Dr. Lian Xiang Profile

Dr. Lian Xiang

President at GratingWorks USA

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Proceedings Article | 21 September 1998 Paper

Hyperspectral imaging sensor for the coastal environment

John Fisher, John Antoniades, Chris Rollins, LianQin Xiang

Proceedings Volume 3482, (1998) https://doi.org/10.1117/12.322003

KEYWORDS: Spectrographs, Telescopes, Space telescopes, Mirrors, Short wave infrared radiation, Distortion, Sensors, Holography, Diffraction gratings, Monochromatic aberrations

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Recent advances in large format detector arrays and holographic diffraction gratings have made possible the development of imaging spectrographs with high sensitivity and resolution, ideally suited for space-based remote sensing of earth resources. An optical system composed of dual spectrographs and a common fore-optic has been designed for the visible-near infrared (VNIR) and shortwave bands with 10-nm spectral resolution, providing 30-meter ground resolution from an altitude of 605 km. The spectrograph designs are based on a modified Offner 1-X relay with spherical mirrors and a convex spherical holographic grating for the secondary mirror. The fore-optic is a three-mirror anastigmatic telescope with a 360-mm focal length to match the pixel pitch of the respective 1024 X 1024 visible silicon CCD and SWIR HgCdTe FPAs. The primary advantages of this design are the relatively low f-number (f/3), large flat field (18 mm), and low distortion. Preliminary performance results of a VNIR testbed grating and spectrograph are presented and compared to the design predictions.

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