Design of Integrated Cloud Detection Optical System from Visible to Terahertz Bands

Haiwei Jiang; Xinhua Niu

doi:10.3788/AOS221433

Acta Optica Sinica, Volume. 43, Issue 6, 0612008(2023)

Design of Integrated Cloud Detection Optical System from Visible to Terahertz Bands

Haiwei Jiang^1,2,3 and Xinhua Niu^1,3、*

¹Key Laboratory of Infrared System Detection and Imaging Technology, Chinese Academy of Sciences, Shanghai 200083, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

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Figures & Tables(12)

Fig. 1. Initial structure of coaxial three-mirror system

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Fig. 2. Design results of off-axis three-mirror system. (a) Optical layout of off-axis three-mirror system; (b) visible and infrared spot diagrams; (c) THz spot diagram

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Fig. 3. Design results of VNIR. (a) Optical layout; (b) MTF curves; (c) spot diagram

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Fig. 4. Design results of SWIR.(a) Optical layout of SWIR system; (b) MTF curves; (c) spot diagram

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Fig. 5. Design results of TIR. (a) Optical layout of TIR system; (b) MTF curves; (c) spot diagram

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Fig. 6. Overall diagram of integrated optical system

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Table 1. Channel set

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Table 1. Channel set

Band	Central wavelength /μm	Resolution /m	Utilization
1	0.470	75	True color（blue）
2	0.550	75	True color（green）
3	0.650	75	True color（red），optical thickness
4	0.865	75	Optical thickness
5	1.600	100	Optical thickness，effective particle radius
6	2.100	100	Effective particle radius
7	8.000	100	Cloud phase
8	11.000	100	Cloud phase，cloud top temperature，effective particle radius
9	12.000	100	Cloud phase，cloud top temperature，effective particle radius
10	343.250（874 GHz）	10000	Ice water path

Table 2. Design parameters of system

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Table 2. Design parameters of system

Parameter	THz	VNIR	SWIR	TIR
F number	3	2	2	2
Wavelength /μm	324.680-364.080 ［（874±50）GHz］	0.470-0.865	1.600-2.100	8.000-12.000
Input aperture /mm	150	42	68	68
IFOV（instantaneous field of view）/mrad	22.00	0.17	0.22	0.22

Table 3. Tolerance of telescope system

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Table 3. Tolerance of telescope system

Tolerance	PM	SM	TM
x/y decentered tolerance /mm	0.10	0.05	0.05
x/y tilt tolerance /（″）	30	30	30
Radius tolerance /mm	0.2	0.2	0.2
Conical coefficient tolerance	0.0010	0.0010	0.0005
Surface tolerance（λ=632.8 nm）	λ/25	λ/25	λ/25

Table 4. Tolerance of VNIR optical system
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Table 4. Tolerance of VNIR optical system
Tolerance PM/ SM/ TM
x/y decentered tolerance /mm 0.05
x/y tilt tolerance /（″） 30
Radius tolerance /mm 0.2
Conical coefficient tolerance 0.001
Surface tolerance（λ=632.8 nm） λ/25

Table 5. Tolerance of TIR and SWIR systems
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Table 5. Tolerance of TIR and SWIR systems
Tolerance TIR SWIR
x/y decentered tolerance /mm 0.02 0.02
x/y tilt tolerance /（″） 36 36
Thickness /mm 0.10 0.02
Radius /fringe 3 3

Table 6. Monte-Carlo tolerance analysis results
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Table 6. Monte-Carlo tolerance analysis results
Probability /% Tolerance
VNIR SWIR TIR
90 0.751 0.726 0.390
50 0.860 0.812 0.433
10 0.911 0.860 0.454

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Haiwei Jiang, Xinhua Niu. Design of Integrated Cloud Detection Optical System from Visible to Terahertz Bands[J]. Acta Optica Sinica, 2023, 43(6): 0612008

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