CN105510276A - TDLAS-based multicomponent gas multi-point monitoring system - Google Patents
TDLAS-based multicomponent gas multi-point monitoring system Download PDFInfo
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- CN105510276A CN105510276A CN201510870323.0A CN201510870323A CN105510276A CN 105510276 A CN105510276 A CN 105510276A CN 201510870323 A CN201510870323 A CN 201510870323A CN 105510276 A CN105510276 A CN 105510276A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
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Abstract
The invention discloses a TDLAS-based multicomponent gas multi-point monitoring system. The system comprises three parts, namely a plurality of field optical gas chambers, a transmission line and an indoor main machine; the indoor main machine generates a plurality of beams of detection lasers; the detection lasers are transmitted to the plurality of field optical gas chambers through the optical fiber transmission line; the field optical gas chambers sucks in gas to be detected, and allows the lasers to penetrate the gas to be detected repeatedly in a reflection manner through reflection devices arranged in the field optical gas chambers; laser signals subjected to repeated reflection are returned to the indoor main machine through the optical fiber transmission line; the indoor main machine performs processing, analysis and recognition on the returned laser signals to obtain type and concentration information of the gas to be detected, and displays the information. Through adoption of the system, multi-point monitoring and monitoring of multiple types of gases can be realized, and the system can be applied to various occasions, and is low in subsequent improvement cost.
Description
Technical field
The present invention relates to safety in production and gas monitoring technical field, particularly relate to a kind of multicomponent gas multiple spot monitoring system based on TDLAS.
Background technology
Along with the fast development of national economy, the monitoring of industry spot safety in production is strengthened day by day, such as coal production, natural gas extraction, circulation and storage, pharmacy etc.May be there is inflammable and explosive property gas or toxic gas in these occasions, can bring huge harm to production safety and environment.Therefore, these occasions are had higher requirement for the monitoring of inflammable and explosive dangerous gas or toxic gas.
Domestic semiconductor, catalytic combustion, the electrochemical method of generally adopting detects inflammable and explosive dangerous gas or toxic gas.Accuracy of detection is low, low-response, sensing range are narrow, and the existence of other gases easily causes interference to produce erroneous judgement to detection.And needing often calibration, maintenance workload is large, uses inconvenience.The existence of these problems makes semiconductor, catalytic combustion, electrochemical method be not enough to meet higher detection requirement.Current, advanced method adopts the inflammable and explosive dangerous gas of TDLAS (TunableDiodeLaserAbsorptionSpectroscopy tunable diode laser absorption spectroscopy) technology for detection engineering site or the concentration of toxic gas.TDLAS technology is the method that change by detecting gas transmitted light intensity or reflective light intensity detects gas concentration.Often kind of gas molecule has oneself absorption spectra feature, and the part that the emission spectrum of light source is overlapping with gas absorption spectrum is just absorbed, and the light intensity after absorption will change, and can be finally inversed by the concentration of gas by the conversion detecting light intensity.Because the method has high accuracy and sensitivity, there is the advantages such as range of dynamic measurement is large, the response time soon, is not subject to the interference of other gas, maintenance is little simultaneously, become an important development direction in current gas detection.
Although current single laser monitoring system based on TDLAS has many good qualities, the gas of a lot of occasion monitoring is different, and inconsistent this type systematic that makes of detection requirement also exists some defects.Such as single laser multiple spot monitoring just cannot meet the requirement of multiple gases monitoring, there is follow-up improving cost high, the problems such as scalability difference.
Summary of the invention
The object of the present invention is to provide a kind ofly have that measurement range is large, the response time soon, is not subject to the interference of other gas, maintenance cost the is low multicomponent gas multiple spot monitoring system based on TDLAS, which overcoming the deficiencies in the prior art, is a kind of reliable, cheap, safe multiple spot monitoring system.
