CN203929630U - TDLAS concentration of methane gas detection system - Google Patents
TDLAS concentration of methane gas detection system Download PDFInfo
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- CN203929630U CN203929630U CN201420236915.8U CN201420236915U CN203929630U CN 203929630 U CN203929630 U CN 203929630U CN 201420236915 U CN201420236915 U CN 201420236915U CN 203929630 U CN203929630 U CN 203929630U
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Abstract
The utility model relates to a kind of gas concentration detection system, especially TDLAS concentration of methane gas detection system, it comprises function signal generator (1), Distributed Feedback Laser (2), laser aligner transmitting terminal (3), laser aligner receiving end (4), photodetector (6), filtering and amplifying circuit (7), phase-locked amplifying circuit (8), data acquisition module (9), PC (10) and warning device (11).The utility model creation TDLAS concentration of methane gas detection system is simple in structure, and reliability is high, and cost is lower; Meanwhile, the utility model is created based on TDLAS Gas Thickness Detecting Technology, and testing result precision is high, with a high credibility; In addition, the utility model is created the kinetic measurement that can realize methane gas, highly sensitive, exceedes set threshold value once detect concentration of methane gas, can report to the police immediately, at utmost reduces the possibility that methane gas explosion accident occurs.
Description
Technical field
The utility model relates to a kind of gas concentration detection system, especially a kind of high sensitivity, high precision, TDLAS concentration of methane gas detection system cheaply.
Background technology
In the process of rock gas collection, processing and conveying, the key equipment long service such as pipeline is in high pressure, corrosion environment, easily cause corrosion default, thereby cause Leakage Gas, in recent years, having there are a lot of natural gas leaking accidents in China, has caused huge economic loss.Therefore be badly in need of a set of efficient, high precision, Leakage Gas detection technique and theoretical system cheaply, with guarantee personnel and Environmental security.
The technological means that current domestic methane detects is mainly the point type instrument of chemical method and semiconductor transducer method or electrochemical method.Although the instrument of chemical method can reach testing requirement in sensitivity, but due to " poisoning " the problem of sensor self, need to often demarcate calibration, generally there is the shortcomings such as the intersection that response speed slowly, is easily subject to other gas componant and surface contamination is disturbed, sensor is expensive.
Utility model content
For above-mentioned prior art, problem to be solved in the utility model is to provide a kind of high sensitivity, high precision, concentration of methane gas detection system cheaply.
For addressing the above problem, the technical solution adopted in the utility model is as follows: TDLAS concentration of methane gas detection system, comprise function signal generator, Distributed Feedback Laser, laser aligner transmitting terminal, laser aligner receiving end, photodetector, filtering and amplifying circuit, phase-locked amplifying circuit, data acquisition module, PC and warning device, described function signal generator is connected with described Distributed Feedback Laser by radio frequency connecting line, and described Distributed Feedback Laser is connected with described laser aligner transmitting terminal by optical patchcord; Described laser aligner receiving end is connected with described photodetector, light signal is converted to electric signal by described photodetector, and electric signal is outputed to filtering and amplifying circuit, described filtering and amplifying circuit is connected with described phase-locked amplifying circuit, signal is input to PC through data acquisition module and carries out Digital Signal Analysis and Processing after phase-locked amplifying circuit, and described PC is connected with described warning device.
Adopt such TDLAS concentration of methane gas detection system, it utilizes TDLAS(tunable diode laser absorption spectroscopy technology) detect principle, can carry out dynamic detection in real time to methane gas, there is high sensitivity, high-precision advantage; Meanwhile, this system architecture is simple, and cost is lower.
Preferably, described laser aligner transmitting terminal and described laser aligner receiving end are placed in methane gas environment.
Preferably, described laser aligner transmitting terminal and described laser aligner receiving end are coupled completely.
The beneficial effects of the utility model are: the utility model is created simple in structure, and reliability is high, and cost is lower; Meanwhile, the utility model is created based on TDLAS Gas Thickness Detecting Technology, and testing result precision is high, with a high credibility; In addition, the utility model is created the kinetic measurement that can realize methane gas, highly sensitive, exceedes set threshold value once detect concentration of methane gas, can report to the police immediately, at utmost reduces methane gas and leaks the possibility that causes explosion accident to occur.
Brief description of the drawings
Fig. 1 is the system construction drawing of the utility model TDLAS concentration of methane gas detection system.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, the utility model is created TDLAS concentration of methane gas detection system, comprise function signal generator 1, Distributed Feedback Laser 2, laser aligner transmitting terminal 3, laser aligner receiving end 4, photodetector 6, filtering and amplifying circuit 7, phase-locked amplifying circuit 8, data acquisition module 9, PC 10 and warning device 11, function signal generator 1 is connected with Distributed Feedback Laser 2 by radio frequency connecting line, Distributed Feedback Laser 2 is connected with laser aligner transmitting terminal 3 by optical patchcord, laser aligner transmitting terminal 3 is coupled completely with laser aligner receiving end 4, and be all placed in methane gas environment, laser aligner receiving end 4 is connected with photodetector 6, light signal is converted to electric signal by photodetector 6, and electric signal is outputed to filtering and amplifying circuit 7, filtering and amplifying circuit 7 is connected with phase-locked amplifying circuit 8, signal is input to PC 10 through data acquisition module 9 and carries out Digital Signal Analysis and Processing after phase-locked amplifying circuit 8, and PC 10 is connected with warning device 11.
