CN101936886A - Experiment device for optical fiber gas sensor - Google Patents
Experiment device for optical fiber gas sensor Download PDFInfo
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- CN101936886A CN101936886A CN 201010244219 CN201010244219A CN101936886A CN 101936886 A CN101936886 A CN 101936886A CN 201010244219 CN201010244219 CN 201010244219 CN 201010244219 A CN201010244219 A CN 201010244219A CN 101936886 A CN101936886 A CN 101936886A
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Abstract
The invention discloses an experiment device for an optical fiber gas sensor. Four sliding seats are arranged on a sliding rail; the sliding seat at the left end is provided with an incident terminal bracket of an optical fiber collimator; the incident terminal bracket is provided with an optical fiber incident terminal; two intermediate sliding seats are respectively provided with a gas chamber lifting rack, wherein a V-shaped mounting seat is arranged at the top of each gas chamber lifting rack; the V-shaped mounting seat is provided with a glass gas chamber; the sliding seat at the right end is provided with a mobile station; and a reflecting terminal lifting rack of an optical fiber reflecting terminal is arranged at the upper end of the mobile station. The invention has the advantages of simple structure, low energy consumption, low cost, simple experiment operation, safety, easy maintenance and the like, can be used for researching the relationship of the length change of the gas chamber and the gas concentration and the relationship of the diameter change of the gas chamber and the gas concentration and can be used in the environments of opening gas to be measured and closed gas to be measured for experiment research and scientific research.
Description
Technical field
The invention belongs to the gas sensing technical field, be specifically related to a kind of optical fiber absorption type gas sensor experimental provision.
Background technology
The optical fiber gas sensing technology is to follow the development of Fibre Optical Communication Technology the seventies in 20th century and what develop rapidly is that carrier, optical fiber are medium perception and the novel sensing technology that transmits extraneous measured signal with the light wave, in a plurality of fields such as commercial production, environmental monitoring and medical science wide application prospect is arranged.Compare with traditional electric formula sensor, fiber gas sensor have essential safety, highly sensitive, measuring accuracy is high, response speed is fast, dynamic range is big, anti-electromagnetic interference capability is realized advantages such as remote measurement by force and easily, suit especially to be subjected to work online continuously under the rugged surroundings such as strict restriction and strong electromagnetic in various poisonous, harmful, inflammable, explosive, spaces, so the research of fiber gas sensor all is subjected to paying attention to widely, become the focus of present gas sensor research at home and abroad.For the ease of the characteristic research of absorption type gas sensing, the current technical issues that need to address are a kind of optical fiber gas sensing head experimental provisions of development.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of reasonable in design, simple in structure, easy to operate fiber gas sensor experimental provision.
Solving the problems of the technologies described above the technical scheme that is adopted is: be provided with 4 slides at slide rail, the incident terminal support that optical fiber collimator is installed is set on the slide of left end, the optical fiber input terminal that front end face is equipped with incident terminal glass sheet is set on the incident terminal support, be respectively arranged with the air chamber crane that the top is equipped with the V-arrangement mount pad on 2 slides at middle part, the V-arrangement mount pad is provided with the glass air chamber, the slide of right-hand member is provided with transfer table, and the reflection terminal crane that the upper end is equipped with the fiber reflection terminal is set on the transfer table.
Optical fiber input terminal of the present invention, glass air chamber, fiber reflection terminal are positioned on same the horizontal optical axis.
Fiber reflection terminal of the present invention is: the front end face of housing is provided with reflection terminal glass sheet, reflection terminal glass sheet back is provided with plano-concave lens, the back of housing is provided with the fixed block that is fixed on the crane top, center between fixed block and housing is provided with steel ball, each inwardly is processed with corresponding 4 pickup grooves that vertically are arranged on the same straight line in position on housing rear end face and the fixed block front end face, in the bottom of each pickup groove the extension spring fixed bar is installed, be connected with extension spring between extension spring fixed bar in housing and the extension spring fixed bar in fixed block, the set screw of 2 ends and housing overlap joint is set on the fixed block.
Glass air chamber of the present invention is: be provided with valve at the glass tube two ends, the tracheae that the sealing pipe clamp is housed be set on the valve, the two ends of glass tube are provided with and are parallel to each other, with the included angle of upright plane be 3 °～10 ° seal glass sheet.
The diameter of plano-concave lens of the present invention is that 25.4mm, focal length are that 150～200mm, thickness are 4～5mm, and the distance of glass sheet and plano-concave lens is 3～8mm.
