CN105466855B - Sample detection means based on Herriott multiple reflecting pool - Google Patents
Sample detection means based on Herriott multiple reflecting pool Download PDFInfo
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- CN105466855B CN105466855B CN201511023636.9A CN201511023636A CN105466855B CN 105466855 B CN105466855 B CN 105466855B CN 201511023636 A CN201511023636 A CN 201511023636A CN 105466855 B CN105466855 B CN 105466855B
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
Abstract
The invention discloses a kind of sample detection means based on Herriott multiple reflecting pool, including：Detection pipe, detection pipe installs incident reflecting mirror, outgoing reflecting mirror along axial both ends respectively, and the inner cavity of detection pipe is as sensing chamber；Detection pipe is equipped with the air inlet and air outlet being connected to sensing chamber；Incident reflecting mirror is fixed on one end of detection pipe, and offers entrance aperture on the mirror surface of incident reflecting mirror；Outgoing reflecting mirror is set to the other end of detection pipe, the light injected through entrance aperture carries out multiple reflections on two relative speculars of incident reflecting mirror and outgoing reflecting mirror, and is emitted on the mirror surface of reflecting mirror and opens up for the beam projecting after multiple reflections by the received light passing window of optical detection device.Its structure is simple, installation is convenient and manufacturing cost is low, and light path is adjustable, is easily achieved, and without individually adding deviator, since entrance aperture, light passing window are located at the both ends of detection pipe axial direction, convenient for the installation of light emitting devices and optical detection device.
Description
Technical field
The present invention relates to field of gas detection, particularly, are related to a kind of sample inspection based on Herriott multiple reflecting pool
Survey device.
Background technique
In sample detection, in order to improve Monitoring lower-cut, increases light path and be very effective one of method；Increase light path
There are many method, have the pond White and the pond Herriott etc. than more typical.For example, application No. is the hairs of CN200810246800.6
Bright patent discloses a kind of multiple reflections device based on White pool structure.White pool structure is simple, it is only necessary to two pieces of concave surfaces
Mirror, and reflection light point spaced apart reduces the generation of interference, is also widely used on two mirror surfaces.But it has
There is angular aperture small, is not easy to adjust, the installation of incident smaller and inconvenient with reflected light angle laser and detector, while to mirror
Position accuracy demand is very high between piece, and light path is usually unadjustable.Application No. is the invention of CN201110091139.8 is special
Benefit discloses a kind of gas detection platform using Herriott multiple reflections sample room, and deviator is arranged in inner cavity, right
Incident light and outgoing light direction are controlled, and this method can be well solved incident light and the too small problem of emergent light angle, but
It is to have the following disadvantages：1. deviator can occupy certain inner space, the volume of sample room is increased, while influencing the anti-of light
Number is penetrated, prevents mirror mirror from making full use of；2. the design structure is complex, installation is not convenient enough, while anti-to two
The cooperation requirement penetrated between eyeglass is very high；3. the device light path is substantially to be fixed, can not accomplish adjustable.4. due to increasing more
Two pieces of deflecting reflecting mirrors, cost is also opposite to be will increase.
In view of the above deficiencies, in order to reduce processing, installation accuracy require and environmental change to Herriott multiple reflections
The influence in pond, and realize the adjustable to meet detection demand of light path, it needs to design a kind of novel based on Herroit multiple reflections
The sample detection means in pond.
Summary of the invention
The present invention provides a kind of sample detection means based on Herriott multiple reflecting pool, to solve existing sample
The processing of detection device, installation accuracy require influence of the high and environmental change to Herriott multiple reflecting pool or need list
Solely add that mirror mirror caused by deviator cannot make full use of, structure is complicated, installation fitness is high and manufacturing cost is high
The technical issues of.
