CN101865825A - Miniature open optical fiber gas sample cell - Google Patents
Miniature open optical fiber gas sample cell Download PDFInfo
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- CN101865825A CN101865825A CN 201010203247 CN201010203247A CN101865825A CN 101865825 A CN101865825 A CN 101865825A CN 201010203247 CN201010203247 CN 201010203247 CN 201010203247 A CN201010203247 A CN 201010203247A CN 101865825 A CN101865825 A CN 101865825A
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Abstract
The invention discloses a miniature open optical fiber gas sample cell. The sample cell consists of an open unobstructed air passage fixed in a waterproof dustproof protection box and two self-focusing lenses at 5cm intervals in 1/4 period, wherein the two self-focusing lenses realize accurate alignment through two inclination adjusting blocks which are symmetrically arranged outside the side wall of the air passage and form an open gas detection optical path of the sample cell; the unobstructed air passage is communicated with the outside, and the two ends of the air passage is provided with rectangular vent ports; the vent ports are positioned in the middle of a main panel of the protection box and used for ventilating and preventing dust and moisture from entering the sample cell through the air passage; and a replaceable PTFE filter membrane is arranged outside the two vent ports of the box. When outside air current flows to one side of the sample cell, the air current can quickly enter the monitoring optical path of the miniature open optical fiber gas sample cell from any end through the PTFE filter membrane, and flows out from the other end through the PTFE filter membrane due to the run-through effect of the unobstructed symmetrical vent ports, so that the response speed of surrounding environment gas concentration detection is improved.
Description
Technical field
The present invention relates to the sensor assembly of laser spectrum gas measurement instrument, specifically is a kind of miniature open optical fiber gas sample cell that is applicable to that the industry spot multipoint gas concentration is measured.
Background technology
Industrial enterprise can produce some as hazardous gases such as liquefied petroleum gas (LPG), gas, carbon monoxide in its manufacturing process flow, these gases are normally colourless, tasteless, nothing is smelt, and the people is suffocated, even combustion explosion.These hazardous gases hinder breathe and inflammable and explosive characteristic to industrial enterprise safety caused huge threat.Investigation according to a lot of industrial significant explosion accidents, the accident of blasting is mainly relevant by the factors such as awareness of safety, management level, safety technique means and equipment of natural cause, industrial enterprise, and this also reflects also imperfection of present industry spot monitoring of hazardous gas and early warning system.In order to reduce or to avoid explosion accident, crucially need to improve existing industry spot to monitoring of hazardous gas technology such as inflammable and explosive, set up perfect quick early warning system, carry out hazardous gas density real-time monitoring stably in a long term.
The key of industry spot hazardous gas explosion accident early warning is that gas concentration is carried out fast detecting, and the response speed of gas concentration sensor is directly connected to the reliability of industrial safety supervisory system, and accident early warning is played decisive action.Catalytic sensor is China's industry spot gas detection main sensors for a long time, shortcomings such as but poor, anti-toxic that there is anti-high concentration impact property in its catalysis element always is poor, the life-span is short, poor work stability and adjustment are frequent are having a strong impact on long-term normal detection of gas.Fiber gas sensor based on fiber-optic fiber gas absorption spectrum detection technique is a kind of novel Fibre Optical Sensor that tunable semiconductor laser absorption spectrum detection technique is combined with optical fiber sensing technology, have advantages such as little, the easy Installation and Debugging of volume, highly sensitive, quick response, good stability, remote controlled, multimetering, make it become and be applied under the industry spot environment ideal that hazardous gas is carried out real time on-line monitoring and select.
Summary of the invention
The purpose of this invention is to provide a kind of miniature open optical fiber gas sample cell, have the advantages that waterproof and dustproof, volume are little, be easy to safeguard, and open air flue has improved the response speed of gas concentration on-line monitoring.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of miniature open optical fiber gas sample cell, include box-like pond body, it is characterized in that: having perforation pond body and cross section in the body of described pond is the air flue of rectangle, the blow vent of air flue is positioned on two symmetrical sidewalls of described pond body, the center of described pond two other symmetrical sidewall of body has through hole, described through hole is relative on same horizontal line, have the adjustable GRIN Lens of light path to be installed in respectively in the described through hole, outer with being positioned at the pond body separately respectively two single-mode fibers of described GRIN Lens optics one by one are connected.
Described a kind of miniature open optical fiber gas sample cell, it is characterized in that: two sidewall outsides that described pond body has through hole screw togather circular tilt adjustment piece respectively, described tilt adjustment piece center has and the corresponding mounting hole of pond body sidewall through hole, gummed has the GRIN Lens of passing mounting hole, described GRIN Lens to be installed in the through hole of described pond body sidewall in the mounting hole; Be provided with the tilt adjustment screw that runs through the tilt adjustment piece every 90 degree on the described tilt adjustment piece, the single-mode fiber of described outside inserts in the mounting hole and is connected with described GRIN Lens optics.
