Design of a Solar-blind Ultraviolet Imaging System for Corona Detection

Table 1. Main specifications of lens
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Table 1. Main specifications of lens
Parameter Value
Wavelength 240~280 nm
Field of view：2ω 56°
Focal length 8 mm
Relative aperture 1/2
Distortion <2.5%
Total length <90 mm
Back focal length >3 mm
MTF@110lp/mm >0.3

Table 2. Ideal image plane offset at each temperature
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Table 2. Ideal image plane offset at each temperature
Temperature/℃ -20 -10 0 10 20 30 40 50 60
Ideal offset/mm -0.132 9 -0.100 1 -0.06 7 -0.033 7 0 0.034 0.068 4 0.103 0.137 9

Table 3. Tolerance allocation

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Table 3. Tolerance allocation

Element number	Test plate fit tolerance /fringes	Radius tolerance /mm	Thickness tolerance /mm	Element wedge tolerances /mm	Barrel tilt tolerances /radians	Group displacement tolerances /mm
1	12	84/0.5	0.5/0.2	0.1	0.002 5	0.2
2	12	4.2/0.02	0.4/0.1	0.05	0.000 5	0.02
3	12	1.8/0.04	0.3/0.1	0.04	0.000 3	0.02
4	12	0.2/0.4	0.1/0.08	0.02	0.001 5	0.02
5	12	0.2/1.9	0.08/0.04	0.02	0.002 5	0.04
6	2	0.02	0.02/0.005	0.004	0.000 3	0.005
7	2	0.02	0.02	0.002	0.000 3	0.005
8	2	0.02	0.02/0.005	0.002	0.000 3	0.005
9	2	0.02	0.02	0.002	0.000 3	0.005
10	2	0.02	0.04/0.01	0.004	0.000 5	0.005
11	6	0.04/0.02	0.02/0.01	0.01	0.000 5	0.005
12	2	0.02/0.9	0.06	0.002	0.000 3	0.005

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Suhao CHEN, Bo LÜ, Weiqi LIU, Rui FENG, Zhonglun WEI. Design of a Solar-blind Ultraviolet Imaging System for Corona Detection[J]. Acta Photonica Sinica, 2022, 51(9): 0922001

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