Smart hyperspectral imaging detection based on electrically tunable liquid-crystal Fabry-Perot microstructure array

Abstract

A smart spectral imaging detection method based on the integration of electrically tunable liquid-crystal(LC) Fabry-Perot(FP) microstructure array is proposed. It has very broad application in many fields with advantages of low cost, highly compact integration and working without mechanical part. The device can get hundreds of spectral bands simultaneously in one frame of picture in theory. This paper proposes the structure of smart spectral imaging array device, and analyses some key issues of liquid crystal Fabry-Perot structures for imaging application and calibration. Prototypes of 4 × 4 LC-FP array with the cavity thickness ranging from 4 to 20 µm for the working wavelength in the range of 800∼900nm, are made by lithography and wet etching. Test is carried out and analysed.

A High Throughput Tunable Filter Module for Multispectral Imaging

“…Relying on various active materials, plenty of narrowband tunable filters have been proposed to work as compact spectrometers or spectral imagers. [ 16–18 ] Although with high spectral resolution, the input optical power can be dramatically decreased by this spectral scanning approach. Considering an ideal tunable filter with 10‐nm bandwidth and unity transmittance, over 90% of power in the visible band can be blocked and wasted.…”