The technical solution adopted by the present invention is as follows：
A kind of sample detection means based on Herriott multiple reflecting pool, including：Detection pipe, detection pipe is along axial two
Incident reflecting mirror, outgoing reflecting mirror are installed in end respectively, and the inner cavity of detection pipe is as sensing chamber；
Detection pipe is equipped with the air inlet and air outlet being connected to sensing chamber, and air inlet is for being passed through sample to be tested gas, out
Port is discharged for gas；
Incident reflecting mirror is fixed on one end of detection pipe, and offers on the mirror surface of incident reflecting mirror and send out for light emitting devices
The light penetrated injects the indoor entrance aperture to carry out multiple reflections of detection；Outgoing reflecting mirror is set to the other end of detection pipe, warp
The light that entrance aperture is injected carries out multiple reflections on two relative speculars of incident reflecting mirror and outgoing reflecting mirror, and is emitted reflection
It is opened up on the mirror surface of mirror for the beam projecting after multiple reflections by the received light passing window of optical detection device.
Further, entrance aperture deviates the axle center setting of incident reflecting mirror, and position of the light passing window on outgoing reflecting mirror is protected
At least one emergent light spot of light after card multiple reflections passes through.
Further, outgoing reflecting mirror is circumferentially adjusted by rotation in detection pipe.
Further, the light after the length covering multiple reflections of light passing windowsill outgoing reflecting mirror radial direction is along outgoing reflecting mirror
The width of radial distributing edge, light passing windowsill outgoing reflecting mirror circumferential direction at least guarantees that an emergent light spot passes through.
Further, light passing window be square, be round, diamond shape or irregular shape.
Further, detection pipe is cylindrical, and air inlet is located on the side wall of detection pipe one end, and gas outlet is located at detection pipe
On the side wall of the other end.
Further, it is equipped between incident reflecting mirror and detection pipe and/or between outgoing reflecting mirror and detection pipe for solid
Sealing element that is fixed and being tightly connected.
Further, detection pipe is externally provided with the light emitting devices being oppositely arranged with entrance aperture, is oppositely arranged with perforation hole
Optical detection device.
Further, light emitting devices uses infrared light emission device or laser emitter, and will go out through optical lens
The light penetrated imports sensing chamber through entrance aperture.
Further, optical detection device includes optical receiver module and the detection module for carrying out optical detection analysis, light
Receiving module is used to emergent light being transferred to detection module to test and analyze.
The invention has the advantages that：
The present invention is based on the sample detection means of Herriott multiple reflecting pool, by dividing in detection pipe along axial both ends
Not An Zhuan incident reflecting mirror, outgoing reflecting mirror, and entrance aperture, light passing window are separately positioned on incident reflecting mirror, on outgoing reflecting mirror,
Light through entrance aperture incidence carries out multiple reflections in indoor two relative speculars through incident reflecting mirror and outgoing reflecting mirror of detection,
It is emitted again through light passing window to be received by optical detection device, structure is simple, installation is convenient and manufacturing cost is low, and light path is adjustable, easy
In realizing and being not necessarily to individually add deviator, the mirror surface progress optical path for taking full advantage of incident reflecting mirror and outgoing reflecting mirror is anti-
It penetrates, and since entrance aperture, light passing window are located at the both ends of detection pipe axial direction, convenient for the peace of light emitting devices and optical detection device
Dress.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of sample detection means of the preferred embodiment of the present invention based on Herriott multiple reflecting pool
Figure；
Fig. 2 is the structural schematic diagram of preferred embodiment of the present invention incidence reflecting mirror；
Fig. 3 is the structural schematic diagram of preferred embodiment of the present invention outgoing reflecting mirror；
Fig. 4 is distribution signal of the flare of preferred embodiment of the present invention multiple reflections on the mirror surface of incident reflecting mirror
Figure；
Fig. 5 is mirror surface of the flare in the outgoing reflecting mirror without light passing window of preferred embodiment of the present invention multiple reflections
On distribution schematic diagram；
Fig. 6 is flare the showing through the light passing window outgoing on outgoing reflecting mirror of preferred embodiment of the present invention multiple reflections
It is intended to.
