CN1963462A - Laser monitoring system for gas - Google Patents
Laser monitoring system for gas Download PDFInfo
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- CN1963462A CN1963462A CN 200610051272 CN200610051272A CN1963462A CN 1963462 A CN1963462 A CN 1963462A CN 200610051272 CN200610051272 CN 200610051272 CN 200610051272 A CN200610051272 A CN 200610051272A CN 1963462 A CN1963462 A CN 1963462A
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Abstract
This invention discloses one laser gas monitor system, which adopts laser to monitor gas concentration and CAN bus agreement to transmit laser and data, wherein the system comprises laser ejector, light switch, gas probe, light coupler, photoelectricity detector, monitor computer, light and electricity converter and fiber and circuit; the monitor computer is connected to the light switch and photoelectricity probe; the system above part is fixed with monitor computer, photoelectricity and laser; the down part is distributed with several gas probes and monitor points with microprocessor, light coupler, light switch and photoelectricity detector.
Description
Technical field
The present invention relates to utilize the system of optical instrument test, also relate to the mine telltale, furthermore, belong to the system that adopts laser that coal-mine gas is monitored.
Background technology
Gas is the gas that produces in the colliery, and its principal ingredient is a methane.The gas of concentration in explosion limits is met naked light and is promptly blasted, and miner's life is threatened greatly.Therefore the monitoring to gas is the important process of mine.Detection of the gas of widespread use and control system are to adopt the detection of the traditional electrochemical means property advanced gas density at present, and there is following shortcoming in the traditional electrical chemical mode: 1. need regularly sensor to be proofreaied and correct, and proofread and correct loaded down with trivial details; 2. detection speed is low: about 30 seconds; 3. accuracy of detection is low, can only detect 20 * 10
6About; 4. detect only 1km of distance; 5. serviceable life is low; 6. poor anti jamming capability.
Optical gas sensor is a kind of novel sensor that the back occurs, and it mainly refers to utilize medium light absorption to be made light produce decay and produces the fiber gas sensor that characteristic such as interference fringe is made owing to the interference of light of different light paths.Optical fiber is used for gas sensing the incomparable advantage of other sensor: 1. be convenient to multiplexingly, be convenient to into net; 2. anti-electromagnetic interference (EMI), electrical isolation, corrosion-resistant are suitable for measuring flammable explosion hazard gases or work in inflammable and strong electromagnetic interference environment measurement down; 3. sensing unit is simple in structure, and is reliable and stable; 4. in light weight, volume is little, shape variable; 5. highly sensitive.
The light absorption gas sensor is except the advantage that possesses above-mentioned optical gas sensor and have, it is simple also to have light path, can accurately measure and can be simultaneously composition, the concentration of other gas such as be detected at characteristics methane gas concentration, composition, thereby remedy the shortcoming that optical interferometry can not carry out Measurement and analysis to the concrete composition of gas.200610044428.1 number patented claim discloses a kind of " gas differential absorbing monitoring system with fibre-optical and multi-point in mine ".Present stage light absorption methane gas detection method is to utilize the spectral absorption of methane gas to come detected gas concentration, because the absorption line of gas with various takes on a different character, so they can also distinguish different gas and the volume ratio of this gas in mixed gas to a certain extent from mixed gas.But also existing light path complexity, flashing reaches photoelectric device zero point drift surely and influences defectives such as measuring accuracy.
Summary of the invention
The present invention is directed to the above-mentioned shortcoming of traditional product, mainly solve the problem such as correction, detection speed, precision, distance, serviceable life of sensor, a kind of laser monitoring system for gas is provided.
Laser monitoring system for gas of the present invention adopts laser that gas density is monitored, and adopts the CAN bus protocol to carry out the transmission of laser and data by optical fiber; This system comprises the optical fiber and the circuit of generating laser, photoswitch, gas probe, photo-coupler, photodetector, supervisory control comuter (being the CPU processor), photoelectric commutator and connection, and laser instrument, photoswitch, gas probe, photo coupler are connected with optical fiber successively with photodetector; Supervisory control comuter then is connected to photoswitch and photodetector; Whole laser monitoring system for gas is divided into aboveground and down-hole two parts, and aboveground part is equipped with supervisory control comuter, PIN photodetector and laser instrument; Gas probe and monitoring point that the down-hole part then distributes some, each monitoring point is equipped with microprocessor, photo coupler, photoswitch and photodetector again; Whole process adopts the CAN bus protocol to carry out the transmission of laser and data by optical fiber.
The principle of work of laser monitoring system for gas of the present invention is: deliver to each road gas probe by the laser that laser generator produces through photoswitch, the detected light signal of popping one's head in is sent electric signal through photo-coupler and opto-electronic conversion, electric signal is enlarged into standard signal gives A/D conversion, obtain digital signal, and send CPU to handle; CPU sends control signal to photoswitch simultaneously, realizes the control to laser detection system; When gas density reached setting value, system sent alerting signal by the alarm of CAN (a kind of specification of industrial field bus) to the down-hole immediately, and sound and light alarm is promptly carried out in the down-hole.
The inventor points out that the laser of 1650nm wavelength only has the high sensitivity to methane gas, therefore adopt the laser of 1650nm wavelength gas density to be monitored the subtle change that can detect gas, can improve monitoring sensitivity and sensing range by the gas field under the mine.