The technical solution adopted in the present invention is:
A kind of multicomponent gas multiple spot monitoring system based on TDLAS is provided, comprises multiple live optical air chamber, transmission line and indoor host computer three part;
This indoor host computer produces multi beam detection laser, and by optical fiber transmission line, detection laser is transferred in multiple live optical air chamber, gas to be measured sucks by the plurality of live optical air chamber, and penetrates gas to be measured by the reflection unit arranged in it by laser multiple reflections; Laser signal after multiple reflections returns to indoor host computer by optical fiber transmission line again, and indoor host computer processes the laser signal returned, analyze and identifies, obtains the kind of gas to be measured and concentration information and is shown.
Of the present invention based in the multicomponent gas multiple spot monitoring system of TDLAS, described indoor host computer comprises main frame touch-screen, MCU processor, digital signal processing module and laser detection module;
This main frame touch-screen is for receiving user's input and showing testing result;
This MCU processor is used for control figure processing module and laser detection module, and gathers testing result, process user input data;
This digital signal processing module comprises modulation circuit, temperature control circuit, preposition conditioning amplifying circuit, analog/digital conversion circuit and lock-in amplify circuit, for generation of modulation waveform, controls laser temperature and process detection data;
This laser detection module comprises laser driver, laser instrument, optical splitter, optical combiner and photodetector, for generation of multi-way detecting laser with receive from each road laser signal that live optical air chamber returns, and converts thereof into electric signal; Have multiple laser instrument in this laser detection module, the kind according to gas to be measured is selected, with the different types of gas to be measured of the laser detection sending different-waveband.
Of the present invention based in the multicomponent gas multiple spot monitoring system of TDLAS, described live optical air chamber comprises screen pack, changeable type asepwirator pump, gas flow dryer and optics air chamber;
This screen pack is arranged on the pumping hole of changeable type asepwirator pump, for the particle in filtering gas; This changeable type asepwirator pump, for sucking optics air chamber by gas on-site;
This gas flow dryer for removing the water vapor in gas, to ensure that the gas to be measured entering live optical air chamber is for dry gas;
Be provided with reflection unit in this optics air chamber, laser enters optics air chamber by optical fiber transmission line, and penetrates the gas to be measured in optics air chamber by reflection unit multiple reflections.Of the present invention based in the multicomponent gas multiple spot monitoring system of TDLAS, described transmission line comprises optical fiber transmission line and delivery of electrical energy circuit two parts of detection laser, separate between the two, is respectively used to transfer laser and electric energy transmitting;
This detection laser is delivered to optical splitter by the optical fiber in transmission line, is delivered to each live optical air chamber after recycling optical splitter obtains multichannel sub-laser, and then optical fiber transmission is from live optical air chamber laser out to optical combiner;
The transmission of electric energy is used for powering to live optical air chamber.
Of the present inventionly be reserved with multiple laser instrument expansion interface based in the multicomponent gas multiple spot monitoring system of TDLAS in this laser detection module, for installing the laser instrument of corresponding wave band during follow-up increase gas-monitoring.
Of the present inventionly also be provided with alarm module based in the multicomponent gas multiple spot monitoring system of TDLAS in this live optical air chamber, for when gas concentration to be measured exceeds preset value, carry out on-the-spot sound and light alarm.
Of the present invention based in the multicomponent gas multiple spot monitoring system of TDLAS, the laser that described laser instrument produces is transmitted downwards by optical fiber, optical splitter is divided into the sub-laser of multichannel, the corresponding live optical air chamber of one road laser, in each optical splitter, only a way laser is opened, and imports corresponding live optical air chamber into by optical fiber.