While utilizing this concentration of methane gas detection system to carry out concentration of methane gas detection, launch the long laser beam of standing wave by Distributed Feedback Laser 2, after the modulation signal modulation that laser beam is sent through function signal generator 1, enter laser aligner transmitting terminal 3.The laser being sent by laser aligner transmitting terminal 3 enters photodetector 6 through laser aligner receiving end 4 after by methane gas environment 5.Light signal is converted to electric signal by photodetector 6, and enter data acquisition module 9 after filtering and amplifying circuit 7,8 rough handlings of phase-locked amplifying circuit.The signal collecting is transferred to PC 10 by data acquisition module 9, carries out advanced treating by PC 10.When PC 10 results show that the concentration of methane gas of surveying are while exceeding set secure threshold, PC 10 sends enabled instruction and starts immediately warning device 11 and report to the police, and causes the possibility of explosion accident generation at utmost to reduce methane gas leakage.
With way of example, the utility model is illustrated above, but the utility model is not limited to above-mentioned instantiation, all any changes of doing based on the utility model or modification all belong to the claimed scope of the utility model.
Claims (3)
1.TDLAS concentration of methane gas detection system, it is characterized in that: comprise function signal generator (1), Distributed Feedback Laser (2), laser aligner transmitting terminal (3), laser aligner receiving end (4), photodetector (6), filtering and amplifying circuit (7), phase-locked amplifying circuit (8), data acquisition module (9), PC (10) and warning device (11), described function signal generator (1) is connected with described Distributed Feedback Laser (2) by radio frequency connecting line, described Distributed Feedback Laser (2) is connected with described laser aligner transmitting terminal (3) by optical patchcord, described laser aligner receiving end (4) is connected with described photodetector (6), light signal is converted to electric signal by described photodetector (6), and electric signal is outputed to filtering and amplifying circuit (7), described filtering and amplifying circuit (7) is connected with described phase-locked amplifying circuit (8), signal is input to PC (10) through phase-locked amplifying circuit (8) by data acquisition module (9) and carries out Digital Signal Analysis and Processing, and described PC (10) is connected with described warning device (11).
2. TDLAS concentration of methane gas detection system according to claim 1, is characterized in that: described laser aligner transmitting terminal (3) is placed in methane gas environment with described laser aligner receiving end (4).
3. TDLAS concentration of methane gas detection system according to claim 2, is characterized in that: described laser aligner transmitting terminal (3) is coupled completely with described laser aligner receiving end (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236915.8U CN203929630U (en) | 2014-05-11 | 2014-05-11 | TDLAS concentration of methane gas detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236915.8U CN203929630U (en) | 2014-05-11 | 2014-05-11 | TDLAS concentration of methane gas detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203929630U true CN203929630U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420236915.8U Expired - Fee Related CN203929630U (en) | 2014-05-11 | 2014-05-11 | TDLAS concentration of methane gas detection system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241817A (en) * | 2015-11-01 | 2016-01-13 | 李俊娇 | Optical fiber sensing gas detection device |
| CN105389965A (en) * | 2015-11-09 | 2016-03-09 | 武汉新烽光电股份有限公司 | Urban gas pipeline wireless monitoring system and monitoring method based on TDLAS (tunable diode laser absorption spectroscopy) sensors |
| CN107831136A (en) * | 2017-10-28 | 2018-03-23 | 李岩 | Alkanes mixed gas Laser Detecting Set |
| CN107831139A (en) * | 2017-10-28 | 2018-03-23 | 李岩 | Mixed gas near-infrared laser on-line monitoring system |
| CN108169128A (en) * | 2018-01-10 | 2018-06-15 | 绵阳鑫阳知识产权运营有限公司 | For the equipment of Coal mine methane Concentration Testing |
| CN108709870A (en) * | 2017-12-26 | 2018-10-26 | 重庆光可巡科技有限公司 | A kind of coal mine of high-precision and high-stability CH_4 detection alarm |
| CN110296918A (en) * | 2019-07-04 | 2019-10-01 | 哈尔滨工程大学 | A kind of diesel engine discharged particle concentration on-line measuring device and detection method |
-
2014
- 2014-05-11 CN CN201420236915.8U patent/CN203929630U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241817A (en) * | 2015-11-01 | 2016-01-13 | 李俊娇 | Optical fiber sensing gas detection device |
| CN105389965A (en) * | 2015-11-09 | 2016-03-09 | 武汉新烽光电股份有限公司 | Urban gas pipeline wireless monitoring system and monitoring method based on TDLAS (tunable diode laser absorption spectroscopy) sensors |
| CN107831136A (en) * | 2017-10-28 | 2018-03-23 | 李岩 | Alkanes mixed gas Laser Detecting Set |
| CN107831139A (en) * | 2017-10-28 | 2018-03-23 | 李岩 | Mixed gas near-infrared laser on-line monitoring system |
| CN107831139B (en) * | 2017-10-28 | 2020-04-21 | 北京航星网讯技术股份有限公司 | Mixed gas near-infrared laser on-line monitoring system |
| CN107831136B (en) * | 2017-10-28 | 2020-04-21 | 北京航星网讯技术股份有限公司 | Laser detector for alkane mixed gas |
| CN108709870A (en) * | 2017-12-26 | 2018-10-26 | 重庆光可巡科技有限公司 | A kind of coal mine of high-precision and high-stability CH_4 detection alarm |
| CN108169128A (en) * | 2018-01-10 | 2018-06-15 | 绵阳鑫阳知识产权运营有限公司 | For the equipment of Coal mine methane Concentration Testing |
| CN110296918A (en) * | 2019-07-04 | 2019-10-01 | 哈尔滨工程大学 | A kind of diesel engine discharged particle concentration on-line measuring device and detection method |
| CN110296918B (en) * | 2019-07-04 | 2021-10-12 | 哈尔滨工程大学 | Diesel engine emission particulate matter concentration online detection device and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150511 |
|
| EXPY | Termination of patent right or utility model |