Described a kind of miniature open optical fiber gas sample cell is characterized in that: fitting respectively on the pond body sidewall at the blow vent place of described air flue is provided with the rectangular seal of circle outside blow vent.
Described a kind of miniature open optical fiber gas sample cell, it is characterized in that: also fit and be provided with the O-ring seals of circle outside through hole in the sidewall outside at body through hole place, described pond, described tilt adjustment piece is screwed on body sidewall outside, pond, and compresses described O-ring seals.
A kind of protection box body of miniature open optical fiber gas sample cell, include rectangular box body and the lid that covers at the box mouth, it is characterized in that: on the described box body sidewall two optical fiber flanges are installed, described miniature open optical fiber gas sample cell is installed in the box body, the sidewall at an one blow vent place and lid are fitted, the box body sidewall that the sidewall at another blow vent place is relative with lid is fitted, described lid, respectively that the sample cell blow vent is the outer rectangular seal of box body sidewall compresses, and described single-mode fiber is connected with the fiber optics of box body outside in the optical fiber flange respectively; Have the ventilation window that communicates with described air hole with the corresponding position of described sample cell blow vent on the relative box body sidewall of described lid, lid, have the filtering briquetting that has filter membrane to be installed in outside the described ventilation window, its filter membrane covers on outside the described ventilation window.
Described a kind of miniature open optical fiber gas sample cell is characterized in that: be respectively arranged with O-ring seal between sidewall that described sample cell and box body, lid are fitted and box body, the lid, also be provided with O-ring seal between box body and the lid.
The present invention utilizes tunable semiconductor laser absorption spectrum detection technique and optical fiber sensing technology, adopts open micro-optical sample cell to carry out a kind of novel optical fiber gas sensor of gas concentration measurement.This micro-optical sample cell is integrated in the protection box that is applicable to industrial environment, mainly is made of open unscreened air flue and a pair of GRIN Lens.When multiple spot is monitored under industrial environment, after laser passes through the optical fiber splitter shunt, import to the minitype gas sample cell of each tested point by single-mode fiber, laser through gas absorption is derived by another single-mode fiber again, and receive by each road detector and to be converted to electric signal, realize the monitoring quick and precisely of gas concentration.
Description of drawings
Fig. 1 sample pool structure front elevation.
Fig. 2 sample pool structure side view.
Fig. 3 sample cell isolating construction side view.
Fig. 4 sample cell and protection box body assembling rear view.
Fig. 5 sample cell protection box body external view.
Fig. 6 sample cell protection box body mounting means synoptic diagram, wherein:
Fig. 6 a is that sidewall is installed, and Fig. 6 b is that ceiling is installed, and Fig. 6 c is that pillar is installed.
Embodiment
Shown in Fig. 1～3.Miniature open optical fiber gas sample cell mainly is made up of pond body and two GRIN Lens 2 at a distance of 1/4 cycle of 5cm of open unscreened air flue 1 centre.Air flue connects with extraneous, interior nothing is blocked, and two ends are rectangle blow vent 3, and body two side, pond has through hole 4 at a distance of 5cm and middle part, relatively also also at a distance of 5cm, it has constituted the gas detection light path of miniature open optical fiber gas sample cell to two GRIN Lens 2 at through hole 4 places.When extraneous air-flow when sample cell one effluent is logical, owing to there is not the perforation effect of the blow vent 3 of the symmetry of blocking, air-flow can enter miniature open optical fiber gas sample cell monitoring light path fast through PTFE filter membrane 25 by any end and flow out through the PTFE filter membrane from the other end, remain the circulation with surrounding enviroment gas, improved response speed the monitoring of surrounding enviroment gas concentration.Two GRIN Lens 11,12 accurate alignings are to be finished by the tilt adjustment piece 5 of outside, air flue 1 two side, each tilt adjustment piece contains 4 tilt adjustment screws 6 and 4 holding screws 7, and be pressed with O shape circle 8 in body sidewall outside, pond, O shape circle 8 herein is in sealing air flue 1, the function that also has the light path tilt adjustment, GRIN Lens 11,12 are passed tilt adjustment piece 5 center mounting holes 9 and are solidified glue and are fixed together, utilize visible red input single-mode fiber 10 during adjusting, when input is exported with GRIN Lens 11 collimations, by regulating the degree of tightness of tilt adjustment screw 6, push O shape circle 8 in different directions and change the collimated light direction, when collimation luminous energy is coupled into output single-mode fiber 13 by output fully with GRIN Lens 12, two GRIN Lens 11,12 are accurately aimed at, regulate holding screw 7 at last again and lock two ends tilt adjustment piece 5, finish the light path of the gas detection light path of miniature open optical fiber gas sample cell and regulate.This mini optical fibre gaseous sample pool structure has greatly improved the coupling and the stability of light intensity, usually intensity loss only is about 0.3dB, solved the light path drifting problem that works long hours and produce, reduced the labile factor in the light path, this Open architecture has been avoided gas sampling simultaneously, is convenient to detection of gas.
