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Liangliang Li

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Proceedings Article | 29 December 2023 Paper

Research on optical slit setting technique of off-axis triple reflection imaging spectrometer

Quan Zhang, Liangliang Li

Proceedings Volume 12976, 129761S (2023) https://doi.org/10.1117/12.3009488

KEYWORDS: Spectroscopy, Imaging systems, Monochromatic aberrations, Reflection

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Research of imaging spectrometer is of great significance to improve the applicability and accuracy of the alternative calibration of remote sensor in orbit. According to the requirements of the imaging spectrometer, the structure of the imaging spectrometer is presented by combining the off-axis three-trans front optical system and the beam splitting system based on the convex grating. The design of the optical system of the imaging spectrometer with compact structure, small volume, high spectral resolution and good imaging quality is realized by the combination of the two, which meets the design requirements of the imaging spectrometer optical system. The operating band of the optical system covers 400 ~ 1000nm, the F-number is 3.3, the field of view is 11°. In order to verify whether the imaging spectrometer meets the design specifications, it is necessary to carry out laboratory assembly and testing of the instrument. Due to the influence of processing technology, there will be some processing errors in the processing of mechanical structures and optical components. In order to make the installation of each component as close to the ideal position as possible, reduce the influence of optical path offset on the optical system, and enable the detector to accurately detect the spectral information of the target, it is necessary to install and debug the spectrometer system to ensure the measurement accuracy of the instrument. According to the test results, the installation state of the optical slit and off-axis triple reaction system is continuously optimized until the best state is achieved. This research provides the technical support for the development of imaging spectrometer, and lays a foundation for the on-orbit radiometric calibration of remote sensor based on imaging spectrometer.

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