The present invention adopts light source to incide optical fiber collimator through incident optical, enter from the light of optical fiber collimator outgoing from the left end of glass air chamber, right-hand member injects to the fiber reflection terminal, reflect into into the optical fiber collimating apparatus through the fiber reflection terminal, enter the output of outgoing optical fiber again.That the present invention has is simple in structure, can loss little, advantages such as cost is low, experimental implementation is simple, safety and easy care.Can in the gaseous environment to be measured of the opening of experimental teaching and scientific research gaseous environment to be measured and sealing, use.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1.
Fig. 2 is the structural representation of fiber reflection terminal 6 among Fig. 1.
Fig. 3 is the scheme of installation of glass air chamber 4 end seal glass sheet among Fig. 1.
Embodiment
The present invention is described in more detail with each embodiment below in conjunction with accompanying drawing, but the invention is not restricted to these embodiment.
Embodiment 1
In Fig. 1, the fiber gas sensor experimental provision of present embodiment is made of optical fiber collimator 1, optical fiber input terminal 2, air chamber crane 3, glass air chamber 4, V-arrangement mount pad 5, fiber reflection terminal 6, traveling platform 7, screw rod swivel nut parallel moving mechanism 8, transfer table 9, slide 10, reflection terminal crane 11, scale 12, slide rail 13, incident terminal support 14,15 connections of incident terminal glass sheet.
As shown in Figure 1, respectively have the female blind hole of a processing in the bottom at slide rail 13 two ends of the rectangular structure of rectangle, blind hole internal thread is connected with lifting bolt, scale 12 is attached on the leading flank of slide rail 13, the slide 10 that moves along slide rail 13 of 4 rectangles is installed on the slide rail 13, and the bottom of slide 10 is processed with identical with slide rail 13 width groove, and slide 10 is placed on the slide rail 13, slide 10 can be carved with the aligning groove along slide rail 13 move left and right on the leading flank of slide 10.The bottom welding of incident terminal support 14 is connected in the center of the slide 10 that is positioned at slide rail 13 high order ends, the top of incident terminal support 14 is semicircle, the bottom is a rectangle, the housing welding of optical fiber input terminal 2 is connected in the top of incident terminal support 14, fixedly be coated with the incident terminal glass sheet 15 of anti-reflection film on the front end face of optical fiber input terminal 2 with trip bolt, the effect of anti-reflection film is the loss that reduces the light energy output that causes owing to the glass sheet surface reflection, the anti-reflection film of present embodiment incident terminal glass sheet 15 surface platings is a magnesium fluoride, 3 layers of vacuum evaporations, the center on incident terminal support 14 tops is equipped with the optical fiber collimator 1 that passes optical fiber input terminal 2 housing centers.Each welding of center position that is positioned at two slides 10 at slide rail 13 middle parts is connected with an air chamber crane 3, air chamber crane 3 is conventional design in the Machine Design, promptly constitute by elevating lever and elevating lever cover, elevating lever can move up and down in the elevating lever cover, by thread connection trip bolt is installed on the elevating lever cover outer wall, after the position that elevating lever moves up and down in the elevating lever cover is determined, fix with trip bolt.The top welding of air chamber crane 3 is connected with V-arrangement mount pad 5, and slipmat is posted in the inboard of V-arrangement mount pad 5, and horizontal glass air chamber 4 is placed on the V-arrangement mount pad 5.The bottom of traveling platform 7 is fixed on the slide 10 that is positioned at slide rail 13 low order ends with the screw threads for fastening connector, traveling platform 7 is wide with slide rail 13, the upper surface of traveling platform 7 be processed with two with the perpendicular groove of slide rail 13, transfer table 9 is placed on the traveling platform 7, the lower surface of transfer table 9 is processed with corresponding two fins of groove on two positions and the traveling platform 7, the fin of transfer table 9 lower surfaces is embedded in the groove of traveling platform 7 upper surfaces, the front end of transfer table 9 is equipped with screw rod swivel nut parallel moving mechanism 8, screw rod swivel nut parallel moving mechanism 8 is the conventional design in the Machine Design, promptly regulate screw knob by displacement and constitute with the thread bush that is fixed on transfer table 9 inside, swing offset is regulated screw knob makes transfer table 9 move along the direction front and back on traveling platform 7 perpendicular to slide rail 13.Welding connects reflection terminal crane 11 on the center of transfer table 9, and the top welding of reflection terminal crane 11 is connected with fiber reflection terminal 6, and optical fiber input terminal 2, glass air chamber 4, fiber reflection terminal 6 are positioned on same the horizontal optical axis.
