Quadruplet objective lens Chernin type multi-optical-distance gas absorption cavity
A gas absorption and multi-path technology, applied in the field of quantitative analysis of ultraviolet-visible spectroscopy, can solve problems such as long-term stability, difficulty in realization, and difficulty in actual adjustment, so as to reduce manual maintenance costs and improve installation and adjustment efficiency.
Active Publication Date: 2016-07-20
TSINGHUA UNIV
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[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 It is very difficult to adjust the pitch and yaw angles to the preset conjugate positions. Considering the vibration, it is difficult to achieve the absolute conjugate position value of the space designed for all mirrors at the same time, and the stability cannot be satisfied for a long time. , and when it is out of tune, it is impossible to judge which mirror is out of tune
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[0016] 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.
[0017] 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.
[0018] The two ends of the Chernin type multi-path gas absorption cavity 102 are respectively provided with an objective lens 11 and a convex field lens group 12 oppositely, such as figure 2 shown. image 3 It is a schematic diagram of the size and area division of the quadruplet ob...
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The invention discloses a quadruplet objective lens Chernin type multi-optical-path gas absorption cavity; two ends of the quadruplet objective lens Chernin type multi-optical-path gas absorption cavity are respectively oppositely provided with an objective lens and a convex field lens group; the convex field lens group includes a first concave reflecting mirror and a second concave reflecting mirror with vertically distributed spherical vertex coordinates; the objective lens includes four spherical reflecting mirror regions; the curvature radii of all the region surfaces are the same and are a basic optical path R; in the XY axis directions, the curvature center coordinates have the relative conjugated position relationship. With use of the quadruplet objective lens Chernin type multi-optical-path gas absorption cavity, the longer optical absorption length can be provided for a noncoherent broadband light source in a certain small volume range, the output light excellent image quality is guaranteed, the instrument detection requirements of high sensitivity and low detection limit are facilitated, at the same time, in an optical-mechanical system, the number of adjusting elements is reduced, the assembling and adjusting efficiency is improved, and the maintenance cost is reduced.
Description
technical field [0001] The invention relates to the technical field of ultraviolet-visible spectrum quantitative analysis, in particular to a Chernin type multi-light path gas absorption cavity of a quadruplet objective lens. 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 groups all use traditional sp...
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Inventor 郭崟孙利群刘子龙杨怀栋
Owner TSINGHUA UNIV