Distortion measurement of push-broom imaging spectrometer

Yuheng Chen; Yiqun Ji; Jiankang Zhou; Xinhua Chen; XiaoXiao Wei; Weimin Shen

doi:10.1117/12.837677

30 November 2009 Distortion measurement of push-broom imaging spectrometer

Yuheng Chen, Yiqun Ji, Jiankang Zhou, Xinhua Chen, XiaoXiao Wei, Weimin Shen

Proceedings Volume 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 750621 (2009) https://doi.org/10.1117/12.837677
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

The requirement for low distortion in either spatial or spectral direction of a push-broom imaging spectrometer has been recently recognized. Though distortion scale of as much as 1 or 2 pixels have been accepted in previous spectrometer designs, it is suggested to be limited to the order of hundredth of a pixel to preserve the validity and integrity of the spectral imaging data. The developed push-broom imaging spectrometer adopts a reflective Offner relay structure and provides good optical correction and compact size. The spectral and spatial distortion measurement is of significance for instrument performance evaluation and alignment guidance. In this paper, two easy-to-implement and effective measurement methods for both spatial and spectral distortion are presented. By using a standard Hg-Cd lamp as both the illuminating source and the object, the spectroscopic image of the slit focusing onto the CCD focal plane is collected. In certain rows of the image, the center positions of every spectral line are recorded. Through the comparison of recorded positions of different rows, the spectral line bending of the calibrated imaging spectrometer is worked out. In the continuous spectrum illumination condition and by using a self-made mask as the object, the entrance slit image is cut into tens of tiny rows that correspond to different image heights. The center positions of 5 typical rows are calculated and five chromatic distortion curves are worked out with certain interpolation method.

Citation Download Citation

Yuheng Chen, Yiqun Ji, Jiankang Zhou, Xinhua Chen, XiaoXiao Wei, and Weimin Shen "Distortion measurement of push-broom imaging spectrometer", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 750621 (30 November 2009); https://doi.org/10.1117/12.837677

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KEYWORDS

Distortion

Spectroscopy

Colorimetry

Lamps

Imaging spectroscopy

Mirrors

Reflectivity

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