As shown in Figure 2, the fiber reflection terminal 6 of present embodiment is made of housing 6-1, reflection terminal glass sheet 6-2, plano-concave lens 6-3, fixed block 6-4, extension spring 6-5, steel ball 6-6, pickup groove 6-7, extension spring fixed bar 6-8, set screw 6-9 connection.
On the front end face of housing 6-1, reflection terminal glass sheet 6-2 is installed with trip bolt, reflection terminal glass sheet 6-2 goes up vacuum evaporation anti-reflection film, the effect of anti-reflection film is the loss that reduces the light energy output that causes owing to the glass sheet surface reflection, the anti-reflection film of present embodiment is a magnesium fluoride, 3 layers of vacuum evaporations, the back of reflection terminal glass sheet 6-2 is equipped with plano-concave lens 6-3, the diameter of plano-concave lens 6-3 is that 150mm, thickness are 4.3mm for the 25.4mm focal length, and the distance of reflection terminal glass sheet 6-2 and plano-concave lens 6-3 is 4mm.The back of housing 6-1 is provided with fixed block 6-4, fixed block 6-4 is the cylindrical of axis horizontal, the bottom welding of fixed block 6-4 is connected in the top of reflection terminal crane 11, center position between fixed block 6-4 and housing 6-1 is provided with steel ball 6-6, connects by 4 extension spring 6-5 between fixed block 6-4 and the housing 6-1.Each inwardly is processed with corresponding 4 the pickup groove 6-7 that vertically are arranged on the same straight line in position on the front end face of the rear end face of housing 6-1 and fixed block 6-4, be connected with extension spring fixed bar 6-8 in the welding of the bottom of each pickup groove 6-7, the end of extension spring 6-5 is installed on the interior extension spring fixed bar 6-8 of housing 6-1, the other end is installed on the interior extension spring fixed bar 6-8 of fixed block 6-4.Be processed with on the fixed block 6-4 2 vertically arrange in the vertical through hole of swivel nut is installed, set screw 6-9 is installed in the swivel nut in the through hole by thread connection, the rear end face overlap joint of the front end of set screw 6-9 and housing 6-1, the angle that rotation set screw 6-9 can regulate fiber reflection terminal 6.
As shown in figures 1 and 3, the glass air chamber 4 of present embodiment is made of glass tube 4-1, valve 4-2, sealing pipe clamp 4-3, tracheae 4-4, seal glass sheet 4-5 connection.Axial two outsides at glass tube 4-1 are manufactured with the valve 4-2 that is connected as a single entity with glass tube 4-1, tracheae 4-4 is installed on the valve 4-2, tracheae 4-4 is connected with tested gas, tracheae sealing pipe clamp 4-3 is installed on the tracheae 4-4, tracheae sealing pipe clamp 4-3 is used for the gas that enters in the glass tube 4-1 is closed or opened, the two ends of glass tube 4-1 stick with glue be connected to be parallel to each other, with the included angle of upright plane be 6 ° seal glass sheet 4-5.The glass tube 4-1 of present embodiment can adopt the pipe that diameter is identical, length is different, also can adopt length identical, and the pipe that diameter is different can be selected the glass tube 4-1 of different length different-diameter for use doing different experiments.The glass air chamber 4 of this structure can reduce the loss of light by glass air chamber 4.
Embodiment 2
In the present embodiment, the seal glass sheet 4-5 at glass air chamber 4 two ends and the included angle of upright plane are 3 °, and the connecting relation of all the other parts and parts is identical with embodiment's 1.
Embodiment 3
In the present embodiment, the seal glass sheet 4-5 at glass air chamber 4 two ends and the included angle of upright plane are 10 °, and the connecting relation of all the other parts and parts is identical with embodiment's 1.
Embodiment 4
In above embodiment 1～3, the diameter of the plano-concave lens 6-3 of plano-concave lens 6-3 is that 25.4mm, focal length are that 150mm, thickness are 5mm, and the distance of reflection terminal glass sheet 6-2 and plano-concave lens 6-3 is 3mm.The connecting relation of all the other parts and parts is identical with respective embodiments.
Embodiment 5
In above embodiment 1～3, the diameter of the plano-concave lens 6-3 of plano-concave lens 6-3 is that 25.4mm, focal length are that 200mm, thickness are 4mm, and the distance of reflection terminal glass sheet 6-2 and plano-concave lens 6-3 is 8mm.The connecting relation of all the other parts and parts is identical with respective embodiments.
