CN106483071A - A kind of gas detector and its absorption cell - Google Patents
A kind of gas detector and its absorption cell Download PDFInfo
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- CN106483071A CN106483071A CN201611261215.4A CN201611261215A CN106483071A CN 106483071 A CN106483071 A CN 106483071A CN 201611261215 A CN201611261215 A CN 201611261215A CN 106483071 A CN106483071 A CN 106483071A
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- light
- absorption cell
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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
- G01N21/03—Cuvette constructions
-
- 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
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The present invention relates to a kind of gas detector and its absorption cell, absorption cell is plano-concave optical resonator cavity, the near-end pip being formed, far-end pip on plane mirror, concave mirror are all circumferentially distributed its light path around the optical axis of resonator cavity respectively, and the light entrance structures thereof of incident illumination may be contained within plane mirror with the light emitting structures of emergent light, light entrance structures thereof and the position of light emitting structures can be arrange on the coincident reflection point that reflection order is different but position overlaps or near-end pip in close to each other two point.It is arranged such and the spacing between the light entrance structures thereof of incident illumination and the light emitting structures of emergent light just can be enable as little as possible.So use this absorption cell, detector becoming smaller in size in radial directions, save space can not only be made, realize miniaturized structure, be easy to carry；And the light path of light can be made to become longer in the optical resonator of small volume, thus beneficial to follow-up gas detecting work.
Description
Technical field
The present invention relates to gas detection technology field, more particularly to a kind of gas detector and its absorption cell.
Background technology
Existing gas concentration detection apparatus, such as " one kind is just for the Chinese patent literature for CN 205593914 U for the notification number
Take formula dusty gass concentration detection apparatus ", including absorption cell and be arranged on the optical transmitting set of absorption cell homonymy and optical receiver with
And the detection means being connected with optical receiver, wherein absorption cell includes the absorption cell cavity entering under test gas, absorbs cell cavity
It is provided with close to sources terminal reflector, the distance light source reflecting mirror of left and right distribution, close to sources terminal reflector, distance light source reflecting mirror in vivo
Effectively form an optical resonator, the optical axis of this optical resonator is the horizontal axis that left and right extends, specifically this is existing
There is the optical resonator in technology to be concave-concave optical resonator, namely close to sources terminal reflector is a concave mirror, distance light source
Reflecting mirror is two concave mirrors, it is also possible to distance light source reflecting mirror is set to a concave surface certainly in other prior arts
Mirror.
The absorption cell that concave-concave optical resonator of the prior art is constituted when using, the light beam that light source sends directly from
The entrance of the radial outside of close to sources terminal reflector enters absorption cell, and light beam projects distance light source reflecting mirror first, then successively
Reflected through distance light source reflecting mirror, close to sources terminal reflector, distance light source reflecting mirror ..., produce optical resonance, pass through
This optical resonance is so that the distance of light can become very long in the optical resonator of small volume, thus being beneficial to follow-up
Gas detecting work.
But, due to the light entrance structures thereof (light inlet) of above-mentioned incident illumination of the prior art and the light emitting structures of emergent light
(light-emitting window) is distributed across the opposite sides radially of close to sources terminal reflector, and this results in the light entrance structures thereof of incident illumination
Spacing between the light emitting structures (light-emitting window) of (light inlet) and emergent light is excessive, and then makes optical transmitting set and optical receiver
Spacing setting excessive, lead to gas detection equipment in radial directions oversized so that detecting devices structure body
Long-pending big, weight weight, complex structure it is impossible to use (high-temperature vibrating) in extreme circumstances, the problems such as portable.
Content of the invention
It is an object of the invention to provide the light emitting structures of a kind of light entrance structures thereof that can reduce incident illumination and emergent light it
Between the gas detector of spacing absorption cell, the gas detector using this absorption cell is provided simultaneously, and enables in high temperature
In site measurement in flue gas.