As shown in Figure 4.The sample cell 14 that regulates is integrated in the inside of protection box body 15, is connected with box body 15 external fibers 18 by GRIN Lens tail optical fiber 16, box body optical fiber flange 17.When multiple spot is monitored under industrial environment, be along separate routes by optical fiber splitter, allow laser import to the minitype gas sample cell of each tested point that is arranged at the industry spot environment respectively through box body optical fiber flange 17, GRIN Lens tail optical fiber 16 by outside single-mode fiber, laser through gas absorption is exported by another GRIN Lens tail optical fiber again, after box body optical fiber flange 17, the derivation of outside single-mode fiber, receive by each road detector again and be converted to electric signal, realize the stable fast monitored of gas concentration.Module one side is fixed in the inwall of the box body 15 of protecting box by screw 19; opposite side fixes by the lid 21 of screw 20 with the protection box; and all pass through O-ring seal 22 sealings (as shown in Figure 3) between sample cell 14 and box body 15, sample cell 14 and the lid 21, prevent that extraneous steam from being entered in the box body by air flue with air-flow.In addition, also by O-ring seal 23 and extraneous sealing, prevent that extraneous steam from directly entering in the box body, better is applicable to gas-monitoring under the industry spot environment for a long time between box body 15, the lid 21.
As shown in Figure 5.Two ventilation windows 24 of miniature open optical fiber gas sample cell gas channels correspondence are positioned at protection box body and lid middle part; in order to breathe freely and to prevent that dust and steam from entering sample cell by gas channels; the hydrophobic PTFE filter membrane 25 of two blow vent arranged outside at box body; its aperture is 0.22 μ m, and the standard flow rate that gas passes through is 5ml/cm
2.min, the PTFE filter membrane is pressed on the box body by waterproof filter membrane briquetting 26, also only need back out gib screw in later maintenance, takes off waterproof filter membrane briquetting and can clean and change filter membrane easily.
As shown in Figure 6.Sample cell protection box body mounting means commonly used has three kinds, is respectively sidewall and installs, and ceiling is installed, and installs on the pillar.These three kinds of mounting meanss have not only guaranteed the circulation of gas, and are suitable for most scenes.
Claims (6)
1. miniature open optical fiber gas sample cell, include box-like pond body, it is characterized in that: having perforation pond body and cross section in the body of described pond is the air flue of rectangle, the blow vent of air flue is positioned on two symmetrical sidewalls of described pond body, the center of described pond two other symmetrical sidewall of body has through hole, described through hole is relative on same horizontal line, have the adjustable GRIN Lens of light path to be installed in respectively in the described through hole, outer with being positioned at the pond body separately respectively two single-mode fibers of described GRIN Lens optics one by one are connected.
2. a kind of miniature open optical fiber gas sample cell according to claim 1, it is characterized in that: two sidewall outsides that described pond body has through hole screw togather circular tilt adjustment piece respectively, described tilt adjustment piece center has and the corresponding mounting hole of pond body sidewall through hole, gummed has the GRIN Lens of passing mounting hole, described GRIN Lens to be installed in the through hole of described pond body sidewall in the mounting hole; Be provided with the tilt adjustment screw that runs through the tilt adjustment piece every 90 degree on the described tilt adjustment piece, the single-mode fiber of described outside inserts in the mounting hole and is connected with described GRIN Lens optics.
3. a kind of miniature open optical fiber gas sample cell according to claim 1 is characterized in that: fitting respectively on the pond body sidewall at the blow vent place of described air flue is provided with the rectangular seal of circle outside blow vent.
4. a kind of miniature open optical fiber gas sample cell according to claim 1, it is characterized in that: also fit and be provided with the O-ring seals of circle outside through hole in the sidewall outside at body through hole place, described pond, described tilt adjustment piece is screwed on body sidewall outside, pond, and compresses described O-ring seals.
5. the protection box body of a miniature open optical fiber gas sample cell, include rectangular box body and the lid that covers at the box mouth, it is characterized in that: on the described box body sidewall two optical fiber flanges are installed, described miniature open optical fiber gas sample cell is installed in the box body, the sidewall at an one blow vent place and lid are fitted, the box body sidewall that the sidewall at another blow vent place is relative with lid is fitted, described lid, respectively that the sample cell blow vent is the outer rectangular seal of box body sidewall compresses, and described single-mode fiber is connected with the fiber optics of box body outside in the optical fiber flange respectively; Have the ventilation window that communicates with described air hole with the corresponding position of described sample cell blow vent on the relative box body sidewall of described lid, lid, have the filtering briquetting that has filter membrane to be installed in outside the described ventilation window, its filter membrane covers on outside the described ventilation window.
