Multi-optical path gas absorption chamber and measurement system thereof

A gas absorption and multi-light path technology, which is applied in the field of gas absorption spectrum quantitative analysis, can solve problems such as the inability to design even-numbered columns, and achieve the effects of improving the effective absorption light path, reducing the detection limit, and increasing the light path

Active Publication Date: 2017-08-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the above-mentioned multi-path absorption cavity is present in the field mirror F 1 , F 2 The matrix-type spots formed on the surface can only be odd-numbered columns, and it is impossible to design even-numbered columns

Method used

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  • Multi-optical path gas absorption chamber and measurement system thereof
  • Multi-optical path gas absorption chamber and measurement system thereof
  • Multi-optical path gas absorption chamber and measurement system thereof

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Embodiment 1

[0055] For an even-state multi-path gas absorption cavity, the number of rows m is any positive integer (m=1, 2, 3...), and the number of columns n is any even number (n=2, 4, 6.. ....), in order to make full use of the mirror space of the field mirror, it is generally required that the spot overlap occurs on the field mirror, that is, m≥2, n≥2. Objective lens M 1 ~ M 4 The center of curvature of Figure 4 as shown, Figure 4 The midpoint O is the main mirror F 1 The vertex of the sphere, establish a three-dimensional Cartesian coordinate system with point O as the coordinate origin, then F 2 The spherical apex coordinates of the sphere are ((0, (2m-1)c, 0), the spherical apexes of the main field lens and the auxiliary field lens are vertically distributed; the curvature center coordinates of each objective lens are: C M1 (w, G, 0), C M2 (w, -c, 0), C M3 (0 ， G, 0), C M4 (0, -c, 0); the coordinates of the curvature centers of the two field mirrors are: F 1 (0,0,R),F ...

Embodiment 2

[0084] For an odd-state multi-path gas absorption cavity, when the number of rows m is any positive integer (m=1, 2, 3...), the number of columns n is any odd number (n=1, 3, 5... ...), it is also required that spot overlap occurs on the field lens, that is, m≥2, n≥3. Objective lens M 1 ~ M 4 The center of curvature of Figure 7 As shown, still take the main mirror F 1 The spherical vertex O of the coordinate origin establishes a three-dimensional Cartesian coordinate system, then F 2 The spherical apex coordinates of the sphere are ((0, (2m-1)c, 0), the spherical apexes of the main field lens and the auxiliary field lens are vertically distributed; the curvature center coordinates of each objective lens are: C M1 (0, c, 0), C M2 (0, -c, 0), C M3 (-w, c, 0), C M4 (-w, -c, 0); the coordinates of the center of curvature of the two field mirrors are still: F 1 (0, 0, R), F 2 (0, (2m-1)c, R). The center coordinates of the entrance window are I((n-1)w, (2m-1)c, 0). Light...

Embodiment 3

[0107] The principle of the direct absorption method to measure the gas absorption spectrum of the system is based on the Lambert-Beer law, that is, when a beam of parallel light passes through a uniform non-scattering light-absorbing substance (such as a trace gas to be measured), its absorbance A is the same as the measured absorbance The concentration C of the substance is proportional to the thickness l of the absorbing layer:

[0108] A(λ)=ln[I 0 (λ) / I(λ)]=ln[1 / T(λ)]=σ(λ)Cl

[0109] where I 0 (λ) and I(λ) are the light intensity before the incident absorption sample and the transmitted light intensity after passing through the sample at a specific wavelength λ, respectively, A(λ) is called the absorbance (or optical density), and T(λ) is The transmittance of the sample to be tested, that is, the ratio of the transmitted light intensity to the incident light intensity, C is the concentration of the sample to be tested, l is the optical path length of the light passing th...

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Abstract

The invention discloses an even state multi-optical path gas absorption chamber. According to the even state multi-optical path gas absorption chamber, by changing the curvature center positions of two objective lenses in a traditional Chernin type MMS four-objective lens multi-optical path absorption chamber, the light spots positioned at the (m-1) row*(n-1) column and excluding the light spots at the columns corresponding to the incidence point and the emergence point on the main field lens are re-used four times, and the light spots at the column corresponding to the incidence point and at one row on the auxiliary field lens are re-used twice, such that the total passing number in the chamber is increased to (4m-2).(2n-1), and the optical path is increased by about 1 time compared to the structure provided by the traditional Chernin so as to substantially improve the effective absorption optical path and reduce the detection limit of the instrument in the case of the unchanged absorption chamber volume. The invention further discloses an odd state multi-optical path gas absorption chamber. The present invention further discloses a corresponding measurement system.

Description

technical field [0001] The invention relates to the technical field of gas absorption spectrum quantitative analysis, in particular to a multi-light path gas absorption cavity and a measurement system thereof. Background technique [0002] Multi-path gas absorption chamber is an important device widely used in trace gas quantitative analysis instruments. Based on the Lambert-Beer absorption law, the principle of multiple reflections of light in the limited volume of the gas cell is used to increase the detection light absorption path, thereby reducing the detection limit of the concentration of trace gas detection (up to ppbv level). [0003] At present, there are mainly two methods to increase the absorption optical path: 1. Long optical path differential optical absorption spectroscopy (LP-DOAS), by directly increasing the distance between the transceiver device of the probe light and the cooperative target in space. To improve the absorption optical path, the transceiver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/31
CPCG01N21/01G01N21/31
Inventor 杨铮郭崟孙利群
Owner TSINGHUA UNIV
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