Faster narrowband multi-spectral liquid crystal-based imaging modules tailored to the specific application

Abstract

The most common configuration of liquid crystal devices incorporated within spectral imaging systems is using LCTFs. Usually, these filters suffer from low light throughput or slow response times which may not meet the growing demands of industry and research. However, in most applications multispectral imaging is adequate, and no need for hyperspectral imaging. In this work, we implemented a discrete tunable Lyot-based filter in such systems to obtain spectral images more efficiently. The filter consists of 3 LC cells combined with 9 narrow bands of passive filter covering the VIS and NIR, which makes it a potential candidate for various applications. A system with a smaller number of bands designed for oximetry imaging is even faster and shows higher light throughput. Experimental results show that our system holds a relatively faster response time with high light throughput while providing reliable spectral information.