Design of cooled medium-wave infrared polarization imaging optical system

Xingyang Liu; Shangli Zhai; Jing Li; Yang Wang; Feng Miao; Hanyu Du; Chaofan Zou

doi:10.3788/IRLA20200208

Journals >Infrared and Laser Engineering >Volume 50 >Issue 2 >Page 20200208 > Article

Infrared and Laser Engineering
Vol. 50, Issue 2, 20200208 (2021)

Design of cooled medium-wave infrared polarization imaging optical system

Xingyang Liu¹, Shangli Zhai², Jing Li³, Yang Wang², Feng Miao¹, Hanyu Du¹, and Chaofan Zou¹

Author Affiliations

¹Nanjing Les Electronic Equipment Co. LTD, Nanjing 210014, China

²The 28th Research Institute of China Electronics Technology Group Corporation, Nanjing 210007, China

³31105 Army, Nanjing 210000, China

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DOI: 10.3788/IRLA20200208 Cite this Article

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 Copy Citation Text

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Fig. 9. [in Chinese]

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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 1. [in Chinese]

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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 2. [in Chinese]

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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 3. [in Chinese]

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	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
Tilt/(″)	5-16	40

Table 4. [in Chinese]

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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

Table 5. [in Chinese]

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