipped with input lens, output lens, the light of outgoing becomes directional light through input lens collimation and passes air chamber from the input single-mode fiber, output lens by the air chamber other end is coupled in the output single-mode fiber, the output single-mode fiber is drawn outside the colliery, the input end of the other end access photodetector of every output single-mode fiber, signal processing module of the common access of the output terminal of each photodetector, each photodetector is converted to electric signal with the light signal that receives and delivers to signal processing module and average, filtering, obtain the gas density in the colliery after the nonlinear fitting data are processed, the result uploads to mine safety control department by communication interface the most at last.
The system of coal mine gas concentration is monitored in described a kind of multichannel networking simultaneously, it is characterized in that: described fiber coupler adopts 32 road or No. 16 fiber couplers.
The system of coal mine gas concentration is monitored in described a kind of multichannel networking simultaneously, it is characterized in that: described communication interface adopts RS485 or Ethernet interface.
The system of coal mine gas concentration is monitored in described a kind of multichannel networking simultaneously, it is characterized in that: the length of described air chamber is 5-10cm.
Principle of the present invention is:
Consider the environment for use demand of native system: a plurality of sensing points; Each sensing point spacing is very large; The characteristics such as sensing point is removable adopt the structure of fiber optic network to arrange a plurality of sensing points, use fiber coupler to carry out 32 tunnel (16 tunnel) light splitting, realize network-like 32(16) individual sensing point monitors simultaneously.System adopts single-mode fiber as the transmission medium of surveying light and enter mine, and the mine part all be optical fiber, and the electric part of the nothing such as gas absorption cell guarantees absolute anti-explosion safety.System adopts the independent detection method of multichannel, and each road adopts separately a photodetector to measure, and can realize the Real-Time Monitoring of each sensing point, and every light path optical texture is all relatively simple, and optical interference is optimized easily and reduced.
Main frame is as for outside the colliery, laser instrument driver module drive laser normal operation in the main frame, and carry out length scanning at centre wavelength 1653nm place, Emission Lasers is introduced in the colliery by single-mode fiber, and through the gas absorption cell, produce light intensity at its absorption peak place and absorb, require the gas absorption cell stable, can keep for a long time normal operating conditions; Gas absorption cell compact size makes things convenient for the movement of monitoring point, and the length of air chamber is 5-10cm; Require the gas absorption cell little to the loss of surveying light, so that most of light of surveying can both be coupled into reception optical fiber, be fully utilized; The generation optical interference that requires the gas absorption cell to try one's best few.Laser after the detection converges coupled into optical fibres and is transmitted back outside the colliery through lens is accepted to become electric signal by photodetector, electric signal is through data handling procedures such as average, filtering, nonlinear fittings, can obtain the gas density in the colliery, net result can pass through RS485, and the interfaces such as Ethernet upload to mine safety control department.
Advantage of the present invention is:
1, absolute anti-explosion safety.All live parts of instrument all outside the colliery, only have optical fiber that weak laser is introduced the down-hole and survey, and can not produce any electric spark.
2, the response time is short, and is highly sensitive.Distributed Feedback Laser has the characteristic of quick response, and each absorption peak only needs a millisecond magnitude sweep time, and can continuous working, and the accuracy of detection of gas density can reach 10ppm.
3, can overcome dust and disturb.Instrument relies on the acquisition gas concentration that detects the harmonic signal that absorbs but not directly absorb light intensity signal, so instrument has very strong tolerance to light intensity attenuation, only needs light intensity to reach more than 15% of light intensity of normal operation, and instrument just can keep normal operation.
4, easy to maintenance.If the absorption cell eyeglass has been polluted by dust or gas liquid, only need to get final product with the clean direct wiping of soft paper.In addition, instrument has very high stability, year once gets final product from new calibration generalized case half a year to one.
5, measurement result is reliable.The instrument Real-Time Monitoring sees through light intensity, and instrument can both send warning if light path occurs unusual or absorption cell is blocked, and has guaranteed can not obtain because instrument goes wrong wrong monitoring concentration value.
6, convenient mobile, the networking in monitoring point.In conjunction with ripe optical fiber technology, can carry out easily the movement of networking and monitoring point under the ore deposit.
Description of drawings
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the structural representation of gas absorption cell of the present invention.
Embodiment
Such as Fig. 1, shown in 2, the system of coal mine gas concentration is monitored in a kind of multichannel networking simultaneously, include the main frame that is arranged on outside the colliery, include drive circuit for laser 1 in the main frame, laser instrument 2,2 work of drive circuit for laser 1 drive laser, the laser of laser instrument 2 emissions is through the input end of a single-mode fiber 3 accesses No. 32 fiber couplers 4, fiber coupler 4 has a plurality of output terminals, each output terminal is connected to an input single-mode fiber 5, many input single-mode fibers 5 are introduced in the colliery, the input end of a gas absorption cell 6 of other end access of every input single-mode fiber 5, the output terminal of gas absorption cell 6 is connected to output single-mode fiber 7, gas absorption cell 9 includes air chamber 10, the length of air chamber 10 is 8cm, the two ends of air chamber 10 are respectively equipped with input lens 11, output lens 12, the light of outgoing becomes directional light through input lens 11 collimation and passes air chamber 10 from input single-mode fiber 5, output lens 12 by air chamber 10 other ends is coupled in the output single-mode fiber 7, output single-mode fiber 7 is drawn outside the colliery, the input end of the other end access photodetector 8 of every output single-mode fiber 7, signal processing module 9 of the common access of the output terminal of each photodetector 8, each photodetector 8 is converted to electric signal with the light signal that receives and delivers to signal processing module 9 and average, filtering, obtain the gas density in the colliery after the nonlinear fitting data are processed, the result is by adopting RS485 or ethernet communication interface to upload to mine safety control department the most at last.
Claims (4)
1. the system of coal mine gas concentration is monitored in a multichannel networking simultaneously, it is characterized in that: include the main frame that is arranged on outside the colliery, include drive circuit for laser in the main frame, laser instrument, the work of drive circuit for laser drive laser, the laser of laser instrument emission is through the input end of a single-mode fiber incoming fiber optic coupling mechanism, fiber coupler has a plurality of output terminals, each output terminal is connected to an input single-mode fiber, many input single-mode fibers are introduced in the colliery, the input end of a gas absorption cell of other end access of every input single-mode fiber, the output terminal of gas absorption cell is connected to the output single-mode fiber, described gas absorption cell includes air chamber, the two ends of air chamber are respectively equipped with input lens, output lens, the light of outgoing becomes directional light through input lens collimation and passes air chamber from the input single-mode fiber, output lens by the air chamber other end is coupled in the output single-mode fiber, the output single-mode fiber is drawn outside the colliery, the input end of the other end access photodetector of every output single-mode fiber, signal processing module of the common access of the output terminal of each photodetector, each photodetector is converted to electric signal with the light signal that receives and delivers to signal processing module and average, filtering, obtain the gas density in the colliery after the nonlinear fitting data are processed, the result uploads to mine safety control department by communication interface the most at last.
2. the system of coal mine gas concentration is monitored in a kind of multichannel networking according to claim 1 simultaneously, and it is characterized in that: described fiber coupler adopts 32 road or No. 16 fiber couplers.
3. the system of coal mine gas concentration is monitored in a kind of multichannel networking according to claim 1 simultaneously, it is characterized in that: described communication interface adopts RS485 or Ethernet interface.