The course of work of the present invention is as follows:
During experiment, gas to be measured is filled in the glass air chamber 4, with the tracheae 4-4 on the sealing pipe clamp 4-3 seal glass air chamber 4, the rotation and lifting bolt is adjusted slide rail 13 to level, with optical fiber input terminal 2, fiber reflection terminal 6, V-arrangement mount pad 5 is adjusted to the height that needs, glass air chamber 4 is placed on the V-arrangement mount pad 5, light source incides in the optical fiber collimator 1 through incident optical, enter from the left end of glass air chamber 4 from the light of optical fiber collimator 1 outgoing, right-hand member comes out, penetrate on fiber reflection terminal 6, adjust the elevating lever 3 and the set screw 6-9 of fiber reflection terminal 6 belows, light is converged and reflect into into optical fiber collimating apparatus 1, enter outgoing optical fiber again, survey gas to be measured intensity variations after glass air chamber 4 absorbs by spectroanalysis instrument at last, obtain the concentration of gas to be measured.
The present invention can use in open gaseous environment to be measured, also can be placed in the gaseous environment to be measured of sealing and use, have that machinery and optical texture are simple, loss is little, cost is low, experimental implementation is simple, advantage such as safety and easy care, be suitable for experimental teaching and scientific research, not only can study the variation of air chamber length and the relation of gas concentration, and can study the relation of air chamber diameter variation and gas concentration.As long as select different wavelength of laser light source and the optical fiber collimator 1 higher, can study the absorption characteristic of gas with various easily and flexibly to this wavelength coupling efficiency; And the tilt adjustment function of fiber reflection terminal 6 more can realize converging and the coupling of aiming at of light reflected and optical fiber collimator 1 of light easily.
In order to verify beneficial effect of the present invention, the inventor adopts the fiber gas sensor experimental provision of the embodiment of the invention 1 preparation chamber research experiment that experimentizes, and various experiment situations are as follows:
Experimental apparatus: distributed feedback type semiconductor laser, model are IPDFD1601 type light source, are produced by American I nPhenix company; Spectroanalysis instrument, model are MS9710C, are produced by Japanese Anritsu company.
1, low-concentration methane gas experiment
Measure the relation of the relative variation of concentration of low-concentration methane gas with light intensity with experimental provision of the present invention, the methane adsorption spectral line of choosing 1665.57nm is as measuring spectral line, regulate attemperating unit, the centre wavelength of light source is aimed at absorption line and the locking of choosing, with the peak power relative variation of spectroanalysis instrument detection absorption peak, with this relative variation as light intensity.Experimental data is as shown in table 1.
The variable quantity of the light intensity of table 1 variable concentrations methane gas
| Concentration of methane gas (%) | ?0 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 | 5.5 | 6.0 |
| Light intensity relative variation (%) | ?0 | 1.3 | 2.4 | 3.4 | 4.5 | 5.6 | 6.7 | 7.7 | 8.8 | 9.8 | 10.9 | 12 | 13.1 |
As shown in Table 1, the concentration value of the relative variation of light intensity and methane gas is linear.
2, acetylene gas experiment
Measure the concentration of acetylene gas and the relation of absorption line peak power with experimental provision of the present invention, acetylene gas has 50 tangible absorption lines between 1510nm～1540nm, the stronger spectral line of this 3 root absorption of this experimental selection 1533.01nm, 1534.27nm and 1535.57nm is measured the relation of concentration and absorption line peak power.Adopt wideband light source, the fiber grating coupling is surveyed the variation of peak power with spectrometer.Experimental result is as shown in table 2.
The relation table of table 2. acetylene gas concentration and absorption line peak power
As shown in Table 2, the concentration of spectral line peak power and acetylene gas is linear.
Claims (5)
1. fiber gas sensor experimental provision, it is characterized in that: be provided with 4 slides (10) at slide rail (13), the slide of left end (10) is gone up the incident terminal support (14) that optical fiber collimator (1) is installed is set, the optical fiber input terminal (2) that front end face is equipped with incident terminal glass sheet (15) is set on the incident terminal support (14), be respectively arranged with the air chamber crane (3) that the top is equipped with V-arrangement mount pad (5) on 2 slides (10) at middle part, V-arrangement mount pad (5) is provided with glass air chamber (4), the slide of right-hand member (10) is provided with transfer table (9), and the reflection terminal crane (11) that the upper end is equipped with fiber reflection terminal (6) is set on the transfer table (9).
2. according to the described fiber gas sensor experimental provision of claim 1, it is characterized in that: said optical fiber input terminal (2), glass air chamber (4), fiber reflection terminal (6) are positioned on same the horizontal optical axis.