The inventor also points out, adopts CAN (control local area network, a kind of specification of industrial field bus) bus protocol to carry out the transmission of laser and data by optical fiber, can improve and detect distance and transmission speed; Host computer is used VB (a kind of develop computer software language and environment) and is done the interface, is the usb communication protocol conversion corresponding CAN communication protocol through USBCAN equipment, sends into optic fiber converter then, has realized carrying out two-way communication with LPC2294.Adopt this communication mode, more traditional supervisory system is significantly improved aspect speed, can be up to 1Mbps, and transmission range also increases accordingly simultaneously, and directly transmission range can reach 5km.Adopt Optical Fiber Transmission, improved the safety case in the abominable shaft bottom of environment.
Laser monitoring system for gas provided by the invention has realized that gas detects and the real-time of control owing to introduced embedded real time system, and fiber optic applications in the CAN bus, has been solved the difficult problem of long-distance transmissions, has extremely strong anti-electromagnetic interference performance; As seen this system has the following advantages: to gas detection sensitivity height, response time fast, serviceable life overlength, detection range is long, maintenance cost is extremely low.Be applicable to the monitoring of coal mine gas.
Description of drawings
The following drawings is in order to be illustrated more clearly in laser monitoring system for gas of the present invention:
Fig. 1 is the system works schematic diagram; Fig. 2 carries out the transmission synoptic diagram of laser and data for adopting the CAN bus protocol by optical fiber; Fig. 3 is the structural representation of gas-monitoring instrument; Fig. 4 is the system works synoptic diagram; Fig. 5 is down-hole part monitoring synoptic diagram.
Embodiment
The controller of some methane gas detection probe, 8 single chip microcontroller controls is installed according to the actual needs of gas monitor in certain mine down-hole, this controller comprises photoswitch control and photoelectric detective circuit, the aboveground part of mine is installed generating laser, PIN photodetector and computing machine, gas probe and monitoring point that the down-hole part then distributes some, each monitoring point is equipped with microprocessor, photoswitch, photo coupler, photodetector again; The laser instrument of system, gas probe, photo coupler are connected with optical fiber successively with photodetector, and with optical fiber and circuit the said equipment are coupled together, and its middle controller is connected to computing machine with RS232 (a kind of standard of computer interface) interface; Supervisory control comuter then is connected to photoswitch and photodetector; Whole process adopts the CAN bus protocol to carry out the transmission of laser and data by optical fiber.
Working routine is: launch laser and use Optical Fiber Transmission to the down-hole with the 1650nm long wavelength laser, photoswitch by PC control carries out light path and switches to enter and specify the methane gas check point, send aboveground PIN photodetector by another group photoswitch with laser signal again, send the AD transition card in the computing machine to carry out data acquisition, the gas density that shows the down-hole point on computer interface uses VB exploitation control program to finish methane Concentration Measurement and demonstration in computing machine; Realize reporting to the police and device control by circuit: when gas density reached setting value, system sent alerting signal by the alarm of RS-485 to the down-hole immediately, and sound and light alarm is promptly carried out in the down-hole.
Claims (3)
1 one kinds of laser monitoring system for gas contain probe, monitor, alarm, it is characterized in that this system adopts laser that gas density is monitored, and adopts the CAN bus protocol to carry out the transmission of laser and data by optical fiber; System comprises the optical fiber and the circuit of generating laser, photoswitch, gas probe, photo-coupler, photodetector, supervisory control comuter, photoelectric commutator and connection, and laser instrument, photoswitch, gas probe, photo coupler are connected with optical fiber successively with photodetector; Supervisory control comuter then is connected to photoswitch and photodetector; Total system is divided into aboveground and down-hole two parts, and aboveground part is equipped with supervisory control comuter, PIN photodetector and laser instrument; Gas probe and monitoring point that the down-hole part then distributes some, each monitoring point is equipped with microprocessor, photo coupler, photoswitch and photodetector again.
2 laser monitoring system for gas as claimed in claim 1, the principle of work that it is characterized in that system is: deliver to each road gas probe by the laser that laser generator produces through photoswitch, the detected data of popping one's head in are sent electric signal through photo-coupler and opto-electronic conversion, electric signal is enlarged into standard signal gives A/D conversion, obtain digital signal, and send CPU to handle; CPU sends control signal to photoswitch simultaneously, realizes the control to laser detection system; When gas density reached setting value, system sent alerting signal to the down-hole immediately, and the alarm of down-hole promptly carries out sound and light alarm.
3 laser monitoring system for gas as claimed in claim 1 is characterized in that used laser is the laser of 1650nm wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610051272 CN1963462A (en) | 2006-11-10 | 2006-11-10 | Laser monitoring system for gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610051272 CN1963462A (en) | 2006-11-10 | 2006-11-10 | Laser monitoring system for gas |
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| CN1963462A true CN1963462A (en) | 2007-05-16 |
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| CN 200610051272 Pending CN1963462A (en) | 2006-11-10 | 2006-11-10 | Laser monitoring system for gas |
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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 |
| CN103884666A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Distributed-type laser combustible gas concentration monitoring method and device |
| CN103883353A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Distribution laser gas purely passive warning and monitoring device |
| 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 |
| 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 |
-
2006
- 2006-11-10 CN CN 200610051272 patent/CN1963462A/en active Pending
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 |
| CN103884666A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Distributed-type laser combustible gas concentration monitoring method and device |
| CN103883353A (en) * | 2014-04-16 | 2014-06-25 | 北京航星网讯技术股份有限公司 | Distribution laser gas purely passive warning and monitoring device |
| 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 |
| 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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Open date: 20070516 |