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Proceedings Paper

Design and test of a near-infrared tunable liquid crystal birefringent filter
Author(s): Zhi-Xue Shen; Jian-feng Li; Da-Yong Zhang; Yan Long; Li-xian Huang; Yong-quan Luo; Hai-Tao Liu
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Paper Abstract

A near infrared tunable liquid crystal birefringent filter is developed by cascading a series of optical elements including the wide range wire-grid polarizers, the nematic liquid crystal retarders and the quartz retarders. The center wavelength of the filter's bandpass could be randomly selected or scanned in the designed spectral range with almost exactly the same out-of-band suppression by harmoniously adjusting the driving signals. The tuning range of the filter is 900nm~1700m, the clear aperture is over 50mm, and the bandwidth FWHM is about 15nm @900nm.The filter provides more flexible functions such as random wavelength selection and arbitrary spectral scanning step. Due to the excellent imaging quality and the relatively wide angle-of-acceptance with a large aperture, the filter enable snapshot spectral imaging sensors and compact systems without any moving parts, which is of great use in a wide variety of applications such as remote sensing for environmental monitoring, agriculture census, and mineral resources detection.

Paper Details

Date Published: 7 October 2014
PDF: 8 pages
Proc. SPIE 9241, Sensors, Systems, and Next-Generation Satellites XVIII, 92411Z (7 October 2014); doi: 10.1117/12.2067341
Show Author Affiliations
Zhi-Xue Shen, China Academy of Engineering Physics (China)
Jian-feng Li, China Academy of Engineering Physics (China)
Da-Yong Zhang, China Academy of Engineering Physics (China)
Yan Long, China Academy of Engineering Physics (China)
Li-xian Huang, China Academy of Engineering Physics (China)
Yong-quan Luo, China Academy of Engineering Physics (China)
Hai-Tao Liu, China Academy of Engineering Physics (China)


Published in SPIE Proceedings Vol. 9241:
Sensors, Systems, and Next-Generation Satellites XVIII
Roland Meynart; Steven P. Neeck; Haruhisa Shimoda, Editor(s)

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