For achieving the above object, the present invention adopts the following technical scheme that：A kind of absorption cell of gas detector, including absorption
The close to sources terminal reflector of left and right setting, distance light source reflecting mirror in cell cavity body and absorption cell cavity, absorption cell also includes incidence
The light entrance structures thereof of light, the light emitting structures of emergent light, the close to sources terminal reflector in absorption cell cavity, distance light source reflecting mirror structure
Become the optical resonator that optical axis is the horizontal axis that left and right extends, the light path of optical resonator respectively close to sources terminal reflector,
Near-end pip, far-end pip are formed on distance light source reflecting mirror；Described close to sources terminal reflector, distance light source reflecting mirror divide
Not Wei plane mirror and concave mirror, described plane mirror and concave mirror constitute flat-recessed optical resonator, described
Near-end pip, far-end pip are all circumferentially distributed around optical axis, and described light entrance structures thereof and light emitting structures may be contained within plane
On reflecting mirror, light entrance structures thereof and the position of light emitting structures be in reflection order in near-end pip different but one of position coincidence
In coincidence point or be on close to each other two point in near-end pip.
Described absorption cell containment portion is provided with the dust-proof air ventilation sintering metal guard of parcel absorption cell cavity.
Described plane mirror is fixed together by high temperature alloy support bar and concave mirror.
A kind of gas detecting of the present invention visits the technical scheme of device, including absorption cell and the light that is arranged on the left of absorption cell is sent out
Emitter, optical receiver, described absorption cell include the close to sources terminal reflector of left and right setting in absorption cell cavity and absorption cell cavity,
Distance light source reflecting mirror, absorption cell also includes the light emitting structures of the light entrance structures thereof of incident illumination, emergent light, in absorption cell cavity
Close to sources terminal reflector, distance light source reflecting mirror constitute the optical resonator that optical axis is the horizontal axis that left and right extends, and optics is humorous
Shake chamber light path respectively on close to sources terminal reflector, distance light source reflecting mirror formed near-end pip, far-end pip；Described
Close to sources terminal reflector, distance light source reflecting mirror be respectively plane mirror and concave mirror, described plane mirror with recessed
Face reflecting mirror constitutes flat-recessed optical resonator, and described near-end pip, far-end pip are all circumferentially distributed around optical axis, institute
State light entrance structures thereof and may be contained within plane mirror with light emitting structures, the position of light entrance structures thereof and light emitting structures is in near-end reflection
Reflect order difference in point but in a coincidence point of position coincidence or be in close to each other two in near-end pip
Point on.
On gas detector, the left side in absorption cell is provided with the light path chamber passing through for light, and described optical transmitting set and light connect
Receive device and be arranged on light path chamber left end.
Described absorption cell containment portion is provided with the dust-proof air ventilation sintering metal guard of parcel absorption cell cavity.
Described plane mirror is fixed together by high temperature alloy support bar and concave mirror.
Also include for the eyeglass of turning back changing beam direction so that light beam is gathered to optical axis direction；Described eyeglass of turning back
Located at the left end of absorption cell or the right-hand member located at light path chamber or every between absorption cell cavity and light path chamber, so that
Facial expression line by while hermetic barrier is carried out to absorption cell cavity and light path chamber.
Described eyeglass of turning back is prism of turning back.
The absorption cell of the present invention is flat-recessed optical resonator, its light path shape on plane mirror, concave mirror respectively
The near-end pip becoming, far-end pip are all circumferentially distributed around the optical axis of flat-recessed optical resonator, and the entering of incident illumination
Photo structure may be contained within plane mirror with the light emitting structures of emergent light, specifically, the position of light entrance structures thereof and light emitting structures
Can be two kinds of forms, the first is to arrange on the coincident reflection point that reflection order is different but position overlaps, another kind of
Then select close to each other two setting in near-end pip.It is arranged such light entrance structures thereof and the outgoing that just can make incident illumination
Spacing between the light emitting structures of light can be as little as possible.So using this, there is the absorption cell of flat-recessed optical resonator, a side
Face, makes detector becoming smaller in size in radial directions, saves the space taking, realizes the miniaturization of structure, just
In carrying.On the other hand, optical resonance can be produced so that the distance of light can become in the optical resonator of small volume
Obtain longer, thus beneficial to follow-up gas detecting work.
