Design of cooled medium-wave infrared polarization imaging optical system

Imaging method		Advantages	Disadvantages
Time-sharing polarization imaging	Rotating polarizer	Simple system structure; Low cost; Small energy loss; High spatial resolution	Poor real-time performance; Poor reliability of moving parts
Time-sharing polarization imaging	Electrically tuned LCD	Simple system structure; Small size; Easy to adjust; High spatial resolution	Poor real-time performance; Large energy loss
Simultaneous polarization imaging	Amplitude sharing	Good real-time performance; High spatial resolution	Complex structure; High adjustment requirements; Big size; Large energy loss; High cost
	Aperture sharing	Good real-time performance; Relatively low cost; Compact structure	Relatively complex structure; Loss of spatial resolution
	Focal plane sharing	Good real-time performance; Small size; Compact structure; High integration	High adjustment requirements; Instantaneous field of view error; Loss of spatial resolution

Table 2. [in Chinese]
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Table 2. [in Chinese]
Parameter Value
Wavelength/μm 3.7-4.8
Focal length/mm 240
F^# 6
Field/(°) 1.15×0.92
Number of pixels 320×256
Pixel size/μm² 30×30

Table 3. [in Chinese]

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Table 3. [in Chinese]

Structure of polarization imaging optical system	Number of optical elements per channel	Transmittance estimation
注：根据当前红外透镜镀膜工艺水平以及线偏振片的性能，透过率估算过程中取红外透镜单面透过率为98%，偏振片透过率为85%
	12 lenses 1 polarizer	52.4%
	10 lenses 1 polarizer	56.8%
	13 lenses 1 polarizer	50.2%
	12 lenses 2 wave plates 1 polarizer	< 48.3%

Table 4. [in Chinese]
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Table 4. [in Chinese]
Surface Tolerance
Test plate fit 1-16 2
Irregularity 1-16 0.5
Thickness/mm 1-16 0.02
Decenter/mm 1-16 0.02
Tilt/(″) 1-4 30
5-16 40

Table 5. [in Chinese]

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Table 5. [in Chinese]

Surface	Clipping aperture	YNI/mm	I/IBAR
1	13 (R)	1.726	3.85
2	13 (R)	−2.12	1.924
3	13 (R)	−2.206	2.024
4	13 (R)	−0.623	1.283
5	13 (R)	−0.395	1.578
6	13 (R)	−0.393	1.578
7	13 (R)	0.486	−1.887
8	13 (R)	0.096	−0.382
9	13 (R)	−0.95	4.703
10	13 (R)	−0.416	1.845
11	13 (R)	−0.471	2.253
12	13 (R)	−0.919	5.709
13	20 (R)	0.169	2.086
14	20 (F)	0.043	−0.249
15	20 (R)	0.693	2.647
16	20 (F)	0.167	−1.241

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Xingyang Liu, Shangli Zhai, Jing Li, Yang Wang, Feng Miao, Hanyu Du, Chaofan Zou. Design of cooled medium-wave infrared polarization imaging optical system[J]. Infrared and Laser Engineering, 2021, 50(2): 20200208

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