Description of symbols：
10, detection pipe；11, air inlet；12, gas outlet；
20, incident reflecting mirror；21, entrance aperture；
30, it is emitted reflecting mirror；31, light passing window.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It is not easy to adjust for the existing pond Herriott, it has not been convenient between laser and the installation and eyeglass of detector
Position accuracy demand is high or the pond Herriott need to individually add the order of reflection of deviator influence light and structure is complicated, installation
And light path inconvenience is adjusted, problem at high cost, the present embodiment provides a kind of novel samples based on Herriott multiple reflecting pool
Product detection device.Referring to Fig.1, sample detection means of the present embodiment based on Herriott multiple reflecting pool, including：Detection pipe
10, detection pipe 10 installs incident reflecting mirror 20, outgoing reflecting mirror 30, and the inner cavity conduct of detection pipe 10 along axial both ends respectively
Sensing chamber；Detection pipe 10 is equipped with the air inlet 11 being connected to sensing chamber and gas outlet 12, and air inlet 11 is for being passed through to test sample
Product gas, gas outlet 12 are discharged for gas；Incident reflecting mirror 20 is fixed on one end of detection pipe 10, and the mirror of incident reflecting mirror 20
The light offered on face for light emitting devices transmitting injects the indoor entrance aperture 21 to carry out multiple reflections of detection；Outgoing reflection
Mirror 30 is set to the other end of detection pipe 10, and the light injected through entrance aperture 21 is in incident reflecting mirror 20 and outgoing reflecting mirror 30
Carry out multiple reflections on two relative speculars, and be emitted on the mirror surface of reflecting mirror 30 open up for the beam projecting after multiple reflections with
By the received light passing window 31 of optical detection device.
The present embodiment by install incident reflecting mirror 20 respectively along axial both ends in detection pipe 10, being emitted reflecting mirror 30,
And entrance aperture 21, light passing window 31 are separately positioned on incident reflecting mirror 20, are emitted on reflecting mirror 30, through the incident light of entrance aperture 21
Multiple reflections are carried out in indoor two relative speculars through incident reflecting mirror 20 and outgoing reflecting mirror 30 of detection, then are gone out through light passing window 31
It penetrates to be received by optical detection device, structure is simple, installation is convenient and manufacturing cost is low, adjusts, takes full advantage of convenient for light path
The mirror surface of incident reflecting mirror and outgoing reflecting mirror carries out optical path reflection, and since entrance aperture, light passing window are located at detection pipe axis
To both ends, convenient for the installation of light emitting devices and optical detection device.
Fig. 2 shows the plan view of the present embodiment incidence reflecting mirror 20, Fig. 3 shows the present embodiment outgoing reflecting mirror 30
Plan view.In the present embodiment, incident reflecting mirror 20, outgoing reflecting mirror 30 are separately mounted to the both ends of detection pipe 10, and two eyeglasses are flat
It goes and concentric, relative distance meets multiple reflections condition, and incident reflecting mirror 20 is fixed on one end and the sealing of detection pipe 10, is not required to
It adjusts.Preferably, outgoing reflecting mirror 30 is circumferentially adjusted by rotation in detection pipe 10.Preferably, outgoing reflecting mirror 30 around
Detection pipe 10 can 360 ° of rotations adjust, through screw thread or fastening screw locking positioning and can be sealed after regulating.The present embodiment is logical
It crosses and sets circumferential adjustable structure, the adjustable position for being set to light passing window 31 on outgoing reflecting mirror 30 for outgoing reflecting mirror 30
It sets, and then realizes outgoing optical registration, can both play the role of guaranteeing emergent light outgoing, can also realize the adjustable of light path.
In the present embodiment, entrance aperture 21 deviates the axle center setting of incident reflecting mirror 20, and light passing window 31 is in outgoing reflecting mirror 30
On position guarantee that at least one emergent light spot of light after multiple reflections passes through.