Further, the prism of turning back of the gas detector setting in the present invention, can be used for changing beam direction, makes light beam
Gather to optical axis so that the spacing between distantly located optical transmitting set and optical receiver is little as far as possible, save radial direction side
To space.Meanwhile, turn back prism facial expression line by while hermetic barrier is carried out to absorption cell cavity and light path chamber so that
When absorption cell is in hot environment, due to being in the absorption cell of high temperature and light transmitting and light receiver separates so that light
Transmitting and light receiving part will not affected by temperature it is ensured that the accuracy of measurement data.
Brief description
Fig. 1 is the structure chart of the gas detector of the present invention；
Fig. 2 is the optical circuit path schematic diagram of the gas detector of the present invention；
Fig. 3 is the left view of Fig. 2；
Fig. 4 be turn back prism optical circuit path schematic diagram side view；
Fig. 5 be turn back prism optical circuit path schematic diagram top view.
Specific embodiment
Below in conjunction with the accompanying drawings embodiments of the present invention are described further.
Gas detector embodiment
Fig. 1 is a kind of basic structure schematic diagram of gas detector of the present invention, and it includes absorption cell and is arranged at gas
On detector, the left side in absorption cell is provided with the optical transmitting set 7 of the light path chamber left end passing through for light, optical receiver 8, and light
The outer wrap in road chamber has thin-walled supporting steel pipe 9.
Gas detector in the present embodiment also includes being arranged on the prism 5 of turning back of the light path chamber right-hand member passing through for light.
The absorption cell of the gas detector in the present embodiment includes left and right setting in absorption cell cavity and absorption cell cavity
Close to sources terminal reflector, distance light source reflecting mirror, the light entrance structures thereof (light inlet) of incident illumination, the light emitting structures of emergent light (go out light
Mouthful), the close to sources terminal reflector in absorption cell cavity, distance light source reflecting mirror constitute the horizontal axis that optical axis is that left and right extends
Optical resonator.Wherein, close to sources terminal reflector, distance light source reflecting mirror are respectively plane mirror 1 and concave mirror
2, two reflecting mirrors are fixed together by high temperature alloy support bar 3, and constitute flat-recessed optical resonator；Flat-recessed optical resonator
Light path respectively on hither plane reflecting mirror 1, distance light source reflecting mirror 2 formed near-end pip D point, far-end pip E point,
As shown in Fig. 2 the optical axis that the track of near-end pip D point is around optical resonator is in circular being distributed, far-end pip E point
Track be also around optical resonator optical axis be in circular be distributed.
The light entrance structures thereof (light inlet) of the incident illumination in the present embodiment is respectively provided with the light emitting structures (light-emitting window) of emergent light
On plane mirror 1, and be in can in near-end pip D for the position of light entrance structures thereof (light inlet) and light emitting structures (light-emitting window)
To be in a coincidence point 6 of reflection order difference but position coincidence, as shown in figs. 1 and 3.
Wherein, Fig. 3 is the beam path left view of Fig. 2, and the beam path between two reflecting mirrors is：1-1(in)→2-1→
1-2 → 2-2 → 1-3 → 2-3 → 1-4 → 2-4 → 1-5 →... ... → 2-17 → 1-18 → 2-18 → 1-19 → 1-20 (out), its
Light inlet is 1-1 (in) is the pip coinciding with light-emitting window for 1-20 (out), and the circular path of near-end pip D point
The circular path comparing far-end pip E point is little.Meanwhile, light beam outgoing after 40 secondary reflections, in the volume of about 300ml
Achieve the absorption of more than ten meters of long light path, that is, the present invention, in the case of taking minimum volume, forms complete long light path application
Service TDLAS in optical delay line.
