CN211697465U - Optical absorption cell and photoelectric gas analyzer - Google Patents
Optical absorption cell and photoelectric gas analyzer Download PDFInfo
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- CN211697465U CN211697465U CN201921655857.1U CN201921655857U CN211697465U CN 211697465 U CN211697465 U CN 211697465U CN 201921655857 U CN201921655857 U CN 201921655857U CN 211697465 U CN211697465 U CN 211697465U
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Abstract
The utility model provides an optical absorption cell and a photoelectric gas analyzer, wherein the optical absorption cell comprises a container, and the container is provided with an inlet and an outlet; a first concave mirror disposed within the container; the second concave reflector is arranged in the container, and the reflecting surface of the second concave reflector is opposite to the reflecting surface of the first concave reflector; the third concave reflecting mirror is arranged in the container, and the reflecting surface is opposite to the reflecting surface of the first concave reflecting mirror and is arranged below and above the second concave reflecting mirror; the incident light is reflected on the third concave reflecting mirror, the first concave reflecting mirror and the second concave reflecting mirror in sequence, then is reflected by the first reflector, then is reflected on the second concave reflecting mirror, the first concave reflecting mirror and the third concave reflecting mirror in sequence, and then the emergent light is emitted to the second reflector; the second reflector and the first reflector are respectively positioned at two sides of the first concave reflecting mirror. The utility model has the advantages of low detection limit, small maintenance amount, miniaturization and the like.
Description
Technical Field
The utility model relates to a gas analysis, in particular to optical absorption cell.
Background
The absorption spectrum technology is a gas analysis technology with high speed, low power consumption, no material consumption and high precision, and is widely applied to the fields of industrial processes, safety and the like. The basic principle is as follows: the gas selectively absorbs light with fixed wavelength, and the gas content is obtained by analyzing the absorption amount of the light with fixed wavelength and then utilizing the values of optical path, temperature, pressure and the like according to the beer-Lambert law.
In order to reduce the lower limit value of the detection of the gas content, a gas cell is required to improve the absorption optical length. The gas cell realizes multiple reflections of light beams in a limited volume, so that the light beams have relatively long optical paths, the detection limit of gas quantitative analysis is improved from ppm to ppb level, and the gas quantitative analysis is a consistent exploration direction in the gas quantitative analysis.
The current gas pool designs are mostly: a plurality of plane mirrors are provided, and the detection light is reflected between the plane mirrors a plurality of times, thereby increasing the optical path. However, there are some problems such as:
1. the absorption optical path is not long enough, and primary reflection exists among a plurality of reflecting mirrors;
2. a plurality of reflectors are needed, so that the structural complexity is improved, a complex light path needs to be adjusted, and the workload is large;
3. the use of the plane reflector improves the divergence angle of light, namely the difficulty of subsequent focusing, and has poor optical performance.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model provides an optical absorption cell with long optical path, simple structure and low cost.
The utility model aims at realizing through the following technical scheme:
an optical absorption cell comprising a container having an inlet and an outlet; the optical absorption cell further comprises:
a first concave mirror disposed within the container;
the second concave reflector is arranged in the container, and the reflecting surface of the second concave reflector is opposite to the reflecting surface of the first concave reflector;
the third concave reflecting mirror is arranged in the container, and a reflecting surface is arranged opposite to the reflecting surface of the first concave reflecting mirror and arranged below and above the second concave reflecting mirror;
the first reflector is used for reflecting incident light on the third concave reflector, the first concave reflector and the second concave reflector in sequence, then reflecting the incident light by the first reflector, then reflecting the incident light on the second concave reflector, the first concave reflector and the third concave reflector in sequence, and then emitting light to the second reflector;
and the second reflector and the first reflector are respectively positioned at two sides of the first concave reflecting mirror.