6. a kind of miniature open optical fiber gas sample cell according to claim 5 is characterized in that: be respectively arranged with O-ring seal between sidewall that described sample cell and box body, lid are fitted and box body, the lid, also be provided with O-ring seal between box body and the lid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102032475A CN101865825B (en) | 2010-06-11 | 2010-06-11 | Miniature open optical fiber gas sample cell |
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| CN2010102032475A CN101865825B (en) | 2010-06-11 | 2010-06-11 | Miniature open optical fiber gas sample cell |
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| CN101865825A true CN101865825A (en) | 2010-10-20 |
| CN101865825B CN101865825B (en) | 2012-07-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434670A (en) * | 2011-10-08 | 2012-05-02 | 北京雪迪龙科技股份有限公司 | Sealing method for gas sample tank, gas sample tank and environment monitoring system |
| CN103454222A (en) * | 2013-05-23 | 2013-12-18 | 成都谱视科技有限公司 | Open gas chamber based on optical gas sensing technology |
| CN104634739A (en) * | 2015-01-19 | 2015-05-20 | 中国科学院合肥物质科学研究院 | Dustproof optical detection probe for methane gas |
| CN104914516A (en) * | 2014-03-12 | 2015-09-16 | 安徽中科瀚海光电技术发展有限公司 | Optical coupling module |
| CN110954503A (en) * | 2019-12-18 | 2020-04-03 | 中国科学院合肥物质科学研究院 | In-situ online detection device for laser spectrum of seawater dissolved gas |
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| JPH1096690A (en) * | 1997-10-09 | 1998-04-14 | Agency Of Ind Science & Technol | Apparatus for measuring concentration of carbon monoxide gas |
| JP2007192638A (en) * | 2006-01-18 | 2007-08-02 | New Cosmos Electric Corp | Gas sensor |
| CN101059443A (en) * | 2007-05-31 | 2007-10-24 | 重庆大学 | Optical fiber gas sensor |
-
2010
- 2010-06-11 CN CN2010102032475A patent/CN101865825B/en not_active Expired - Fee Related
Patent Citations (3)
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| JPH1096690A (en) * | 1997-10-09 | 1998-04-14 | Agency Of Ind Science & Technol | Apparatus for measuring concentration of carbon monoxide gas |
| JP2007192638A (en) * | 2006-01-18 | 2007-08-02 | New Cosmos Electric Corp | Gas sensor |
| CN101059443A (en) * | 2007-05-31 | 2007-10-24 | 重庆大学 | Optical fiber gas sensor |
Non-Patent Citations (2)
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| 《仪表技术与传感器》 20070331 撒继铭等 基于自聚焦透镜的吸收型光纤气体传感器气室设计 11-12 1-6 , 第3 期 2 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434670A (en) * | 2011-10-08 | 2012-05-02 | 北京雪迪龙科技股份有限公司 | Sealing method for gas sample tank, gas sample tank and environment monitoring system |
| CN102434670B (en) * | 2011-10-08 | 2015-08-12 | 北京雪迪龙科技股份有限公司 | A kind of gas sample cell encapsulating method, gas sample cell and environmental monitoring system |
| CN103454222A (en) * | 2013-05-23 | 2013-12-18 | 成都谱视科技有限公司 | Open gas chamber based on optical gas sensing technology |
| CN103454222B (en) * | 2013-05-23 | 2016-03-16 | 成都谱视科技有限公司 | A kind of open air chamber based on optical gas sensing technology |
| CN104914516A (en) * | 2014-03-12 | 2015-09-16 | 安徽中科瀚海光电技术发展有限公司 | Optical coupling module |
| CN104914516B (en) * | 2014-03-12 | 2017-03-15 | 安徽中科瀚海光电技术发展有限公司 | Optical coupler module |
| CN104634739A (en) * | 2015-01-19 | 2015-05-20 | 中国科学院合肥物质科学研究院 | Dustproof optical detection probe for methane gas |
| CN104634739B (en) * | 2015-01-19 | 2017-03-08 | 中国科学院合肥物质科学研究院 | A kind of dust-proof methane gas optical detection probe |
| CN110954503A (en) * | 2019-12-18 | 2020-04-03 | 中国科学院合肥物质科学研究院 | In-situ online detection device for laser spectrum of seawater dissolved gas |
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| CN101865825B (en) | 2012-07-11 |
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