The beneficial effect that the present invention produces is: have multiple laser instrument in the indoor host computer in the present invention, can produce the detection laser of different-waveband, can select according to the kind of gas to be measured.Set of system can be monitored by multiple spot, and multiple types gas-monitoring, can be applied to multiple occasion, and follow-up improving cost is low, and scalability is strong.In addition, live optical air chamber structure of the present invention is simple, is convenient to maintenance or changes, reducing the cost of whole system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the theory structure block diagram of the embodiment of the present invention based on the multicomponent gas multiple spot monitoring system of TDLAS;
Fig. 2 is that embodiment of the present invention laser produces schematic diagram;
Fig. 3 is the embodiment of the present invention a certain way laser detection schematic diagram;
Fig. 4 is the distribution plan of the gas that the monitoring system of the embodiment of the present invention can detect on whole spectral band.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention is based on the multicomponent gas multiple spot monitoring system of TDLAS, as shown in Figure 1, it can be divided into indoor host computer, transmission line and multiple live optical air chamber three part from function logic, position annexation between three is: it is made up of indoor host computer, transmission line and multiple live optical air chamber three part, this indoor host computer is positioned at pulpit, as the core of whole monitoring system, for generation of multi beam detection laser, receive the laser spread out of from optics air chamber and convert concentration information to, also gather simultaneously, show engineering site concentration data; This transmission line is used for the transmission work of electric energy and detection laser; This live optical air chamber is positioned at engineering site, for constantly, incessantly gas on-site being sucked optics air chamber, and to be penetrated the gas to be measured in optics air chamber by laser multiple reflections by the reflection unit in optics air chamber.
Indoor host computer, it comprises main frame touch-screen, MCU processor, digital signal processing module and laser detection module, and this main frame touch-screen is for receiving user's input and showing testing result; This MCU processor control figure processing module and laser detection module, and gather testing result, process user input data; As shown in Figures 2 and 3, this digital signal processing module comprises modulation circuit, temperature control circuit, preposition conditioning amplifying circuit, analog to digital conversion circuit and lock-in amplifier, for generation of modulation waveform, controls laser temperature and process detection data; As shown in Figure 2, this laser detection module comprises laser driver, laser instrument, optical splitter, optical combiner and photodetector, converts electric signal for generation of multi-way detecting laser and reception to from each road laser that live optical air chamber returns.There is multiple laser instrument in this laser detection module, can select according to the kind of gas to be measured, with the different types of gas to be measured of the laser detection sending different-waveband.And be reserved with multiple laser interface in this laser detection module, for installing the laser instrument of corresponding wave band during follow-up increase gas-monitoring.
This modulation circuit is for generation of the modulation waveform needed for laser driver; This temperature control circuit is for controlling the temperature of laser instrument; Both this modulation circuit and temperature control circuit combine and make laser instrument can send the laser of corresponding wave band; This preposition conditioning amplifying circuit is for nursing one's health and amplifying the electric signal coming from photodetector; This analog/digital conversion circuit is used for converting the electrical signal to digital signal; This lock-in amplifier, for reducing the noise in signal, extracts useful signal.
In one embodiment of the present of invention, transmission line comprises transmission and delivery of electrical energy two parts of detection laser, separate between the two, is respectively used to transfer laser and electric energy transmitting; This detection laser is delivered to optical splitter by the optical fiber in transmission line, is delivered to each live optical air chamber after recycling optical splitter obtains multichannel sub-laser, and then optical fiber transmission is from live optical air chamber laser out to optical combiner; This electric energy is used to power to the changeable type asepwirator pump of live optical air chamber and gas flow dryer.
Live optical air chamber comprises screen pack, changeable type asepwirator pump, gas flow dryer and optics air chamber four part composition; This screen pack is arranged on changeable type air-breathing pumping hole, for the particle in filtering gas; This changeable type asepwirator pump, for sucking optics air chamber by gas on-site; This gas flow dryer for removing the water vapor in gas, to ensure that the gas to be measured entering live optical air chamber is for dry gas; Be gas to be measured inside this optics air chamber, laser enters optics air chamber by optical fiber, is penetrated the gas to be measured in optics air chamber by the reflection unit multiple reflections in optics air chamber.
The specific works flow process of the multicomponent gas multiple spot monitoring system based on TDLAS of the embodiment of the present invention is as follows:
Controllers determines the gas needing to detect, and selects the laser instrument that can send corresponding wavelength.Under the acting in conjunction of the laser driver in the temperature control circuit in digital signal processing module and modulation circuit and laser detection module, laser instrument produces the laser for detecting gas to be measured, is passed this laser toward live optical air chamber by the optical fiber transmission line in transmission line.Meanwhile, the gas on-site of the cleaning of drying is sucked being started changeable type asepwirator pump and gas flow dryer by delivery of electrical energy in optics air chamber by indoor host computer.
