CN110031405A - Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar - Google Patents

Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar Download PDF

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Publication number
CN110031405A
CN110031405A CN201910168232.0A CN201910168232A CN110031405A CN 110031405 A CN110031405 A CN 110031405A CN 201910168232 A CN201910168232 A CN 201910168232A CN 110031405 A CN110031405 A CN 110031405A
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CN
China
Prior art keywords
stainless steel
steel tube
optical window
connecting cylinder
seal isolation
Prior art date
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Pending
Application number
CN201910168232.0A
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Chinese (zh)
Inventor
鞠昱
魏占峰
吕佳明
李彦林
王振华
常洋
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Beijing Aerospace Yilian Science and Technology Development Co Ltd
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Beijing Aerospace Yilian Science and Technology Development Co Ltd
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Publication date
Application filed by Beijing Aerospace Yilian Science and Technology Development Co Ltd filed Critical Beijing Aerospace Yilian Science and Technology Development Co Ltd
Priority to CN201910168232.0A priority Critical patent/CN110031405A/en
Publication of CN110031405A publication Critical patent/CN110031405A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01Arrangements or apparatus for facilitating the optical investigation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses non-fibers in a kind of detection bar, light path adjustable laser pipeline gas sensor, including ring flange, stainless steel tube is arranged in ring flange side, stainless steel tube front end is connected with gas chamber connecting cylinder, gas chamber connecting cylinder and stainless steel tube inner hole penetrate through, gas chamber connecting cylinder front end is provided with diffuse reflector, gas chamber connecting cylinder connect end side with stainless steel tube and is provided with the first seal isolation optical window, the connection end side of stainless steel tube and flange is provided with optical fiber collimator, the ring flange other side and stainless steel tube perforation are provided with reflection light receiving tube, the tail end of reflection light receiving tube is arranged in photodetector, the second seal isolation of setting optical window in the reflection light receiving tube before detector, filled with nitrogen in stainless steel tube and reflection light receiving tube between first seal isolation optical window and the second seal isolation optical window.It is designed in measurement feeler lever using without fibre, is space propagation optical path inside the body of rod, improves the reliability of detection bar, diffusing reflection ensure that the stability of gas concentration measurement.

