Fabricating Tolerance of Curved Prisms in Hyperspectral Spectrometer

Donghao Cai; Yacan Li; Lidong Wei; Lei Feng; Jinsong Zhou; Juanjuan Jing

doi:10.3788/AOS202141.0608001

Acta Optica Sinica, Volume. 41, Issue 6, 0608001(2021)

Fabricating Tolerance of Curved Prisms in Hyperspectral Spectrometer

Donghao Cai^1,2, Yacan Li¹, Lidong Wei¹, Lei Feng¹, Jinsong Zhou^1,2, and Juanjuan Jing^1,2、*

¹Key Laboratory of Computational Optical Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

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

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Figures & Tables(10)

Fig. 1. Schemaitc of spectral smile and keystone

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Fig. 2. Geometrical structures of curved prism. (a) Cross-section in Y direction; (b) cross-section in X direction

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Fig. 3. Schematic of fabricating error terms of typical curved prism. (a) Fabricating distance error; (b) fabricating tilt error

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Fig. 4. Keystone curves for different fabricating errors

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Fig. 5. Optical structure of two-curved-prism-based imaging spectrometer

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Fig. 6. MTF curves for different wavelengths. (a) 420 nm; (b) 633 nm; (c) 1000 nm

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Fig. 7. Spectral distortions of system under ideal fabricating conditions. (a) Spectral smile curves for different wavelengths; (b) keystone curves for different object heights

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Fig. 8. Curves of spectral smile, keystone and MTF under single fabricating term

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Table 1. Tolerance limit as well as spectral smile and MTF of single fabricating error term at system keystone of 0.2 pixel

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Table 1. Tolerance limit as well as spectral smile and MTF of single fabricating error term at system keystone of 0.2 pixel

Fabricatingerror term	Tolerancevalue	Smile@400 nm /pixel	Smile@632.8 nm /pixel	Smile@1000 nm /pixel	MTF@632.8 nmand 32 lp·mm^-1
Design value		0.004	0.065	0.084	0.807
D_X	0.19 mm	0.119	0.200	0.944	0.762
	-0.25 mm	0.255	0.309	0.321	0.726
D_Y	0.50 mm	0.02	0.08	0.100	0.36
	-0.10 mm	0.04	0.327	0.055	0.325
T_X	1.08°	0.893	0.734	0.676	0.0374
	-0.32°	0.231	0.277	0.287	0.124
T_Y	0.07°	0.299	0.348	0.358	0.693
	-0.07°	0.306	0.217	0.188	0.694
T_Z	0.05°	0.851	0.917	0.936	0.810
	-0.05°	0.858	0.786	0.765	0.810

Table 2. Final tolerance limit as well as system MTF of single fabricating error term

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Table 2. Final tolerance limit as well as system MTF of single fabricating error term

Fabricatingerror term	Tolerance limitvalue	MTF value atcentral FOV	MTF value atedge of positive FOV	MTF value at edgeof negative FOV
Standard	0	0.807	0.780	0.780
D_X	0.19 mm	0.762	0.720	0.750
	-0.20 mm	0.726	0.721	0.684
D_Y	0.10 mm	0.749	0.75	0.765
	-0.09 mm	0.848	0.780	0.780
T_X	0.03°	0.737	0.761	0.761
	-0.03°	0.855	0.775	0.775
T_Y	0.06°	0.723	0.725	0.685
	-0.06°	0.724	0.685	0.725
T_Z	0.05°	0.811	0.783	0.780
	-0.05°	0.810	0.780	0.783

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Donghao Cai, Yacan Li, Lidong Wei, Lei Feng, Jinsong Zhou, Juanjuan Jing. Fabricating Tolerance of Curved Prisms in Hyperspectral Spectrometer[J]. Acta Optica Sinica, 2021, 41(6): 0608001

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Paper Information

Category: Geometric Optics

Received: Sep. 21, 2020

Accepted: Nov. 5, 2020

Published Online: Apr. 7, 2021

The Author Email: Jing Juanjuan (jingjj@aoe.ac.cn)

DOI:10.3788/AOS202141.0608001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology