CN110596005A - Novel annular flat concave mirror optical multi-pass absorption pool - Google Patents
Novel annular flat concave mirror optical multi-pass absorption pool Download PDFInfo
- Publication number
- CN110596005A CN110596005A CN201910911908.0A CN201910911908A CN110596005A CN 110596005 A CN110596005 A CN 110596005A CN 201910911908 A CN201910911908 A CN 201910911908A CN 110596005 A CN110596005 A CN 110596005A
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- Prior art keywords
- concave mirror
- flat concave
- pass
- absorption cell
- absorption
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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
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
-
- 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
- G01N21/031—Multipass arrangements
Abstract
The invention relates to the field of optical detection, in particular to a novel annular plano-concave mirror optical multi-pass absorption cell, which comprises an annular optical multi-pass cell absorption cell body with an air inlet hole and an air outlet hole, and a plano-concave mirror which is arranged in the multi-pass absorption cell body and is plated with a high reflection film. In particular, the first flat concave mirror, the second flat concave mirror and the third flat concave mirror are respectively connected with the three ends of the multi-pass tank absorption tank body in a sealing way to form a light closed loop. The first plane reflector is provided with an incident light hole, and the second plane reflector is provided with an emergent light hole. The annular optical multi-pass cell has a compact structure, greatly improves the optical path and improves the detection sensitivity of the absorption cell. Can be widely applied to the detection of atmospheric trace gas.
Description
Technical Field
The invention relates to the field of optical detection, in particular to a novel annular planoconvex mirror optical multi-pass absorption cell.
Background
The optical multi-pass absorption cell is used as a high-sensitivity optical instrument and widely applied to laser optics and high-resolution laser absorption spectroscopy, and light rays are reflected for multiple times in a compact volume of the multi-pass cell to form stable light field distribution to realize a long optical path, so that the detection sensitivity and the detection limit are improved. At present, a common optical multipass cell, such as a Herriot multipass absorption cell using a spherical mirror and a method thereof disclosed in european patent application EP 2375237AI, 10.12.2011. The multi-pass absorption cell mentioned in the patent application document of the invention consists of an absorption cell body with an air inlet and an air outlet and flat concave mirrors positioned at two ends of the absorption cell body, wherein the concave surfaces of the two flat concave mirrors are oppositely arranged, the concave surfaces of the flat concave mirrors are plated with reflecting films, and the edges of the flat concave mirrors are provided with light holes; during detection, different reflection times of light are realized by adjusting the distance and the inclination angle of the two flat concave mirrors, and different absorption optical paths are obtained. Although the optical multi-pass absorption cell can realize long absorption optical path, the optical multi-pass absorption cell has the following defects: when the cavity length of the absorption cell is fixed, the effective optical path tends to be fixed due to the interference effect among laser spots, and in order to obtain a better optical path, the cavity length or the size of the reflector can be increased, but the volume, the weight and the cost of the optical multi-pass cell are greatly increased. These adverse factors limit the application of the optical multipass cell, and therefore, a new annular plano-concave mirror optical multipass absorption cell has been proposed to address the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a novel annular planoconvex mirror optical multi-pass absorption cell.
The technical scheme adopted by the invention for solving the technical problems is as follows: a novel annular flat concave mirror optical multi-pass absorption tank comprises a multi-pass absorption tank body, wherein a first flat concave mirror, a second flat concave mirror and a third flat concave mirror are mounted on the multi-pass absorption tank body, and the first flat concave mirror, the second flat concave mirror and the third flat concave mirror form a light annular closed loop; the body of the multi-way absorption tank is provided with an air inlet and an air outlet; the first flat concave mirror is provided with an incident light hole, and the second flat concave mirror is provided with an emergent light hole.
Specifically, the included angles between the first flat concave mirror, the second flat concave mirror and the third flat concave mirror and between the flat concave mirror lenses are all 60 degrees.
Specifically, the laser beam is emitted to the incident light hole, enters the absorption cell body through the incident light hole of the first flat concave mirror, is reflected by the second flat concave mirror, is emitted to the third flat concave mirror and is reflected to the first flat concave mirror again, and the laser beam is reflected for multiple times in the folding cavity to form stable light field distribution and is finally emitted from the emergent hole.
The invention has the beneficial effects that:
(1) compared with the traditional multi-pass cell, the optical multi-pass cell has the advantages that light rays are reflected back and forth for multiple times in the cell body of the absorption cell to form a closed loop, the optical path of the annular optical multi-pass cell is improved by about 1.5 times compared with the optical multi-pass cell with two planoconcave mirrors with the same cavity length, and the detection sensitivity is improved.
(2) Compared with the traditional multi-pass cell, the annular planoconcave surface mirror has small noise in the mode of the annular multi-pass cell cavity due to the asymmetry of the mode of the optical multi-pass cell cavity of the annular planoconcave surface mirror, so that the detection sensitivity is favorably improved.
(3) Compared with the traditional multi-pass cell, the thermal lens effect of the multi-element multi-pass cell greatly improves the thermal stability of the annular multi-pass cell cavity and is beneficial to expanding the application range of the optical multi-pass cell.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a preferred embodiment of a novel optical multipass absorption cell of an annular planoconvex mirror according to the present invention;
FIG. 2 is a schematic view of the overall structure shown in FIG. 1;
FIG. 3 is a bottom plan view of the overall structure shown in FIG. 1;
FIG. 4 is a schematic diagram of the distribution of light spots of the first flat concave mirror according to the present invention;
FIG. 5 is a schematic diagram of the distribution of light spots of the second plano-concave mirror according to the present invention;
fig. 6 is a schematic diagram of the light spot distribution of the third concave mirror according to the present invention.
