CN101865825B - Miniature open optical fiber gas sample cell - Google Patents
Miniature open optical fiber gas sample cell Download PDFInfo
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- CN101865825B CN101865825B CN2010102032475A CN201010203247A CN101865825B CN 101865825 B CN101865825 B CN 101865825B CN 2010102032475 A CN2010102032475 A CN 2010102032475A CN 201010203247 A CN201010203247 A CN 201010203247A CN 101865825 B CN101865825 B CN 101865825B
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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 like 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, key needs to improve existing industry spot to monitoring of hazardous gas technology such as inflammable and explosive, sets up perfect quick early warning system, carries 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 volume little, be prone to advantages such as Installation and Debugging, 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 scheme that the present invention adopted 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 said pond is the air flue of rectangle; The blow vent of air flue is positioned on two symmetrical sidewalls of said pond body, and the center of said pond two other symmetrical sidewall of body has through hole, and said through hole is relative on same horizontal line; Have the adjustable GRIN Lens of light path to be installed in respectively in the said through hole, outer with being positioned at the pond body separately respectively two single-mode fibers of said 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 said pond body has through hole screw togather circular tilt adjustment piece respectively; Said tilt adjustment piece center has and the corresponding mounting hole of pond body sidewall through hole; Gummed has the GRIN Lens that passes mounting hole, said GRIN Lens to be installed in the through hole of said pond body sidewall in the mounting hole; Whenever be provided with the tilt adjustment screw that runs through the tilt adjustment piece at a distance from 90 degree on the said tilt adjustment piece, the single-mode fiber of said outside inserts in the mounting hole and is connected with said 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 said 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 said pond body through hole place; It is outside that said tilt adjustment piece is screwed on pond body sidewall, and compress said O-ring seals.
A kind of protection box body of miniature open optical fiber gas sample cell; Include the rectangular box body and cover lid at the box mouth; It is characterized in that: on the said box body sidewall two optical fiber flanges are installed; Said miniature open optical fiber gas sample cell is installed in the box body, and the sidewall and the lid at an one of which blow vent place are fitted, and the box body sidewall that the sidewall at another blow vent place is relative with lid is fitted; Respectively that the sample cell blow vent is the outer rectangular seal of said lid, box body sidewall compresses, and said single-mode fiber is connected with the outside fiber optics of box body in the optical fiber flange respectively; Have the ventilation window that communicates with said air hole with the corresponding position of said sample cell blow vent on the relative box body sidewall of said lid, lid, have the filtering briquetting that has filter membrane to be installed in outside the said ventilation window, its filter membrane covers on outside the said 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 said 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 up 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 converts electric signal into by each road detector reception, realizes 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 get into 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.It is to be accomplished by the outside tilt adjustment piece 5 in air flue 1 two side that two GRIN Lens 11,12 are accurately aimed at; Each tilt adjustment piece contains 4 tilt adjustment screws 6 and 4 holding screws 7, and body sidewall outside is pressed with O shape circle 8 in the pond, and the O shape circle 8 here is in sealing air flue 1; The function that also has the light path tilt adjustment; 11,12 of GRIN Lens pass tilt adjustment piece 5 center mounting holes 9 and are solidified glue fixing together, utilize the visible red input with single-mode fiber 10 during adjusting, when input is exported with GRIN Lens 11 collimations; Through 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 was coupled into output single-mode fiber 13 by output with GRIN Lens 12 fully, two GRIN Lens 11,12 were accurately aimed at; Regulate holding screw 7 at last again and lock two ends tilt adjustment piece 5, accomplish 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 losses is merely 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 through GRIN Lens tail optical fiber 16, box body optical fiber flange 17.When multiple spot is monitored under industrial environment; Be along separate routes through optical fiber splitter; Let 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 convert electric signal into, realize the stable fast monitored of gas concentration.Module one side is fixed in the inwall of the box body 15 of protecting box through screw 19; Opposite side fixes through 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 got in the box body by air flue with air-flow.In addition, also through O-ring seal 23 and extraneous sealing, prevent that extraneous steam from directly getting 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.The two ventilation windows 24 that the miniature open optical fiber gas sample cell gas channels is corresponding are positioned at protection box body and lid middle part; In order to breathe freely and to prevent that dust and steam from getting into 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, in later maintenance, also only need back out gib screw, 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 (5)
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 said pond is the air flue of rectangle; The blow vent of air flue is positioned on two symmetrical sidewalls of said pond body, and the center of said pond two other symmetrical sidewall of body has through hole, and said through hole is relative on same horizontal line; Have the adjustable GRIN Lens of light path to be installed in respectively in the said through hole, outer with being positioned at the pond body separately respectively two single-mode fibers of said GRIN Lens optics one by one are connected;
Two sidewall outsides that said pond body has through hole screw togather circular tilt adjustment piece respectively; Said tilt adjustment piece center has and the corresponding mounting hole of pond body sidewall through hole; Gummed has the GRIN Lens that passes mounting hole, said GRIN Lens to be installed in the through hole of said pond body sidewall in the mounting hole; Whenever be provided with the tilt adjustment screw that runs through the tilt adjustment piece at a distance from 90 degree on the said tilt adjustment piece, the single-mode fiber of said outside inserts in the mounting hole and is connected with said GRIN Lens optics.
2. 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 said air flue is provided with the rectangular seal of circle outside blow vent.
3. 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 said pond body through hole place; It is outside that said tilt adjustment piece is screwed on pond body sidewall, and compress said O-ring seals.
4. the protection box body of a miniature open optical fiber gas sample cell as claimed in claim 1; Include the rectangular box body and cover lid at the box mouth; It is characterized in that: on the said box body sidewall two optical fiber flanges are installed; Said miniature open optical fiber gas sample cell is installed in the box body, and the sidewall and the lid at an one of which blow vent place are fitted, and the box body sidewall that the sidewall at another blow vent place is relative with lid is fitted; Respectively that the sample cell blow vent is the outer rectangular seal of said lid, box body sidewall compresses, and said single-mode fiber is connected with the outside fiber optics of box body in the optical fiber flange respectively; Have the ventilation window that communicates with said blow vent with the corresponding position of said sample cell blow vent on the relative box body sidewall of said lid, lid, have the filter membrane briquetting that has filter membrane to be installed in outside the said ventilation window, its filter membrane covers on outside the said ventilation window.
5. the protection box body of miniature open optical fiber gas sample cell according to claim 4 is characterized in that: be provided with O-ring seal between said sample cell and the lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102032475A CN101865825B (en) | 2010-06-11 | 2010-06-11 | Miniature open optical fiber gas sample cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102032475A CN101865825B (en) | 2010-06-11 | 2010-06-11 | Miniature open optical fiber gas sample cell |
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| CN101865825A CN101865825A (en) | 2010-10-20 |
| CN101865825B true CN101865825B (en) | 2012-07-11 |
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| CN2010102032475A Expired - Fee Related CN101865825B (en) | 2010-06-11 | 2010-06-11 | Miniature open optical fiber gas sample cell |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3289137B2 (en) * | 1997-10-09 | 2002-06-04 | 独立行政法人産業技術総合研究所 | Carbon monoxide gas concentration measurement device |
| JP4758769B2 (en) * | 2006-01-18 | 2011-08-31 | 新コスモス電機株式会社 | Gas detector |
| CN100567965C (en) * | 2007-05-31 | 2009-12-09 | 重庆大学 | A kind of fiber gas sensor |
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