As other embodiment, the light entrance structures thereof (light inlet) of the plane mirror 1 in the present invention (is gone out with light emitting structures
Optical port) can not also be on same position, as long as on close to each other two point being in near-end pip, such as light beam
Can be incident from 1-1 (in), from 1-16 (out) outgoing, technical scheme also can be met.
The light entrance structures thereof (light inlet) of the plane mirror 1 in above-mentioned and the setting of light emitting structures (light-emitting window) can make into
The spacing penetrated between the light entrance structures thereof of light and the light emitting structures of emergent light can be as little as possible.So in use this have flat-recessed
The absorption cell of optical resonator, on the one hand, make detector becoming smaller in size in radial directions, saves the sky taking
Between, realize the miniaturization of structure, be easy to carry.On the other hand, optical resonance can be produced so that the distance of light can be in body
Amassing in less optical resonator becomes longer, thus beneficial to follow-up gas detecting work.
Meanwhile, the absorption cell containment portion in the present embodiment is also enclosed with sintering metal guard 4, can not only make gas to be measured
Body passes freely through, and may also reach up dust-proof effect.
As shown in Fig. 2 the light beam that sends in exit positions A point of optical transmitting set 7 is through the C point position on prism 5 leading to of turning back
The light entrance structures thereof (light inlet) 6 crossing plane mirror 1 is incident to flat-recessed optical resonator, carries out in flat-recessed optical resonance intracavity
After multiple reflections, carry out after light beam conditioning through prism C point of turning back after light emitting structures (light-emitting window) 6 outgoing through plane mirror 1,
Received by optical receiver 8 receiving light beam position B point, you can realize the detection work of gas.Light beam in the present embodiment is flat-recessed
Can turn back back and forth in optical resonator tens of to hundreds of times, its light beam track lenth is up to tens of rice, such long light path
Optical circuit path can make light beam fully by the GAS ABSORPTION of surrounding, it is possible to increase the Monitoring lower-cut of under test gas；Simultaneously for weak
The gas absorbing is (as NH3,CO,O2Deng), Monitoring lower-cut can be to ppb magnitude.
Furthermore, the prism 5 of turning back in the present embodiment is mainly used in carrying out light beam conditioning to the light beam that optical transmitting set 7 sends,
Incide in flat-recessed optical resonator that two reflecting mirrors are constituted through plane mirror 1 at an appropriate angle, after multiple reflections；Make
The light beam of outgoing accurately can pass through plane mirror, then is received by optical receiver 8 after prism 5 process of turning back.Arrange
Prism of turning back be mainly used for changing beam direction so that between distantly located optical transmitting set 7 and optical receiver 8
Away from little as far as possible, save the space of radial direction.
As other embodiment, the prism 5 of turning back of the present invention can also be arranged on a left side for the absorption cell cavity of absorption cell
Hold any suitable location naturally it is also possible to be arranged between light transmitting and light receiving part right-hand member and absorption cell part left end.
When detecting the gas of hot environment, prism 5 of turning back can will be in hot environment while facial expression line passes through
Absorption cell cavity and light path chamber carry out hermetic barrier, such optical transmitting set and optical receiver would not be affected by temperature,
Ensure that the accuracy of measurement data.
As shown in Figures 4 and 5, the prism of turning back in the present embodiment is pentaprism, and Fig. 4 is the side view of pentaprism, and Fig. 5 is five
The top view of prism.Certainly, as other embodiment, prism of turning back can also choose other polygon prisms, as long as meeting to light
The conditioning of bundle.Meanwhile, in order to reduce the noise of impact light beam, by 5-1 plating in thang-kng surface before and after the prism 5 of turning back of setting
Anti-reflection film.As other embodiment, the prism of turning back of the present invention is not limited to prism or other can make light
The eyeglass gathered to optical axis, as long as meet needs.
