CN209372679U - Long light path sample cell for gas concentration detection - Google Patents
Long light path sample cell for gas concentration detection Download PDFInfo
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- CN209372679U CN209372679U CN201822217781.6U CN201822217781U CN209372679U CN 209372679 U CN209372679 U CN 209372679U CN 201822217781 U CN201822217781 U CN 201822217781U CN 209372679 U CN209372679 U CN 209372679U
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Abstract
The utility model provides a kind of long light path sample cell for gas concentration detection, is related to field of spectral analysis technology, comprising: triangular prism, gas cell and multiple prism of corner cubes；Wherein, multiple prism of corner cubes are separately mounted to the both ends composition higher order reflection optical path of gas cell；Triangular prism is mounted on the emergent light path of prism of corner cube so that from the higher order reflection optical path that the light that prism of corner cube reflects comes back to prism of corner cube.The device optical length can accurately detect light concentration gas, convenient for safeguarding, and wiping will not influence reflection efficiency for a long time.
Description
Technical field
The utility model relates to field of spectral analysis technology, in particular to a kind of length for gas concentration detection
Path-length cell.
Background technique
With the growth and expanding economy of population, China is faced with extremely serious problem of environmental pollution.So grinding
The analysis instrument that system is capable of real-time monitoring environmental gas is of great significance to the living environment for improving the mankind.But due to pollution
Gas is mostly the light concentration gas for being lower than ppm magnitude or even ppb magnitude, and required optical system must have sufficiently long light
Journey can be only achieved the requirement of detection accuracy.Traditional multiple reflecting pool mainly includes the pond White and the pond Herriott.The former spy
Point is constituted using the concave mirror of three pieces of same curvature radiuses, and the latter is constituted using two pieces of concave mirrors.In order to reach
To high reflectance, highly reflecting films must be coated on reflecting mirror, majority is metallic reflective coating, for non-expendable eyeglass, daily dimension
Shield needs wiped clean, so the just necessary extreme care in wiping, will affect its reflection efficiency by wiping for a long time.
Utility model content
The utility model aims to solve at least one of above-mentioned technical problems existing in the prior art or related technologies, open
A kind of long light path sample cell for gas concentration detection, the device optical length can accurately detect light concentration gas, be convenient for
Maintenance, wiping will not influence reflection efficiency for a long time.
The utility model is to be achieved by the following technical programs:
A kind of long light path sample cell for gas concentration detection, comprising: triangular prism, gas cell and multiple pyramid ribs
Mirror；Wherein, multiple prism of corner cubes are separately mounted to the both ends composition higher order reflection optical path of gas cell；Triangular prism is mounted on pyramid
On the emergent light path of prism so that from the higher order reflection optical path that the light that prism of corner cube reflects comes back to prism of corner cube.
According to the long light path sample cell provided by the utility model for gas concentration detection, it is preferable that further include being used for
The optical fiber of emergent ray is received and couples, optical fiber connects detector.
According to the long light path sample cell provided by the utility model for gas concentration detection, it is preferable that detector is light
Spectrometer.
The utility model obtain beneficial effect include:
Light is set repeatedly to turn back in gas cell using the reflection technology (using prism of corner cube as reflecting element) of light, simultaneously
Guarantee energy loss as few as possible, realizes that light path lengthens in the gas cell of limited volume.The utility model can not have to
In prism of corner cube surface coating, wiping will not influence its reflection efficiency for a long time, and prism of corner cube is not by incident angle
It influences, the incident ray of clear aperature is entered for any bar, all will efficiently be reflected back by former direction.
Detailed description of the invention
Fig. 1 is shown to be shown according to the optical path of the long light path sample cell for gas concentration detection of the utility model embodiment
It is intended to.
Fig. 2 shows the pyramid ribs according to the long light path sample cell for gas concentration detection of the utility model embodiment
Mirror arrangement mode side view.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.
The design principle of the utility model are as follows:
According to lambert-Bill's absorption law it is found that the variation of the absorption spectrum of sample depends on sample constituent concentration
And optical length, the product abbreviation concentration light path product of the two.
I0(λ) is incident intensity, and I (λ) is transmitted intensity, and C is gas concentration, and L is optical length, σ (λ) extinction system
Number, it is related with the wavelength X of the property and incident light that absorb gas.
Certain gas is detected for same instrument, due to the signal-to-noise ratio of instrument be it is certain, reach the detection pole of the gas
Concentration light path product in limited time is certain value, and tested gas detection concentration can be released when known to light path.Vice versa.Due to inspection
Surveying object is polluted gas in environment, for the light concentration gas lower than ppm magnitude, so needing to reach sufficiently long light path
Meet detection needs.
The utility model realizes increase light path with the method that prism of corner cube and triangular prism combine.Optical system packet
Include light source, colimated light system, measurement gas chamber and detector.Micro-prism array is separately mounted to the both ends of gas cell.From light source
The light beam of sending beats light on prism of corner cube after colimated light system collimates, and successively reflects through it, final emergent ray passes through
After fiber coupling, the work such as acquisition are completed into detector.It succinctly can easily increase light path with such method.Light path
Length can also be adjusted by the number of the distance between two micro-prism array He prism of corner cube, to reach experiment institute
The optical path length needed.