Herriott multiple reflecting pool under normal circumstances, when positional relationship meets a certain specified conditions, from off-axis incident
The light of hole incidence be bound to after the reflection of certain number from the hole be emitted, i.e., in the prior art usually by entrance aperture and go out
Unthreaded hole is arranged ipsilateral.And the reflection light point of multiple reflections is usually distributed at ellipse (referring to Fig. 4, Fig. 5) on eyeglass, it is only special
Fixed incidence angle is at circular distribution.
The common pond Herriott, when following several situations occur：
1), when a certain range of deviation occurs for positional relationship between two eyeglasses, from the light of off-axis incident hole incidence, warp
The off-axis incident hole can be deviateed after multiple reflections and can not be projected；
2), when variation of ambient temperature causes optical path to deviate, it equally will appear the case where light can not be emitted；
3), it is certain in special circumstances, when light path needs to adjust, the light path of Herriott multiple reflecting pool is substantially
It is changeless to accomplish to adjust.
And since ipsilateral installation laser and detector due to angle very little between incident light and emergent ray work as laser
The problem of device and detector size are larger, and when spatial position is limited, can cause installation can not be solved or be solved
It is complex.
The present invention is directed to above several situations, by being provided with light passing window 31 in outgoing reflecting mirror 30, after making multiple reflections
Light is not emitted from the entrance aperture 21 of incident reflecting mirror 20, and is directly intercepted and be emitted on light passing window 31.Due to anti-on reflecting mirror
The usual ovalisation distribution of exit point, therefore the light passing window 31 is in the case where selecting a suitable width, it is ensured that only one light
Spot is fallen on the window, and light passing window design is at a certain length, it is ensured that no matter the elliptical shape that flare surrounds such as
What, can guarantee have a hot spot to fall on the window.Referring to Fig. 6, i.e., light passing window 31 is along the radial length of outgoing reflecting mirror 30
Light after covering multiple reflections is along the radial distributing edge of outgoing reflecting mirror 30, and light passing window 31 is along 30 circumferential direction of outgoing reflecting mirror
Width at least guarantees that an emergent light spot passes through.
Light can not caused by the present embodiment has well solved the above-mentioned positional relationship installed by eyeglass, variation of ambient temperature
It projects, laser and detector install the problem of limited, Herriott multiple reflecting pool light path fixation can not be adjusted.So that high-precision
The Herriott multiple reflecting pool that degree requires can more be easy and manufacture at low cost.
Preferably, the present embodiment light passing window 31 be square, the rule such as circle, diamond shape or irregular shape.That is light passing window 31
Shape do not limit, only need to meet at least one emergent light spot of the light after multiple reflections and pass through.Preferably, light passing window 31
Light after the length covering multiple reflections radial along outgoing reflecting mirror 30 is along the radial distributing edge of outgoing reflecting mirror 30, i.e. institute
Have emergent light spot radially on can pass through；Light passing window 31 at least guarantees an emergent light along the circumferential width of outgoing reflecting mirror 30
Spot passes through, that is, the emergent light spot for being not excluded for will lead to two or more is fallen on.
Preferably, the present embodiment detection pipe 10 is cylindrical, and air inlet 11 is located on the side wall of 10 one end of detection pipe, outlet
Mouth 12 is located on the side wall of 10 other end of detection pipe.Cylindric 10 structure of detection pipe, is easily installed and is emitted reflecting mirror 30
It is adjusted circumferentially, and the internal volume of sensing chamber is minimum, convenient for the fast exchange of under test gas.It is highly preferred that in order to enhance detection
Indoor air-tightness is equipped between incident reflecting mirror 20 and detection pipe 10 and/or between outgoing reflecting mirror 30 and detection pipe 10 and uses
In the sealing element of sealed connection.The present embodiment, sealing element are preferably O-ring seals.
In the present embodiment, detection pipe 10 is externally provided with the light emitting devices being oppositely arranged with entrance aperture 21 and perforation hole phase
To the optical detection device of setting.Wherein, light emitting devices uses infrared light emission device or laser emitter, and through optical lens
The light of outgoing is imported sensing chamber through entrance aperture 21 by mirror；Optical detection device includes optical receiver module and for carrying out optical detection
The detection module of analysis, optical receiver module are used to emergent light being transferred to detection module to test and analyze.