Optical transmitting set 7 in the present embodiment can be LASER Light Source, as long as the light beam wavelength that light source sends meets gas to be measured
The scope that body absorbs；Optical receiver 8 can be In GaAs detector or other detectors, as long as meeting to light
The detection of bundle.
As other embodiment, the optical transmitting set 7 in the present invention need not be arranged in the left side of absorption cell with optical receiver 8
The light path chamber passing through for light, it can also be set directly at the left side of absorption cell, only need to meet gas detecting working properly enter
Row.
The gas detector of the present embodiment is primarily adapted for use in the high-temperature flue gas region of closing；In use, as Fig. 1 institute
Show, on hot wall 11 left side, the light path chamber being enclosed with longer thin-walled supporting steel pipe makes optical transmitting set 7 and optical receiver 8 remote
From high-temperature region it is ensured that its normal work；It is 450 degrees Celsius of high-temperature area on the right of hot wall, and absorption cell is by dust-proof
Gas sintering metal guard is wrapped up, you can to stand 400 celsius temperatures, keep stable optical-mechanical characteristic.Its main work
Make principle as follows：The laser beam sending from optical transmitting set 7 is nursed one's health through the light beam of prism 5 of turning back, and passes through at an appropriate angle
In flat-recessed optical resonator that incident two reflecting mirrors of the light entrance structures thereof of plane mirror 1 are constituted, in flat-recessed optical resonator
Laser beam turn back back and forth tens of to hundreds of time, then accurately from the light emitting structures of plane mirror (light emitting structures with enter light
Structure is on same position) after outgoing, reach In GaAs detector 8 after processing through prism 5 of turning back, that is, according to whole in Fig. 1
Optical circuit path 10 is propagated.Optical receiver 8 by the absorption line to laser for the gas is drawn to the analysis of photosignal, according to
This extrapolates the concentration of tested gas, the detection of the region flue gas that reaches a high temperature.
Absorption cell embodiment
Absorption cell in the present embodiment is consistent with the absorption pool structure in gas detector, will not be described here.
The present invention, during optical structure design, has taken into full account the portability of whole instrument.By special light
Learn Machine Design, make the diameter control of sensor in 60mm, within 1m, weight is less than 7Kg to overall length.Can appropriate mix
Storage casing, be easy to single portable and clog-free can take all kinds of public transports.
Gas detector structure in the present invention is light firm, small volume and be easy to transport deployment.It is applied not only to high temperature
Monitoring, the calibration of on-line sensor；The combustion conditions that can be additionally used in large-scale combustors are adjusted.Most preferably it is used for high temperature and behaviour
Make the occasion of limited space.
Above in conjunction with accompanying drawing, invention has been described, but the invention is not limited in above-mentioned specific embodiment party
Formula, in the case of without departing from present inventive concept and scope of the claimed protection, for the other embodiment in the present invention, this
Skilled person is for the lens shape of the flat-recessed resonator cavity in absorption cell and the light such as size, cavity size and arrangement
Learn parameter, can by the related computing formula of the corresponding structure to optical axis, the number of times of reflection and two reflecting mirrors and parameter also
A lot of forms can be made, these are all within protection scope of the present invention.
Claims (9)
1. a kind of absorption cell of gas detector, the dipped beam source including left and right setting in absorption cell cavity and absorption cell cavity is anti-
Penetrate mirror, distance light source reflecting mirror, absorption cell also includes the light emitting structures of the light entrance structures thereof of incident illumination, emergent light, absorb cell cavity
Internal close to sources terminal reflector, distance light source reflecting mirror constitute the optical resonator that optical axis is the horizontal axis that left and right extends,
The light path of optical resonator forms near-end pip, far-end reflection respectively on close to sources terminal reflector, distance light source reflecting mirror
Point it is characterised in that：Described close to sources terminal reflector, distance light source reflecting mirror are respectively plane mirror and concave mirror,
Described plane mirror and concave mirror constitute flat-recessed optical resonator, described near-end pip, far-end pip all around
Optical axis is circumferentially distributed, and described light entrance structures thereof and light emitting structures may be contained within plane mirror, light entrance structures thereof and light emitting structures
Position be in near-end pip that reflection order is different but in a coincidence point that position overlaps or be in near-end pip
In close to each other two point on.
