Laboratory radiometric calibration for the convex grating imaging spectrometer

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

doi:10.1117/12.2069732

18 September 2014 Laboratory radiometric calibration for the convex grating imaging spectrometer

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

Proceedings Volume 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 92822G (2014) https://doi.org/10.1117/12.2069732
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

The radiometric calibration of imaging spectrometer plays an import role for scientific application of spectral data. The radiometric calibration accuracy is influenced by many factors, such as the stability and uniformity of light source, the transfer precision of radiation standard and so on. But the deviation from the linear response mode and the polarization effect of the imaging spectrometer are always neglected. In this paper, the linear radiometric calibration model is constructed and the radiometric linear response capacity is test by adjusting electric gain, exposure time and radiance level. The linear polarizer and the sine function fitting algorithm are utilized to measure polarization effect. The integrating sphere calibration system is constructed in our Lab and its spectral radiance is calibrated by a well-characterized and extremely stable NIST traceable transfer spectroradiometer. Our manufactured convex grating imaging spectrometer is relative and absolute calibrated based on the integrating sphere calibration system. The relative radiometric calibration data is used to remove or reduce the radiometric response non-uniformity every pixel of imaging spectrometer while the absolute radiometric calibration is used to construct the relationship between the physical radiant of the scene and the digital number of the image. The calibration coefficients are acquired at ten radiance levels. The diffraction noise in the images can be corrected by the calibration coefficients and the uniform radiance image can be got. The calibration result shows that our manufactured imaging spectrometer with convex grating has 3.0% degree of polarization and the uncertainties of the relative and absolute radiometric calibrations are 2.4% and 5.6% respectively.

Citation Download Citation

Jiankang Zhou, Xinhua Chen, Yuheng Chen, Yiqun Ji, and Weimin Shen "Laboratory radiometric calibration for the convex grating imaging spectrometer", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 92822G (18 September 2014); https://doi.org/10.1117/12.2069732

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KEYWORDS

Calibration

Spectroscopy

Polarization

Integrating spheres

Imaging systems

Sensors

Spectral calibration

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