3. according to claim 1 or 2 described fiber gas sensor experimental provisions, it is characterized in that said fiber reflection terminal (6) is: the front end face of housing (6-1) is provided with reflection terminal glass sheet (6-2), reflection terminal glass sheet (6-2) back is provided with plano-concave lens (6-3), the back of housing (6-1) is provided with the fixed block (6-4) that is fixed on crane (3) top, center between fixed block (6-4) and housing (6-1) is provided with steel ball (6-6), each inwardly is processed with corresponding 4 pickup grooves (6-7) that vertically are arranged on the same straight line in position on housing (6-1) rear end face and fixed block (6-4) front end face, in the bottom of each pickup groove (6-7) extension spring fixed bar (6-8) is installed, be connected with extension spring (6-5) between extension spring fixed bar (6-8) in housing (6-1) and the extension spring fixed bar (6-8) in fixed block (6-4), the set screw (6-9) of 2 ends and housing (6-1) overlap joint is set on the fixed block (6-4).
4. according to the described fiber gas sensor experimental provision of claim 1, it is characterized in that said glass air chamber (4) is: be provided with valve (4-2) at the two ends of glass tube (4-1), valve (4-2) go up to be provided with the tracheae (4-4) that sealing pipe clamp (4-3) is housed, the two ends of glass tube (4-1) are provided with and are parallel to each other, with the included angle of upright plane be 3 °～10 ° seal glass sheet (4-5).
5. according to the described fiber gas sensor experimental provision of claim 3, the diameter that it is characterized in that said plano-concave lens (6-3) is that 25.4mm, focal length are that 150～200mm, thickness are 4～5mm, and glass sheet (6-2) is 3～8mm with the distance of plano-concave lens (6-3).
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| CN101936886B CN101936886B (en) | 2012-07-25 |
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Cited By (7)
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| CN105136708A (en) * | 2015-10-16 | 2015-12-09 | 南京信息工程大学 | Three-component motor vehicle exhaust remote detection device |
| CN105466461A (en) * | 2015-12-17 | 2016-04-06 | 天津求实飞博科技有限公司 | Wavelength demodulation device |
| CN107870165A (en) * | 2016-09-27 | 2018-04-03 | 福州高意光学有限公司 | The Raman fiber optic probe that a kind of special fiber makes |
| CN108375555A (en) * | 2018-02-28 | 2018-08-07 | 山东微感光电子有限公司 | Optical fiber methane sensing module, optical fiber multiple spot photo-electric methane transducer and system |
| CN109405726A (en) * | 2018-10-09 | 2019-03-01 | 三英精控（天津）仪器设备有限公司 | A kind of nanometer displacement capacitance sensor test clamping device |
| CN110261348A (en) * | 2019-07-04 | 2019-09-20 | 中南林业科技大学 | Near infrared spectrum fruit internal quality detection device |
| CN114441447A (en) * | 2021-12-31 | 2022-05-06 | 呼和浩特科林热电有限责任公司 | Air chamber for sulfur hexafluoride detection |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136708A (en) * | 2015-10-16 | 2015-12-09 | 南京信息工程大学 | Three-component motor vehicle exhaust remote detection device |
| CN105136708B (en) * | 2015-10-16 | 2018-03-09 | 南京信息工程大学 | A kind of three component motor-vehicle tail-gas remote detection devices |
| CN105466461A (en) * | 2015-12-17 | 2016-04-06 | 天津求实飞博科技有限公司 | Wavelength demodulation device |
| CN107870165A (en) * | 2016-09-27 | 2018-04-03 | 福州高意光学有限公司 | The Raman fiber optic probe that a kind of special fiber makes |
| CN108375555A (en) * | 2018-02-28 | 2018-08-07 | 山东微感光电子有限公司 | Optical fiber methane sensing module, optical fiber multiple spot photo-electric methane transducer and system |
| CN109405726A (en) * | 2018-10-09 | 2019-03-01 | 三英精控（天津）仪器设备有限公司 | A kind of nanometer displacement capacitance sensor test clamping device |
| CN110261348A (en) * | 2019-07-04 | 2019-09-20 | 中南林业科技大学 | Near infrared spectrum fruit internal quality detection device |
| CN110261348B (en) * | 2019-07-04 | 2021-06-22 | 中南林业科技大学 | Near infrared spectrum fruit internal quality detection device |
| CN114441447A (en) * | 2021-12-31 | 2022-05-06 | 呼和浩特科林热电有限责任公司 | Air chamber for sulfur hexafluoride detection |
| CN114441447B (en) * | 2021-12-31 | 2023-11-28 | 呼和浩特科林热电有限责任公司 | Air chamber based on sulfur hexafluoride detects usefulness |
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