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Development of a New Multispectral Imaging System Consisting of a Liquid Crystal Tunable Filter

出版	Universitat Politècnica de Catalunya. Escola Tècnica Superior d'Enginyeria de Telecomunicació de Barcelona. Departament d'Òptica i Optometria, 2013 (Master in Photonics), 2013
URL	http://books.google.com.hk/books?id=NeANywEACAAJ&hl=&source=gbs_api

註釋[ANGLÈS] The aim of this study was to develop a new portable multispectral system basically composed of a monochrome digital camera, a liquid crystal tunable filter (LCTF) and a laptop. The system had a high spatial resolution (pixels of the camera) as well as a high spectral resolution, which was determined by the number of available spectral bands (from 400 to 720 nm with a 10-nm step). The software to control the system was developed, and its physical properties, especially the transmission of the spectral bands and the spatial uniformity, were characterized. Furthermore, the optimal objective lens was selected according to the desired requirements (field of view, angle-of-acceptance etc.). Using the developed setup, multispectral images of several scenes were captured and the spectral radiance and reflectance on any pixel were computed. This novel system is a good alternative to conventional spectrophotometers when high spatial resolution is required, nevertheless some arrangements are still needed to improve its performance.