Optical Design of Ocean Color Imaging Spectrometer Based on Offner-Like Configuration

Lingling Song; Xinhua Chen; Qiao Pan; Weimin Shen

doi:10.3788/AOS241213

Acta Optica Sinica, Volume. 44, Issue 24, 2422002(2024)

Optical Design of Ocean Color Imaging Spectrometer Based on Offner-Like Configuration

Lingling Song^1,2,3, Xinhua Chen^1,2,3、*, Qiao Pan^1,2,3, and Weimin Shen^1,2,3

Author Affiliations

¹School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, Jiangsu , China

²Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province, Suzhou 215006, Jiangsu , China

³Key Laboratory of Modern Optical Technologies of Education Ministry of China, Suzhou 215006, Jiangsu , China

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Figures & Tables(13)

Fig. 1. Slit splicing diagram

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Fig. 2. Optical layout of Offner-like spectral imaging module

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Fig. 3. Optical layout of fore-optics

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Fig. 4. MTF curves and spot diagrams of the fore-optics. (a) MTF curves; (b) spot diagrams

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Fig. 5. Optical layout of Offner-like spectral imaging module after optimization. (a) No folding mirror; (b) after folding mirror is added

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Fig. 6. MTF curves and spot diagrams of Offner-like spectral imaging module after optimization. (a) MTF curves; (b) spot diagrams

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Fig. 7. Optical layout of imaging spectrometer based on Offner-like spectral imaging module

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Fig. 8. MTF curves and spot diagrams of imaging spectrometer based on Offner-like spectral imaging module. (a) MTF curves; (b) spot diagrams

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Fig. 9. Optical layout of imaging spectrometer based on Offner spectral imaging module

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Table 1. Index parameters of imaging spectrometer
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Table 1. Index parameters of imaging spectrometer
Parameter Value
Orbital altitude /km 417
Swath /km 140
Wavelength band /μm 0.4‒0.9
Spectral resolution /nm 5
Pixel size /（μm×μm） 17×34
GSD /m 20
Image space F# 3

Table 2. Specifications of imaging spectrometer
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Table 2. Specifications of imaging spectrometer
Specification Value
Focal length of fore-optics /mm 590.75
F# of fore-optics 5
Image space F# 3
Total slit length /mm 198.33
Each slit length /mm 99.66
Slit width /μm 56.67
Spectral image size /mm 3.40

Table 3. Smile and keystone of Offner-like spectral imaging module
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Table 3. Smile and keystone of Offner-like spectral imaging module
Wavelength /μm Smile /μm Normalized field of view Keystone /μm
0.40 1.09 －1.0 1.50
0.55 1.20 －0.7 1.10
0.65 1.28 0 0
0.75 1.36 0.7 1.10
0.90 1.50 1.0 1.50

Table 4. Comparison of performance parameters of two imaging spectrometers

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Table 4. Comparison of performance parameters of two imaging spectrometers

Performance parameter		Design result with Offner-like structure		Design result with Offner structure
Size /（mm×mm×mm）		350×560×840		480×730×580
Spot RMS radius /μm		<3.74		<5.38
MTF		>0.80		>0.70
Fore-optics	Surface type	Even asphere		Even asphere
	Maximum aspheric gradient	M1	3.47×10^－3	M1	3.92×10^－4
		M2	1.98×10^－6	M2	5.74×10^－5
		M3	5.16×10^－4	M3	5.32×10^－3
Spectral imaging module	Mirror type	Zernike freeform		Zernike freeform
	Maximum surface sag gradient	M1	2.62×10^－3	M1	0.45
	Maximum surface sag gradient	M3	1.85×10^－3	M3	0.21

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Lingling Song, Xinhua Chen, Qiao Pan, Weimin Shen. Optical Design of Ocean Color Imaging Spectrometer Based on Offner-Like Configuration[J]. Acta Optica Sinica, 2024, 44(24): 2422002

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