The utility model aims at providing still that detect the low photoelectric type gas analyzer of lower limit, this invention purpose can be realized through following technical scheme:
the photoelectric gas analyzer comprises a light source and a detector; the photoelectric gas analyzer further includes:
the gas chamber adopts the optical absorption cell; the detection light emitted by the light source is incident on the third concave reflecting mirror, and the emergent light reflected by the third concave reflecting mirror is reflected to the detector by the second reflector.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the optical path is long;
the first reflector is arranged, so that the light emitted out of the second concave reflecting mirror deviates a certain angle or returns to the second concave reflecting mirror in parallel, and is reflected for multiple times among the three concave reflecting mirrors again, and the optical path is effectively improved;
the second reflector is arranged, so that detection light emitted by the light source and emergent light emitted by the concave reflector can be separated;
2. the lower detection limit is low;
the absorption spectrum technology is adopted to detect the content of the gas introduced into the container, and the detection precision is high, the lower detection limit is low, the energy consumption is low, and the response time is short;
the long optical path in the gas chamber increases the absorption of the gas to be detected on the detection light, and further reduces the lower detection limit;
3. the structure is simple, and the cost is low;
the first reflector and the second reflector are arranged, so that the structure is simple, and the cost is low;
4. the reflecting surfaces are all concave surfaces, so that the focusing effect is achieved, and the divergence angle of the light beam is reduced.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural diagram of an optical absorption cell according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of an optoelectronic gas analyzer according to an embodiment of the present invention, and as shown in fig. 1, the optoelectronic gas analyzer includes:
a light source 61, such as a semiconductor laser, the light source 61 for emitting detection light that can be absorbed by the gas to be measured; the light source 61 is prior art in the field of gas analysis, and the specific structure thereof is not described herein;
a detector 62, such as a photosensor, the detector 62 converting the detected light absorbed by the gas into an electrical signal; the detector 62 is prior art in the field of gas analysis, and the specific structure is not described here:
a gas cell employing an optical absorption cell, the optical absorption cell comprising:
the container is provided with an inlet and an outlet and is suitable for introducing gas to be detected into the container;
a first concave mirror 11, said first concave mirror 11 being disposed within said container;
a second concave reflector 12, said second concave reflector 12 being disposed within said container, the reflective surface being disposed opposite to the reflective surface of said first concave reflector 11;
a third concave reflector 13, wherein the third concave reflector 13 is arranged in the container, the reflecting surface is arranged opposite to the reflecting surface of the first concave reflector 11 and is arranged below and above the second concave reflector 12, and specifically, the second concave reflector 12 and the third concave reflector 13 are symmetrically arranged at two sides of the central axis of the first concave reflector 11;
radius of curvature R of the first concave mirror 111Focal length f1Radius of curvature R of said second concave mirror 122Focal length f2Radius of curvature R of said third concave mirror 133Focal length f3Satisfies the following conditions: r1＝R2＝R3、f1＝f2＝f3(ii) a The reflecting surfaces of the second concave reflecting mirror 12 and the third concave reflecting mirror 13 are positioned on the same circular arc, and the length of the central axis of the first concave reflecting mirror 11 between the reflecting surface of the first concave reflecting mirror 11 and the circular arc is 2f1；
A first reflector 21, such as a plane mirror, a pyramid prism or a hollow retroreflector, wherein incident light is reflected on the third concave mirror 13, the first concave mirror 11 and the second concave mirror 12 in sequence, then reflected by the first reflector 21, then reflected on the second concave mirror 12, the first concave mirror 11 and the third concave mirror 13 in sequence, and then emergent light is emitted to the second reflector 22;
the second reflector 22, for example, has a concave reflecting surface, and the second reflector 22 and the first reflector 21 are respectively located on both sides of the first concave reflecting mirror 11.
In order to effectively separate the detection light and the exit light, further, the second reflector has a through hole adapted to pass the incident light while reflecting the exit light onto the detector.
The photoelectric gas analyzer works in the following modes:
the detection light emitted by the light source passes through the second reflector, then is reflected on the third concave reflecting mirror, the first concave reflecting mirror and the second concave reflecting mirror in sequence, the light reflected out of the second concave reflecting mirror is reflected by the first reflector, is deflected by a certain angle or is parallel to the original light path direction (with a certain distance) and returns to the second concave reflecting mirror, then is reflected on the second concave reflecting mirror, the first concave reflecting mirror and the third concave reflecting mirror in sequence, and the emergent light reflected out of the third concave reflecting mirror is reflected to the detector by the second reflector;
the gas entering the container absorbs detection light, the detector receives the light selectively absorbed by the gas, and the content of the gas is obtained through analysis.
Example 2:
according to the utility model discloses embodiment 1's photoelectric type gas analysis appearance in the application example of industrial process gas analysis.