2. absorption cell according to claim 1 it is characterised in that：Described absorption cell containment portion is provided with parcel absorption cell
The dust-proof air ventilation sintering metal guard of cavity.
3. absorption cell according to claim 1 it is characterised in that：Described plane mirror pass through high temperature alloy support bar with
Concave mirror is fixed together.
4. a kind of gas detector, including absorption cell and be arranged at optical transmitting set on the left of absorption cell, optical receiver, described absorption
Pond includes the close to sources terminal reflector of left and right setting, distance light source reflecting mirror, absorption cell in absorption cell cavity and absorption cell cavity
Also include the light entrance structures thereof of incident illumination, the light emitting structures of emergent light, the close to sources terminal reflector in absorption cell cavity, distance light source
Terminal reflector constitutes the optical resonator that optical axis is the horizontal axis that left and right extends, and the light path of optical resonator is respectively in close to sources
On terminal reflector, distance light source reflecting mirror formed near-end pip, far-end pip it is characterised in that：Described dipped beam source is anti-
Penetrate mirror, distance light source reflecting mirror is respectively plane mirror and concave mirror, described plane mirror and concave mirror structure
Cheng Ping-recessed optical resonator, described near-end pip, far-end pip are all circumferentially distributed around optical axis, described light entrance structures thereof
May be contained within plane mirror with light emitting structures, the position of light entrance structures thereof and light emitting structures is in reflection time in near-end pip
Sequence is different but in a coincidence point of position coincidence or is on close to each other two point in near-end pip.
5. gas detector according to claim 4 it is characterised in that：On gas detector, the left side in absorption cell is arranged
There is the light path chamber passing through for light, described optical transmitting set and optical receiver are arranged on light path chamber left end.
6. gas detector according to claim 4 it is characterised in that：Described absorption cell containment portion is provided with parcel and inhales
The dust-proof air ventilation sintering metal guard of receives pond cavity.
7. gas detector according to claim 4 it is characterised in that：Described plane mirror is supported by high temperature alloy
Bar is fixed together with concave mirror.
8. gas detector according to claim 5 it is characterised in that：Also include the mirror of turning back for changing beam direction
Piece is so that light beam is gathered to optical axis direction；Described turn back eyeglass located at the left end of absorption cell or the right-hand member located at light path chamber,
Or every between absorption cell cavity and light path chamber, so as to absorption cell cavity and light path chamber while facial expression line passes through
Carry out hermetic barrier.
9. gas detector according to claim 8 it is characterised in that：Described eyeglass of turning back is prism of turning back.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611261215.4A CN106483071B (en) | 2016-12-30 | 2016-12-30 | Gas detector and absorption tank thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611261215.4A CN106483071B (en) | 2016-12-30 | 2016-12-30 | Gas detector and absorption tank thereof |
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| CN106483071B CN106483071B (en) | 2023-08-22 |
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Cited By (5)
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| CN109001154A (en) * | 2018-06-13 | 2018-12-14 | 贾良权 | The efficient measuring system of seed vitality based on laser absorption spectroscopy |
| CN110736713A (en) * | 2018-07-20 | 2020-01-31 | 西门子股份公司 | Gas analyzer and gas analyzing method |
| WO2020088210A1 (en) * | 2018-10-31 | 2020-05-07 | 上海禾赛光电科技有限公司 | Laser gas detection device |
| CN111896475A (en) * | 2020-07-29 | 2020-11-06 | 东北大学秦皇岛分校 | Light path range-extending type photoacoustic cell for photoacoustic spectrum trace gas detection |
| CN111948157A (en) * | 2020-07-31 | 2020-11-17 | 中国电子科技集团公司第四十一研究所 | Long-optical-path tunable absorption cell and emergent light beam collection method thereof |
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