Research on imaging spectrometer using LC-based tunable filter

Zhixue Shen; Jianfeng Li; Lixian Huang; Fei Luo; Yongquan Luo; Dayong Zhang; Yan Long

doi:10.1117/12.928563

15 October 2012 Research on imaging spectrometer using LC-based tunable filter

Zhixue Shen, Jianfeng Li, Lixian Huang, Fei Luo, Yongquan Luo, Dayong Zhang, Yan Long

Proceedings Volume 8515, Imaging Spectrometry XVII; 85150H (2012) https://doi.org/10.1117/12.928563
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

A liquid crystal tunable filter (LCTF) with large aperture is developed using PDLC liquid crystal. A small scale imaging spectrometer is established based on this tunable filter. This spectrometer can continuously tuning, or random-access selection of any wavelength in the visible and near infrared (VNIR) band synchronized with the imaging processes. Notable characteristics of this spectrometer include the high flexibility control of its operating channels, the image cubes with high spatial resolution and spectral resolution and the strong ability of acclimation to environmental temperature. The image spatial resolution of each tuning channel is almost near the one of the same camera without the LCTF. The spectral resolution is about 20 nm at 550 nm. This spectrometer works normally under 0-50°C with a maximum power consumption of 10 Watts (with exclusion of the storage module). Due to the optimization of the electrode structure and the driving mode of the Liquid Crystal cell, the switch time between adjacent selected channels can be reduced to 20 ms or even shorter. Spectral imaging experiments in laboratory are accomplished to verify the performance of this spectrometer, which indicate that this compact imaging spectrometer works reliably, and functionally. Possible applications of this imaging spectrometer include medical science, protection of historical relics, criminal investigation, disaster monitoring and mineral detection by remote sensing.

Citation Download Citation

Zhixue Shen, Jianfeng Li, Lixian Huang, Fei Luo, Yongquan Luo, Dayong Zhang, and Yan Long "Research on imaging spectrometer using LC-based tunable filter", Proc. SPIE 8515, Imaging Spectrometry XVII, 85150H (15 October 2012); https://doi.org/10.1117/12.928563

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