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Positioning method of four objective lens groups in chernin type multi-path gas absorption cavity

A gas absorption and multi-path technology, applied in the field of quantitative analysis of ultraviolet-visible spectra, can solve problems such as difficulty in realization, difficulty in adjustment, and unsatisfactory stability for a long time, and achieve the effect of improving the efficiency of installation and adjustment

Active Publication Date: 2018-01-16
TSINGHUA UNIV
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Problems solved by technology

[0003] The Chernin type four-objective lens multi-optical path folding cavity is conventionally used, and the four objective lens groups all use traditional spherical mirrors (the apex of the spherical surface is at the center of the circular diaphragm). In order to realize the designed absorption optical path, the four objective lenses must be separately The angle adjustment of pitch and yaw is very difficult to adjust in practice. Considering the vibration, it is very difficult to satisfy all the mirrors to reach the designed absolute position value at the same time, and the stability cannot be satisfied for a long time. which mirror is misaligned

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  • Positioning method of four objective lens groups in chernin type multi-path gas absorption cavity
  • Positioning method of four objective lens groups in chernin type multi-path gas absorption cavity
  • Positioning method of four objective lens groups in chernin type multi-path gas absorption cavity

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[0019] In order to make the object, technical solution, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0020] figure 1 It is a block diagram of the test system based on the Chernin type multi-path gas absorption cavity. It includes a coupling-in unit 101 , a Chernin type multi-path gas absorption cavity 102 , a coupling-out unit 103 and a spectrum detection unit 104 . The coupling-in unit 101 includes a light collector, a multimode fiber, a collimator, etc., the coupling-out unit 103 includes a coupling lens, and the spectrum detection unit 104 includes a spectrometer.

[0021] The two ends of the Chernin-type multi-path gas absorption cavity 102 are respectively provided with four objective lens groups 11 and a convex field lens group 12, as shown in FIG. figure 2 shown.

[0022] In the present invention, the four objective lens group 11 is four su...

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Abstract

The invention discloses a four-objective lens group positioning method of a Chernin-type multi-optical path gas absorption cavity. The method includes: cutting a mother spherical mirror to form four sub-spherical mirrors of the four-objective lens group; The target curvature center coordinates have a relative conjugate positional relationship, and the target curvature center coordinates of each sub-spherical mirror are determined; each sub-spherical mirror is translated to its corresponding target curvature center coordinate point. By adopting the present invention, the installation and adjustment efficiency can be improved while ensuring the same excellent output image quality.

Description

technical field [0001] The invention relates to the technical field of ultraviolet-visible spectrum quantitative analysis, in particular to a method for positioning four objective lens groups of a Chernin type multi-optical path gas absorption cavity. Background technique [0002] The multi-path gas absorption cavity is an important part of the gas quantitative analysis instrument based on the principle of optical absorption. Based on Lambert-Beer's absorption law, when the light source intensity and the noise equivalent optical power and quantum efficiency of the detection system are given, increasing the absorption path length of the gas can make the detection limit of the gas quantitative analysis of the instrument reach the ppbv level, improving Detection sensitivity. This is of great significance to atmospheric environment monitoring. [0003] The Chernin type four-objective lens multi-optical path folding cavity is conventionally used, and the four objective lens gro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/182
Inventor 郭崟孙利群刘子龙
Owner TSINGHUA UNIV