From above description it is known that the present embodiment by installing incidence instead along axial both ends in detection pipe 10 respectively
Mirror 20, outgoing reflecting mirror 30 are penetrated, and entrance aperture 21, light passing window 31 are separately positioned on incident reflecting mirror 20, are emitted on reflecting mirror 30,
Light through 21 incidence of entrance aperture is more in the indoor two relative speculars progress through incident reflecting mirror 20 and outgoing reflecting mirror 30 of detection
Secondary reflection, then be emitted through light passing window 31 to be received by optical detection device, so that machining accuracy and installation requirement drop to reflection tank
Low, optical path adjusting is more easy and convenient；And reduce the influence of the offset of the optical path due to caused by the environmental factors such as temperature, lead to light
The case where can not projecting or cannot projecting completely, reduces the optical path as caused by trueness error in installation and process and deviates
Influence so that the case where light can not be projected or cannot be projected completely.Furthermore it is possible to light path is adjusted according to demand, it is non-
It is often convenient.In addition, incident light and reflected light directional spreding are convenient to the installation of laser and detector in sample cell two sides.This hair
Bright detection device compact overall structure, design is simple, and low in cost, and light path is adjustable, is easy to implement, to meet high-precision
It is required that Herriott multiple reflecting pool convenience, the simple and demand that manufactures at low cost, there is wide applicability.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of sample detection means based on Herriott multiple reflecting pool, which is characterized in that including：Detection pipe (10), institute
It states detection pipe (10) and incident reflecting mirror (20), outgoing reflecting mirror (30), and the detection pipe is installed respectively along axial both ends
(10) inner cavity is as sensing chamber；
The detection pipe (10) is equipped with the air inlet (11) being connected to the sensing chamber and gas outlet (12), the air inlet
(11) for being passed through sample to be tested gas, the gas outlet (12) is discharged for gas；
The incidence reflecting mirror (20) is fixed on one end of the detection pipe (10), and on the mirror surface of the incident reflecting mirror (20)
The light offered for light emitting devices transmitting injects the indoor entrance aperture (21) to carry out multiple reflections of the detection；It is described go out
The other end that reflecting mirror (30) is set to the detection pipe (10) is penetrated, the light injected through the entrance aperture (21) is in the incidence
Multiple reflections, and the outgoing reflecting mirror (30) are carried out on reflecting mirror (20) and two relative speculars of outgoing reflecting mirror (30)
Mirror surface on open up for the beam projecting after the multiple reflections by the received light passing window (31) of optical detection device；
The entrance aperture (21) deviates the axle center setting of the incident reflecting mirror (20), and the light passing window (31) is anti-along the outgoing
The length for penetrating mirror (30) radial direction covers the light after the multiple reflections along the distributing edge of described outgoing reflecting mirror (30) radial direction,
The light passing window (31) at least guarantees that an emergent light spot passes through along the width of described outgoing reflecting mirror (30) circumferential direction；
By installing incident reflecting mirror (20), outgoing reflecting mirror (30) respectively along axial both ends in detection pipe (10), and it is incident
Hole (21), light passing window (31) are separately positioned on incident reflecting mirror (20), are emitted on reflecting mirror (30), incident through entrance aperture (21)
Light carries out multiple reflections in indoor two relative speculars through incident reflecting mirror (20) and outgoing reflecting mirror (30) of detection, then through logical
Optical window (31) is emitted to be received by optical detection device, so that the machining accuracy and installation requirement to reflection tank reduce, optical path adjusting
It is more easy and convenient；And reduce the influence of the offset of the optical path due to caused by environmental factor, cause light that can not project or cannot be complete
Full the case where projecting, reduce as install and process in the influence that deviates of optical path caused by trueness error so that light without
The case where method is projected or cannot be projected completely.
2. the sample detection means according to claim 1 based on Herriott multiple reflecting pool, which is characterized in that
The outgoing reflecting mirror (30) is circumferentially adjusted by rotation on the detection pipe (10).
