Athermalized design of airborne optical system with wide spectrum and large target surface

Table 1. Design requirements
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Table 1. Design requirements
Parameter Value
Wavelength/μm 0.4-1.7
Focal length/mm 120
Field of view 2ω/(°) 14
F number 2
Overall length/mm ≤200
Temperature range/℃ −40-60
MTF@50 lp/mm >0.2
Distortion <1%

Table 2. Maximum distortion at different working wavelengths
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Table 2. Maximum distortion at different working wavelengths
Temperature/℃ Maximum distortion
0.4-0.75 μm 0.75-1.0 μm 1.0-1.7 μm
–40 0.5098% 0.5031% 0.4959%
0 0.5101% 0.5034% 0.4962%
20 0.5102% 0.5035% 0.4963%
60 0.5096% 0.5030% 0.4959%

Table 3. RMS radius at different temperatures and field of view
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Table 3. RMS radius at different temperatures and field of view
Temperature/℃ RMS radius/μm
0° 2.33° 4.67° 7°
–40 6.645 6.597 7.145 12.510
0 6.186 6.279 7.106 12.370
20 6.070 6.372 7.556 12.571
60 5.767 6.160 7.585 13.004

Table 4. Tolerance data

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Table 4. Tolerance data

Parameter		Tolerances
Surface tolerances	Radius/fringes	2
	Thickness/mm	0.03
	Decenter X or Y/mm	0.01
	Tilt X or Y/(°)	0.01
	S+A irregularity	0.3

Index tolerances	Index	0.001
Index tolerances	Abbe	0.3%

Element tolerances	Decenter X or Y/mm	0.02
Element tolerances	Tilt X or Y/(°)	0.05

Table 5. Monte Corle analysis results
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Table 5. Monte Corle analysis results
Probability MTF at 50 lp/mm
0.4-0.75 μm 0.75-1.0 μm 1.0-1.7 μm
98%> 0.334 0.386 0.319
90%> 0.381 0.427 0.354
80%> 0.410 0.459 0.377
50%> 0.457 0.530 0.432
20%> 0.503 0.598 0.483
10%> 0.526 0.635 0.510
2%> 0.563 0.667 0.538

Table 6. Test results of MTF

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Table 6. Test results of MTF

FOV/(°)	0.4-0.75 μm		0.75-1.0 μm		1.0-1.7 μm
FOV/(°)	Sagittal MTF	Tangential MTF	Sagittal MTF	Tangential MTF	Sagittal MTF	Tangential MTF
−7	0.577	0.518	0.679	0.615	0.535	0.511
−5	0.742	0.546	0.781	0.594	0.560	0.484
−3	0.755	0.677	0.717	0.677	0.491	0.485
0	0.700	0.707	0.630	0.640	0.410	0.445
3	0.715	0.687	0.703	0.671	0.484	0.471
5	0.651	0.589	0.742	0.654	0.529	0.472
7	0.513	0.536	0.597	0.630	0.539	0.460

Table 7. Test results of maximum distortion
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Table 7. Test results of maximum distortion
Waveband/μm Maximum distortion of −7° Maximum distortion of 7°
0.4-0.75 0.6086% 0.5333%
0.75-1.0 0.5829% 0.5128%
1.0-1.7 0.4774% 0.5736%

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Yuting ZOU, Yongtao LONG, Mouxin WANG, Donglin MA. Athermalized design of airborne optical system with wide spectrum and large target surface[J]. Infrared and Laser Engineering, 2025, 54(3): 20240618

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