Laser is transmitted downwards by optical fiber, utilizes the time-division multiplexing function of optical splitter laser to be divided into the sub-laser of multichannel, the corresponding live optical air chamber of a way laser.But only open a way laser, and import corresponding live optical air chamber into by optical fiber, namely synchronization only has a live optical air chamber to complete detection at every turn.Therefore after only having the first way laser detection to terminate, the second way laser just can be delivered to No. two live optical air chambers by optical fiber, and in a sense cycle, each air chamber is detected once successively like this.
For a certain way laser, this way laser imports optics air chamber into by optical fiber, repeatedly the gas to be measured of sweep gas indoor, according to gas concentration generation linear attenuation to be measured, then receives this way laser by optical combiner.Then the sub-laser after decay is converted to corresponding electric signal by photodetector, again via preposition conditioning amplifying circuit carry out nursing one's health amplify, analog/digital conversion circuit conversion becomes digital signal and lock-in amplifier to reduce noise in signal, concentration data is converted into by MCU processor after extracting useful signal, and concentration data is presented in real time on the main frame touch-screen of indoor host computer, so that pulpit user check, if concentration abnormality, start sound and light alarm equipment and report to the police.
In the present invention, the laser instrument of laser detection module has multiple, when needs detect gas with various, only need select the laser instrument that can send corresponding wavelength according to the kind of gas to be measured.
The present invention can realize multiple spot monitoring, and multiple types gas-monitoring, can be applied to multiple occasion, and follow-up improving cost is low, and scalability is strong.In addition, live optical air chamber structure of the present invention is simple, is convenient to maintenance or changes, reducing the cost of whole system.
The multicomponent gas multiple spot monitoring system based on TDLAS of the embodiment of the present invention, its monitoring range is as shown in the square frame of Fig. 4, and the gas that the present invention can monitor in addition also comprises carbon dioxide.
The present invention can be applicable to the multiple occasions such as coal production, natural gas extraction circulation and storage, pharmacy.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (7)
1. based on a multicomponent gas multiple spot monitoring system of TDLAS, it is characterized in that, comprise multiple live optical air chamber, transmission line and indoor host computer three part;
This indoor host computer produces multi beam detection laser, and by optical fiber transmission line, detection laser is transferred in multiple live optical air chamber, gas to be measured sucks by the plurality of live optical air chamber, and penetrates gas to be measured by the reflection unit arranged in it by laser multiple reflections; Laser signal after multiple reflections returns to indoor host computer by transmission line again, and indoor host computer processes the laser signal returned, analyze and identifies, obtains the kind of gas to be measured and concentration information and is shown.
2. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 1, it is characterized in that, described indoor host computer comprises main frame touch-screen, MCU processor, digital signal processing module and laser detection module;
This main frame touch-screen is for receiving user's input and showing testing result;
This MCU processor is used for control figure processing module and laser detection module, and gathers testing result, process user input data;
This digital signal processing module comprises modulation circuit, temperature control circuit, preposition conditioning amplifying circuit, analog/digital conversion circuit and lock-in amplify circuit, for generation of modulation waveform, controls laser temperature and process detection data;
This laser detection module comprises laser driver, laser instrument, optical splitter, optical combiner and photodetector, for generation of multi-way detecting laser with receive from each road laser signal that live optical air chamber returns, and converts thereof into electric signal; Have multiple laser instrument in this laser detection module, the kind according to gas to be measured is selected, with the different types of gas to be measured of the laser detection sending different-waveband.
3. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 2, it is characterized in that, described live optical air chamber comprises screen pack, changeable type asepwirator pump, gas flow dryer and optics air chamber;
This screen pack is arranged on the pumping hole of changeable type asepwirator pump, for the particle in filtering gas; This changeable type asepwirator pump, for sucking optics air chamber by gas on-site;
This gas flow dryer for removing the water vapor in gas, to ensure that the gas to be measured entering live optical air chamber is for dry gas;
Be provided with reflection unit in this optics air chamber, laser enters optics air chamber by optical fiber transmission line, and penetrates the gas to be measured in optics air chamber by reflection unit multiple reflections.
4. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 2, it is characterized in that, described transmission line comprises optical fiber transmission line and delivery of electrical energy circuit two parts of detection laser, separate between the two, is respectively used to transfer laser and electric energy transmitting;
This detection laser is delivered to optical splitter by the optical fiber in transmission line, is delivered to each live optical air chamber after recycling optical splitter obtains multichannel sub-laser, and then optical fiber transmission is from live optical air chamber laser out to optical combiner;
The transmission of electric energy is used for powering to live optical air chamber.
5. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 3, is characterized in that, be reserved with multiple laser instrument expansion interface in this laser detection module, for installing the laser instrument of corresponding wave band during follow-up increase gas-monitoring.
6. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 1, is characterized in that, be also provided with alarm module in this live optical air chamber, for when gas concentration to be measured exceeds preset value, carry out on-the-spot sound and light alarm.
7. the multicomponent gas multiple spot monitoring system based on TDLAS according to claim 2, it is characterized in that, the laser that described laser instrument produces is transmitted downwards by optical fiber, optical splitter is divided into the sub-laser of multichannel, the corresponding live optical air chamber of one road laser, in each optical splitter, only a way laser is opened, and imports corresponding live optical air chamber into by optical fiber.
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Cited By (11)
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| CN106017725A (en) * | 2016-05-26 | 2016-10-12 | 中国人民解放军装备学院 | Measuring device suitable for two-dimensional reconstruction of combustion flow field gas |
| CN106092963A (en) * | 2016-06-01 | 2016-11-09 | 武汉六九传感科技有限公司 | The laser methane concentration monitoring device of multi-angle fast tunable |
| CN106442404A (en) * | 2016-09-28 | 2017-02-22 | 曲阜师范大学 | Real-time on-line multi-component monitoring optical system for stable gas isotopes |
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| CN106647557A (en) * | 2016-10-21 | 2017-05-10 | 中国矿业大学(北京) | Mine explosion monitoring alarm and control system |
| CN111089848A (en) * | 2019-12-31 | 2020-05-01 | 哈尔滨工业大学 | Three-dimensional laser gas scanner |
| CN111289465A (en) * | 2020-03-24 | 2020-06-16 | 中国科学院长春光学精密机械与物理研究所 | TDLAS gas detection system and driving method thereof |
| 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 |
| CN112461786A (en) * | 2020-09-30 | 2021-03-09 | 北京工业大学 | Aviation oxygen detection method and system based on TDLAS and optical frequency comb |
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| CN106442404A (en) * | 2016-09-28 | 2017-02-22 | 曲阜师范大学 | Real-time on-line multi-component monitoring optical system for stable gas isotopes |
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| CN106525742A (en) * | 2016-12-13 | 2017-03-22 | 山东省科学院激光研究所 | Gas concentration monitoring method, apparatus and system |
| CN111089848A (en) * | 2019-12-31 | 2020-05-01 | 哈尔滨工业大学 | Three-dimensional laser gas scanner |
| CN111289465A (en) * | 2020-03-24 | 2020-06-16 | 中国科学院长春光学精密机械与物理研究所 | TDLAS gas detection system and driving method thereof |
| CN112461786A (en) * | 2020-09-30 | 2021-03-09 | 北京工业大学 | Aviation oxygen detection method and system based on TDLAS and optical frequency comb |
| 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 |
| CN112730254A (en) * | 2020-12-30 | 2021-04-30 | 深圳市利拓光电有限公司 | Multipoint distributed laser methane detection system |
| CN114235655A (en) * | 2021-12-17 | 2022-03-25 | 数量级(上海)信息技术有限公司 | Novel laser PM sensor and method for monitoring PM in field to be measured |
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