Specifically, as depicted in figs. 1 and 2, the utility model discloses a kind of long light path samples for gas concentration detection
Product pond, comprising: triangular prism, gas cell and multiple prism of corner cubes；Wherein, multiple prism of corner cubes are separately mounted to the two of gas cell
End composition higher order reflection optical path；Triangular prism, which is mounted on, to be reflected on the emergent light path of prism of corner cube so as to from prism of corner cube
Light comes back in the higher order reflection optical path of prism of corner cube.
In this embodiment, it is provided with eight prism of corner cubes and a triangular prism, by four pieces of micro-prism array (number
For 2,4,5,7) be mounted on one end of gas cell, by remaining prism of corner cube (number 1,3,6,8) and a triangular prism installation
In the other end of gas cell.The light beam issued from light source, into test section, light is beaten in pyramid rib after colimated light system collimates
On mirror 1, through its total reflection, it is reflected on prism of corner cube 2, then reflexed on prism of corner cube 3 through prism of corner cube 2, through prism of corner cube 3
It is reflected on prism of corner cube 4, is reflected on triangular prism through prism of corner cube 4, light is gone back into prism of corner cube 5 through triangular prism
On, and so on, finally from 8 emergent ray of prism of corner cube, after fiber coupling, the work such as acquisition are completed into spectrometer.
In this embodiment, position can be interchanged in optical light source and detector.
One piece of triangular prism can be added in the position of detector, by anaclasis to the other end, make optical light source and detector point
Other places are in the both ends of sample cell.
Ultraviolet source is selected, the various monochromatic sources such as infrared light supply also can be selected.
Spectrum is analyzed with spectrometer, detection and letter that other detectors such as photoelectric detector probe carry out light also can be selected
Number analysis.
According to above-described embodiment, the utility model is made using the reflection technology (using prism of corner cube as reflecting element) of light
Light is repeatedly turned back in gas cell, while guaranteeing energy loss as few as possible, realizes light in the gas cell of limited volume
Cheng Jiachang.The utility model can not have in prism of corner cube surface coating, and wiping will not influence its reflection efficiency for a long time, and
And prism of corner cube is not influenced by incident angle, and the incident ray of clear aperature is entered for any bar, all will efficiently be pressed
Former direction reflects back.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (3)
1. a kind of long light path sample cell for gas concentration detection characterized by comprising triangular prism, gas cell and more
A prism of corner cube；Wherein, multiple prism of corner cubes are separately mounted to the both ends composition higher order reflection optical path of the gas cell；Institute
Triangular prism is stated to be mounted on the emergent light path of prism of corner cube so that the light reflected from prism of corner cube comes back to pyramid rib
In the higher order reflection optical path of mirror.
2. the long light path sample cell according to claim 1 for gas concentration detection, which is characterized in that further include being used for
The optical fiber of emergent ray is received and couples, the optical fiber connects detector.
3. the long light path sample cell according to claim 2 for gas concentration detection, which is characterized in that the detector
For spectrometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822217781.6U CN209372679U (en) | 2018-12-27 | 2018-12-27 | Long light path sample cell for gas concentration detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822217781.6U CN209372679U (en) | 2018-12-27 | 2018-12-27 | Long light path sample cell for gas concentration detection |
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| CN209372679U true CN209372679U (en) | 2019-09-10 |
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| CN201822217781.6U Active CN209372679U (en) | 2018-12-27 | 2018-12-27 | Long light path sample cell for gas concentration detection |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578832A (en) * | 2020-04-30 | 2020-08-25 | 南京理工大学 | Short coherent light source interferometer-based long-stroke optical path matching device and experimental method |
| CN111896492A (en) * | 2020-06-29 | 2020-11-06 | 山东师范大学 | Long-optical-path gas detection system and method based on quantum cascade laser |
| WO2021212931A1 (en) * | 2020-04-23 | 2021-10-28 | 山东省科学院激光研究所 | Two-dimensional, multi-point-reflection, long-optical-distance gas sensor probe, and gas sensor |
| CN114047133A (en) * | 2022-01-12 | 2022-02-15 | 山东省科学院激光研究所 | Optical path adjustable multi-point reflection gas absorption pool |
| CN114993989A (en) * | 2022-07-18 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection module and system |
-
2018
- 2018-12-27 CN CN201822217781.6U patent/CN209372679U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212931A1 (en) * | 2020-04-23 | 2021-10-28 | 山东省科学院激光研究所 | Two-dimensional, multi-point-reflection, long-optical-distance gas sensor probe, and gas sensor |
| CN111578832A (en) * | 2020-04-30 | 2020-08-25 | 南京理工大学 | Short coherent light source interferometer-based long-stroke optical path matching device and experimental method |
| CN111896492A (en) * | 2020-06-29 | 2020-11-06 | 山东师范大学 | Long-optical-path gas detection system and method based on quantum cascade laser |
| CN114047133A (en) * | 2022-01-12 | 2022-02-15 | 山东省科学院激光研究所 | Optical path adjustable multi-point reflection gas absorption pool |
| CN114993989A (en) * | 2022-07-18 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection module and system |
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