Description

Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar
Technical field
The present invention relates to non-fibers, light path adjustable laser pipeline gas sensor in a kind of detection bar.
Background technique
As country pays more attention to atmosphere pollution, the high-temperature flue gas of the discharges such as each field of electric force, chemical plant is not only tight Lattice control the discharge amount of toxic and harmful gas, also want the moisture content in strict control flue gas, are endangered with preventing from generating in chimney The acidic materials of natural environment.Existing laser smoke moisture instrument, optical patchcord pass through detection bar to the gas chamber of front end, and optical fiber is in bar It is medium-term and long-term uneven by chimney internal and external temperature, light intensity loss is caused, absorption gas chamber of the front end based on mirror-reflection is easily because high temperature occurs Deformation is corroded, and further results in intensity loss or spectrum deformation, causes the unstable and accuracy decline of measurement.
Summary of the invention
The purpose of the present invention is to propose to non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar, detections Optical path is used in bar designs without fibre, and the core devices such as collimator and detector are in except hot environment to be measured, are inside the body of rod For space propagation optical path, the reliability of detection bar is improved, and diffusing reflection is not influenced by mirror angle minor change, is also ensured The stability of gas concentration measurement.
To achieve the goals above, the technical scheme is that
Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar, including the method being connect with tested flue Blue disk, ring flange one side are provided with the stainless steel tube as detection bar, in which: the front end of stainless steel tube is connected with gas chamber connection Cylinder, gas chamber connecting cylinder and the light transmission of stainless steel tube inner hole penetrate through, and the front end of gas chamber connecting cylinder is provided with diffuse reflector, gas chamber connecting cylinder The connection end side of stainless steel tube is provided with the first seal isolation optical window, is formed between the first seal isolation optical window and diffuse reflector Gas effectively absorbs light path section, and the connection end side of stainless steel tube and flange is provided with optical fiber collimator, in ring flange another side Stainless steel tube perforation is provided with reflection light receiving tube, the tail end for reflecting light receiving tube is provided with photodetector, visits in photoelectricity The collector lens of the second seal isolation optical window is provided as in reflection light receiving tube before surveying device, collector lens will be for that will reflect Stainless steel tube and reflected light of the light optically focused on photodetector, between the first seal isolation optical window and the second seal isolation optical window Filled with nitrogen in reception pipe.
Scheme is further: being buckled and is connected with each other by spiral shell between the gas chamber connecting cylinder and stainless steel tube.
Scheme is further: axial order is provided with multiple first seal isolation optical window card slots in gas chamber connecting cylinder, First seal isolation optical window is inserted into the optical path length that the different adjustable gases of card slot effectively absorb light path.
Scheme is further: on the ring flange, being respectively arranged with nitrogen input access port and nitrogen output access port
Compared with the prior art, the present invention designs in bar using without fibre, is space propagation optical path inside the body of rod, improves spy The reliability of measuring staff, and diffusing reflection is not influenced by mirror angle minor change, ensure that the stability of gas concentration measurement.
For laser gas sensor-based system when carrying out high-temperature flue gas environmental gas on-line checking, sensing element directly contacts height Temperature, even has corrosive flue gas at Gao Chen, influences measurement accuracy, while service life is also restrained.It is of the present invention to swash It is variable, resistance to form light path using optics diffuse reflector and plus lens using contactless design for phosgene body sensor measuring bar High temperature is designed to the detection bar of unitary module in conjunction with background gas inflation system without fine gas absorption cell.Detection bar tool There are the multiple advantages such as high temperature resistant, anticorrosive, light path be variable, solves laser gas sensing and asked in the bottleneck that industrial circle is applied Topic.
Compared with electrochemical transducer[sensor, measurement accuracy of the present invention is high, long service life, strong interference immunity;
Compared with semiconductor-type sensors, non-contact measurement of the present invention, not by electromagnetic interference, high reliablity;
Compared with weightening finish method hygrometric, integrated design of the present invention can on-line measurement.
The present invention is described in detail with reference to the accompanying drawings and examples.
Detailed description of the invention
Fig. 1 is inventive structure schematic diagram.
Specific embodiment
Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar are a kind of high reliability without fine, light path Adjustable laser gas sensing detects bar sensor, as shown in Figure 1, non-fiber, light path adjustable laser pipeline gas in the detection bar Body sensor includes: the ring flange 1 connecting with tested flue, and the opposite two sides of ring flange one side therein is provided with As the stainless steel tube 2 of detection bar, the front end of stainless steel tube is connected with gas chamber connecting cylinder 3, in gas chamber connecting cylinder and stainless steel tube Hole light transmission perforation, is provided with diffuse reflector 301, the connection end side of gas chamber connecting cylinder and stainless steel tube in the front end of gas chamber connecting cylinder It is provided with the first seal isolation optical window 302, on the gas chamber connecting cylinder side wall between the first seal isolation optical window and diffuse reflector It is provided with through-hole to be connected to flue, forms gas between such first seal isolation optical window and diffuse reflector and effectively absorb light The connection end side of journey section, stainless steel tube and flange is provided with optical fiber collimator 4, therein another in the opposite two sides of ring flange Side and stainless steel tube perforation are provided with reflection light receiving tube 5, and the tail end of reflection light receiving tube is provided with photodetector 6, The collector lens 7 as the second seal isolation optical window is provided in the reflection light receiving tube before photodetector, optically focused is saturating Mirror is used for reflected light optically focused in photodetector, and the first seal isolation optical window and second seals off between optical window not Filled with nitrogen in rust steel pipe and reflection light receiving tube, on the ring flange, it is respectively arranged with nitrogen input access port 8 and nitrogen Export access port 9.
Wherein: it is buckled and is connected with each other by spiral shell between the gas chamber connecting cylinder and stainless steel tube, diffuse reflector to opto-electronic receiver It is plenum space optical path between device, forms gas between the only first seal isolation optical window and diffuse reflector and effectively absorb light path Section, gas absorb light path effectively for the distance between two times of diffuse reflectors to the first isolation window.
In embodiment: axial order being provided with multiple first seal isolation optical window card slots in gas chamber connecting cylinder, first is close It insulates and is inserted into the optical path length that the different adjustable gases of card slot effectively absorb light path from optical window.
The present embodiment diffuse reflector 301 reflects the laser being emitted by optical fiber collimator, by 2 body of rod of stainless steel tube, by gathering Optical lens 7 converges on detector 6;Diffuse reflector and the first optical window are for testing environment to be measured, the cores such as collimating mirror and detector Heart device is placed in except test environment, is not corroded by adverse circumstances, improves device reliability and service life, the first isolation window and It is filled with nitrogen between second isolation window and forms nitrogen background, to reach protection core element, and under test gas concentration is not interfered to inhale The purpose of receipts.