3. the sample detection means according to claim 2 based on Herriott multiple reflecting pool, which is characterized in that
The light passing window (31) at least guarantees that an emergent light spot passes through along the width of described outgoing reflecting mirror (30) circumferential direction.
4. the sample detection means according to claim 3 based on Herriott multiple reflecting pool, which is characterized in that
The light passing window (31) is square, round, diamond shape or irregular shape.
5. the sample detection means according to any one of claims 1 to 4 based on Herriott multiple reflecting pool, feature exist
In,
The detection pipe (10) is cylindrical, and the air inlet (11) is located on the side wall of the detection pipe (10) one end, described
Gas outlet (12) is located on the side wall of the detection pipe (10) other end.
6. the sample detection means according to claim 5 based on Herriott multiple reflecting pool, which is characterized in that
Between the incidence reflecting mirror (20) and the detection pipe (10) and/or the outgoing reflecting mirror (30) and the detection pipe
(10) it is equipped between for sealing element that is fixed and being tightly connected.
7. the sample detection means according to claim 5 based on Herriott multiple reflecting pool, which is characterized in that
The light emitting devices and the perforation hole phase that be externally provided with and the entrance aperture (21) of the detection pipe (10) are oppositely arranged
To the optical detection device of setting.
8. the sample detection means according to claim 7 based on Herriott multiple reflecting pool, which is characterized in that
The light emitting devices uses infrared light emission device or laser emitter, and passes through the light of outgoing through optical lens
The entrance aperture (21) imports the sensing chamber.
9. the sample detection means according to claim 7 based on Herriott multiple reflecting pool, which is characterized in that
The optical detection device includes optical receiver module and the detection module for carrying out optical detection analysis, the light-receiving mould
Block is used to emergent light being transferred to the detection module to test and analyze.
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| CN201511023636.9A CN105466855B (en) | 2015-12-31 | 2015-12-31 | Sample detection means based on Herriott multiple reflecting pool |
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| CN201511023636.9A CN105466855B (en) | 2015-12-31 | 2015-12-31 | Sample detection means based on Herriott multiple reflecting pool |
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| CN105758803A (en) * | 2016-04-28 | 2016-07-13 | 中钢集团武汉安全环保研究院有限公司 | Laser gas detection platform with multiple-reflection long-optical-path high-temperature sample chamber |
| CN108007864A (en) * | 2017-11-08 | 2018-05-08 | 北京航天控制仪器研究所 | A kind of double window mirror optics cavity |
| CN110146471A (en) * | 2019-03-13 | 2019-08-20 | 常州龙新激光科技有限公司 | The design in the multiple round-trip reflected sample pond of small size |
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| CN104155241A (en) * | 2014-07-02 | 2014-11-19 | 合肥工业大学 | Long-path optical absorption cell adjustable in optical path |
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| US7192782B2 (en) * | 2002-01-11 | 2007-03-20 | Ekips Technologies, Inc. | Method and apparatus for determining marker gas concentration in exhaled breath using an internal calibrating gas |
| US8018981B2 (en) * | 2006-04-12 | 2011-09-13 | Li-Cor, Inc. | Multi-pass optical cell with actuator for actuating a reflective surface |
| CN201732052U (en) * | 2010-06-30 | 2011-02-02 | 中国科学院安徽光学精密机械研究所 | Optical-path-adjustable open-type multiple reflecting pool for gas content online monitoring |
| CN101950115B (en) * | 2010-09-01 | 2012-05-23 | 天津大学 | Multi-way pulse compressor and using method thereof |
| CN103884677B (en) * | 2012-12-19 | 2017-05-03 | 北京大方科技有限责任公司 | Gas analyzer sample gas chamber apparatus with characteristic of easy optical path adjustment |
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| CN104155241A (en) * | 2014-07-02 | 2014-11-19 | 合肥工业大学 | Long-path optical absorption cell adjustable in optical path |
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