In this application example, as shown in fig. 1, a tunable semiconductor laser is used as the light source 61, and a photoelectric sensor is used as the detector 62; the reflecting surfaces of the larger first concave reflecting mirror 11, the smaller second concave reflecting mirror 12 and the third concave reflecting mirror 13 are coated with high reflecting films, and the reflectivity is over 99.9 percent if; the first reflector 21 adopts a pyramid prism, and the reflected light and the incident light are parallel but have a certain distance; the second reflector 22 has a concave reflecting surface and a through hole, and the detection light emitted from the light source 61 passes through the through hole (or the through hole is filled with a material that transmits the detection light), and at the same time, the concave reflecting surface reflects the exit light to the detector 62.
Claims (10)
1. An optical absorption cell comprising a container having an inlet and an outlet; the method is characterized in that: the optical absorption cell further comprises:
a first concave mirror disposed within the container;
the second concave reflector is arranged in the container, and the reflecting surface of the second concave reflector is opposite to the reflecting surface of the first concave reflector;
the third concave reflecting mirror is arranged in the container, and a reflecting surface is arranged opposite to the reflecting surface of the first concave reflecting mirror and arranged below and above the second concave reflecting mirror;
the first reflector is used for reflecting incident light on the third concave reflector, the first concave reflector and the second concave reflector in sequence, then reflecting the incident light by the first reflector, then reflecting the incident light on the second concave reflector, the first concave reflector and the third concave reflector in sequence, and then emitting light to the second reflector;
and the second reflector and the first reflector are respectively positioned at two sides of the first concave reflecting mirror.
2. The optical absorption cell of claim 1 wherein: and the reflecting surfaces of the second concave reflecting mirror and the third concave reflecting mirror are positioned on the same circular arc.
3. The optical absorption cell according to claim 2 wherein: radius of curvature R of the first concave mirror1Focal length f1Radius of curvature R of said second concave mirror2Focal length f2Radius of curvature R of said third concave mirror3Focal length f3Satisfies the following conditions: r1＝R2＝R3、f1＝f2＝f3。
4. The optical absorption cell according to claim 2 wherein: the second concave reflecting mirror and the third concave reflecting mirror are symmetrically arranged on two sides of the central axis of the first concave reflecting mirror.
5. The optical absorption cell of claim 1 wherein: the second reflector has a through hole adapted for the incident light to pass through.
6. The optical absorption cell of claim 5 wherein: the through hole is filled with a material that transmits the incident light.
7. The optical absorption cell of claim 1 wherein: the first reflector is a mirror or a corner cube prism or a hollow retroreflector.
8. The optical absorption cell of claim 1 wherein: the second reflector has a concave reflective surface.
9. The photoelectric gas analyzer comprises a light source and a detector; the method is characterized in that: the photoelectric gas analyzer further includes:
a gas cell using the optical absorption cell according to any one of claims 1 to 6; the detection light emitted by the light source is incident on the third concave reflecting mirror, and the emergent light reflected by the third concave reflecting mirror is reflected to the detector by the second reflector.
10. The optoelectronic gas analyzer of claim 9, wherein: the detection light passes through the second reflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921655857.1U CN211697465U (en) | 2019-09-30 | 2019-09-30 | Optical absorption cell and photoelectric gas analyzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921655857.1U CN211697465U (en) | 2019-09-30 | 2019-09-30 | Optical absorption cell and photoelectric gas analyzer |
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| CN211697465U true CN211697465U (en) | 2020-10-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484266A (en) * | 2021-05-28 | 2021-10-08 | 汉威科技集团股份有限公司 | Optical path multiplying device and optical path multiplying gas absorption cell |
| CN113567393A (en) * | 2021-07-29 | 2021-10-29 | 湖南五凌电力科技有限公司 | Online monitoring system for dissolved gas in laser spectrum oil |
| CN113640249A (en) * | 2021-07-08 | 2021-11-12 | 杭州春来科技有限公司 | Formaldehyde detection system based on tunable laser spectrometry and detection method thereof |
-
2019
- 2019-09-30 CN CN201921655857.1U patent/CN211697465U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113484266A (en) * | 2021-05-28 | 2021-10-08 | 汉威科技集团股份有限公司 | Optical path multiplying device and optical path multiplying gas absorption cell |
| CN113640249A (en) * | 2021-07-08 | 2021-11-12 | 杭州春来科技有限公司 | Formaldehyde detection system based on tunable laser spectrometry and detection method thereof |
| CN113567393A (en) * | 2021-07-29 | 2021-10-29 | 湖南五凌电力科技有限公司 | Online monitoring system for dissolved gas in laser spectrum oil |
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