4. the system of coal mine gas concentration is monitored in a kind of multichannel networking according to claim 1 simultaneously, and it is characterized in that: the length of described air chamber is 5-10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104177961A CN102954949A (en) | 2012-10-25 | 2012-10-25 | System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104177961A CN102954949A (en) | 2012-10-25 | 2012-10-25 | System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102954949A true CN102954949A (en) | 2013-03-06 |
Family
ID=47764041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104177961A Pending CN102954949A (en) | 2012-10-25 | 2012-10-25 | System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102954949A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2532088A (en) * | 2014-11-10 | 2016-05-11 | Optosci Ltd | Multipoint gas sensing apparatus |
| RU2615225C1 (en) * | 2015-12-21 | 2017-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ) | Device for measuring methane concentration in gases mixture |
| CN108375555A (en) * | 2018-02-28 | 2018-08-07 | 山东微感光电子有限公司 | Optical fiber methane sensing module, optical fiber multiple spot photo-electric methane transducer and system |
| CN111456721A (en) * | 2020-04-16 | 2020-07-28 | 西安科技大学 | Device and method for measuring gas pressure of multistage air bag rapid hole sealing |
| RU216148U1 (en) * | 2022-08-29 | 2023-01-18 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | Optoelectronic gas analyzer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945287A (en) * | 2006-10-17 | 2007-04-11 | 中国科学院安徽光学精密机械研究所 | New nodal real time gas concentration monitoring method and sensor |
| 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 |
| CN201367919Y (en) * | 2009-01-09 | 2009-12-23 | 武汉电信器件有限公司 | Multipoint online detecting device for coal mine gas |
-
2012
- 2012-10-25 CN CN2012104177961A patent/CN102954949A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945287A (en) * | 2006-10-17 | 2007-04-11 | 中国科学院安徽光学精密机械研究所 | New nodal real time gas concentration monitoring method and sensor |
| 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 |
| CN201367919Y (en) * | 2009-01-09 | 2009-12-23 | 武汉电信器件有限公司 | Multipoint online detecting device for coal mine gas |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2532088A (en) * | 2014-11-10 | 2016-05-11 | Optosci Ltd | Multipoint gas sensing apparatus |
| GB2532088B (en) * | 2014-11-10 | 2017-10-11 | Optosci Ltd | Multipoint gas sensing apparatus |
| RU2615225C1 (en) * | 2015-12-21 | 2017-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ) | Device for measuring methane concentration in gases mixture |
| CN108375555A (en) * | 2018-02-28 | 2018-08-07 | 山东微感光电子有限公司 | Optical fiber methane sensing module, optical fiber multiple spot photo-electric methane transducer and system |
| CN108375555B (en) * | 2018-02-28 | 2021-12-17 | 山东微感光电子有限公司 | Optical fiber methane sensing module, optical fiber multi-point photoelectric methane sensor and system |
| CN111456721A (en) * | 2020-04-16 | 2020-07-28 | 西安科技大学 | Device and method for measuring gas pressure of multistage air bag rapid hole sealing |
| CN111456721B (en) * | 2020-04-16 | 2023-05-23 | 西安科技大学 | Multistage airbag rapid hole sealing gas pressure measuring device and measuring method |
| RU216148U1 (en) * | 2022-08-29 | 2023-01-18 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | Optoelectronic gas analyzer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102967580B (en) | VCSEL (vertical cavity surface emitting laser)-based low-power-consumption gas detection method and device | |
| CN1900696B (en) | Hollow core photon crystal fiber-optic fiber gas sensor | |
| CN101738382B (en) | Transformer failure gas monitoring system and method | |
| CN101251482B (en) | Firedamp remote optical fiber laser detection instrument for mine | |
| CN103439291B (en) | A kind of distribution type fiber-optic methane monitoring system based on TDLAS | |
| CN100460860C (en) | Portable infrared semiconductor laser absorbing type gas detection method and detection apparatus therefor | |
| CN102230889A (en) | Air concentration measuring system and method based on super-continuum spectrum light source | |
| CN203275291U (en) | Coal mine gas safety monitoring system based on optical fiber sensing technology | |
| CN102654455A (en) | Laser gas analyzer for multicomponent multiplexing measurement | |
| CN100507518C (en) | High-performance optical fiber gas sensor | |
| CN102353633A (en) | Flue gas content laser on-line detection method and system | |
| CN103528993A (en) | Laser gas analyzer | |
| CN102954949A (en) | System with multi-channel networkings for simultaneous monitoring on coal mine gas concentration | |
| CN103592253A (en) | Laser gas analyzer for precise temperature compensation in concentration of gas to be measured | |
| CN203720081U (en) | Gas parameter multipoint sensing and measurement type light path structure for laser absorption spectroscopy | |
| CN103454243A (en) | Optical fiber distribution type multi-point online gas monitoring system and main engine thereof | |
| CN105044033A (en) | Intensity-demodulation optical fiber gas sensing device | |
| CN103076295A (en) | Optical fiber sensor network for multicomponent gases | |
| CN101825562A (en) | Method for detecting coal mine gas concentration based on dual wavelength laser | |
| CN203490168U (en) | Fiber-distributed multi-point online gas monitoring system and host thereof | |
| CN202092947U (en) | Optical axis adjusting mechanism of smoke gas content on-line laser detecting system | |
| CN110702625A (en) | Coal mine spontaneous ignition prevention monitoring system based on optical fiber sensing and laser spectrum analysis | |
| CN201716252U (en) | LED dust detection transmitter | |
| CN102478510A (en) | Spectrum-type sensor for methane detection | |
| CN1963462A (en) | Laser monitoring system for gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130306 |