In the figure: 1. the absorption cell comprises an air inlet, 2 an air outlet, 3 a multi-pass absorption cell body, 4 a first flat concave mirror, 5 a second flat concave mirror, 6 a third flat concave mirror, 7 an incident light hole, 8 an emergent light hole.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-6, the novel annular planoconvex mirror optical multipass absorption cell of the present invention comprises a multipass absorption cell body 3, wherein a first planoconvex mirror 4, a second planoconvex mirror 5 and a third planoconvex mirror 6 are mounted on the multipass absorption cell body 3, and the first planoconvex mirror 4, the second planoconvex mirror 5 and the third planoconvex mirror 6 form a light annular closed loop; an air inlet 1 and an air outlet 2 are arranged on the multi-way absorption tank body 3; the first flat concave mirror 4 is provided with an incident light hole 7, and the second flat concave mirror 5 is provided with an emergent light hole 8.
Specifically, the included angles between the first flat concave mirror 4, the second flat concave mirror 5 and the third flat concave mirror 6 and the flat concave mirror lenses are all 60 degrees.
Specifically, the laser beam is emitted to the incident light hole 7, enters the absorption cell body through the incident light hole 7 of the first flat concave mirror 4, is reflected by the second flat concave mirror 5, is emitted to the third flat concave mirror 6, is reflected to the first flat concave mirror 4 again, is reflected for multiple times in the folding cavity to form stable light field distribution, and is emitted from the exit hole 8.
When in use, the gas to be detected is introduced from the gas inlet hole 1 and the gas outlet hole 2. Laser beams are enabled to emit to the incident light hole 7, enter the absorption cell body through the first flat concave mirror 4 and the incident light hole 7, then are reflected by the second flat concave mirror 5, and are incident to the third flat concave mirror 6 to be reflected to the first concave mirror 4 again, the laser beams are reflected for multiple times, stable optical field distribution is formed in the absorption cell body as shown in figures 4, 5 and 6, and meanwhile, a long absorption optical path is achieved. In a flat concave mirror to form a laser spot profile as shown or approximating figures 5, 6. And finally, the laser beam carrying the absorption information of the target gas to be detected is emitted from the light exit hole 8 of the second mirror surface mirror 4, so that the increase of the effective absorption optical path of the annular planoconcave mirror multi-pass absorption cell is realized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. The utility model provides a novel annular plano-concave mirror optics is led to absorption cell more, includes and leads to absorption cell body (3) more, its characterized in that: a first flat concave mirror (4), a second flat concave mirror (5) and a third flat concave mirror (6) are mounted on the multi-pass absorption tank body (3), and the first flat concave mirror (4), the second flat concave mirror (5) and the third flat concave mirror (6) form a light annular closed loop; an air inlet (1) and an air outlet (2) are arranged on the multi-way absorption tank body (3); an incident light hole (7) is formed in the first flat concave mirror (4), and an emergent light hole (8) is formed in the second flat concave mirror (5).
2. The novel annular planoconvex lens optical multipass absorption cell according to claim 1, wherein: the included angles between the first flat concave mirror (4), the second flat concave mirror (5) and the third flat concave mirror (6) are all 60 degrees.
3. The novel annular planoconvex lens optical multipass absorption cell according to claim 1, wherein: the laser beam irradiates to the incident light hole (7), enters the absorption cell body through the incident light hole (7) of the first flat concave mirror (4), is reflected by the second flat concave mirror (5), is incident to the third flat concave mirror (6) and is reflected to the first flat concave mirror (4) again, and is reflected for multiple times in the folding cavity to form stable light field distribution and finally is emitted from the emergent hole (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911908.0A CN110596005A (en) | 2019-09-25 | 2019-09-25 | Novel annular flat concave mirror optical multi-pass absorption pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910911908.0A CN110596005A (en) | 2019-09-25 | 2019-09-25 | Novel annular flat concave mirror optical multi-pass absorption pool |
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| CN110596005A true CN110596005A (en) | 2019-12-20 |
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| CN201910911908.0A Pending CN110596005A (en) | 2019-09-25 | 2019-09-25 | Novel annular flat concave mirror optical multi-pass absorption pool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557358A (en) * | 2020-11-25 | 2021-03-26 | 广东省测试分析研究所（中国广州分析测试中心） | Online fluorescence detection light path of water pollutant |
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| CN109655446A (en) * | 2019-01-22 | 2019-04-19 | 重庆大学 | A kind of △ type resonant cavity improving gas Raman intensity/integrating sphere joint enhancing chamber |
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2019
- 2019-09-25 CN CN201910911908.0A patent/CN110596005A/en active Pending
Patent Citations (15)
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| GB2044518A (en) * | 1979-02-22 | 1980-10-15 | Singer Co | Low loss apertures for ring laser gyros |
| US20030134427A1 (en) * | 2002-01-11 | 2003-07-17 | Chad Roller | Method and apparatus for determining gas concentration |
| EP1972922A1 (en) * | 2007-03-22 | 2008-09-24 | S.I.T. S.r.l. | Variable length herriott-type multipass cell |
| CN101281125A (en) * | 2008-05-19 | 2008-10-08 | 安徽敏测光电科技有限公司 | Method and apparatus for monitoring intelligent infrared multi-component harmful gas |
| EP2375237A1 (en) * | 2010-03-30 | 2011-10-12 | Scienza Industria Tecnologia S.r.l. | Herriott multipass cell with spherical mirrors and method for making it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112557358A (en) * | 2020-11-25 | 2021-03-26 | 广东省测试分析研究所（中国广州分析测试中心） | Online fluorescence detection light path of water pollutant |
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Application publication date: 20191220 |