Claims (4)

1. non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar, including what is connect with tested flue Ring flange, ring flange one side are provided with the stainless steel tube as detection bar, which is characterized in that the front end of stainless steel tube is connected with Gas chamber connecting cylinder, gas chamber connecting cylinder and the light transmission of stainless steel tube inner hole penetrate through, and the front end of gas chamber connecting cylinder is provided with diffuse reflector, gas The connection end side of room connecting cylinder and stainless steel tube is provided with the first seal isolation optical window, the first seal isolation optical window and diffuse reflector Between form gas and effectively absorb light path section, the connection end side of stainless steel tube and flange is provided with optical fiber collimator, in ring flange Another side and stainless steel tube perforation are provided with reflection light receiving tube, and the tail end for reflecting light receiving tube is provided with photodetector, The collector lens of the second seal isolation optical window is provided as in the reflection light receiving tube before photodetector, collector lens is used In the stainless steel tube by reflected light optically focused on photodetector, between the first seal isolation optical window and the second seal isolation optical window With reflection light receiving tube in filled with nitrogen.
2. sensor according to claim 1, which is characterized in that pass through spiral shell between the gas chamber connecting cylinder and stainless steel tube Button is connected with each other.
3. sensor according to claim 1, which is characterized in that be provided in gas chamber connecting cylinder along axial order multiple First seal isolation optical window card slot, the first seal isolation optical window are inserted into the light that the different adjustable gases of card slot effectively absorb light path Journey distance.
4. sensor according to claim 1, which is characterized in that on the ring flange, be respectively arranged with nitrogen input Access port and nitrogen export access port.
CN201910168232.0A 2019-03-06 2019-03-06 Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar Pending CN110031405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910168232.0A CN110031405A (en) 2019-03-06 2019-03-06 Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910168232.0A CN110031405A (en) 2019-03-06 2019-03-06 Non-fiber, light path adjustable laser pipeline gas sensor in a kind of detection bar

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Publication Number Publication Date
CN110031405A true CN110031405A (en) 2019-07-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112924399A (en) * 2019-12-05 2021-06-08 比亚迪半导体股份有限公司 Gas concentration detection device and detection method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6603555B1 (en) * 1999-01-19 2003-08-05 Anritsu Corporation Gas detecting apparatus using laser absorption spectroscopy
CN101042340A (en) * 2007-04-30 2007-09-26 西安交通大学 Detection method for Optical-fiber transmitting infrared absorption type methane gas
CN103245614A (en) * 2013-05-14 2013-08-14 太原理工大学 Intelligent infrared methane gas detection device
CN105158187A (en) * 2015-10-26 2015-12-16 中国人民解放军军事医学科学院卫生装备研究所 On-line monitoring type gas chamber of absorbent-type optical fiber gas sensor
CN206300898U (en) * 2016-11-30 2017-07-04 深圳市唯锐科技有限公司 A kind of compact laser gas sensor
CN107561034A (en) * 2016-06-30 2018-01-09 株式会社堀场制作所 Gas concentration measuring apparatus
CN208187966U (en) * 2018-03-20 2018-12-04 武汉晟诺仪器科技有限公司 Extraction-type laser gas analysis device in situ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6603555B1 (en) * 1999-01-19 2003-08-05 Anritsu Corporation Gas detecting apparatus using laser absorption spectroscopy
CN101042340A (en) * 2007-04-30 2007-09-26 西安交通大学 Detection method for Optical-fiber transmitting infrared absorption type methane gas
CN103245614A (en) * 2013-05-14 2013-08-14 太原理工大学 Intelligent infrared methane gas detection device
CN105158187A (en) * 2015-10-26 2015-12-16 中国人民解放军军事医学科学院卫生装备研究所 On-line monitoring type gas chamber of absorbent-type optical fiber gas sensor
CN107561034A (en) * 2016-06-30 2018-01-09 株式会社堀场制作所 Gas concentration measuring apparatus
CN206300898U (en) * 2016-11-30 2017-07-04 深圳市唯锐科技有限公司 A kind of compact laser gas sensor
CN208187966U (en) * 2018-03-20 2018-12-04 武汉晟诺仪器科技有限公司 Extraction-type laser gas analysis device in situ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112924399A (en) * 2019-12-05 2021-06-08 比亚迪半导体股份有限公司 Gas concentration detection device and detection method

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Application publication date: 20190719

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