Performance analysis of a portable imaging spectrometer using linear variable optical filter

摘要

In the present work we have designed an small-size portable imaging spectrometer using linear variable interference filter, with CCD imaging head as picture sensor, and micromove stage to bring along interference filter which scan across every pixel of CCD array. The difference column pixel in the picture which we get at every step is monocolour partial image under different wavelength, with the step by step, these column monocolour pixels change the wavelength. And finally we reassembled these images and get the whole monocolour image with different wavelength. The interval of sweep step length decided by the required spectrum resolution and the required wavelength interval of different pictures. The experiment demonstrated the resolution of this spectrometer is about 16nm. But that major reason of the limiting resolution is the band pass of the linear variable interference filter. The spatial resolution of the instrument ultimately decided by CCD and imaging lens. This spectrometer has some characters such as compact structure, higher spatial resolution, higher spectrum resolution, higher scan rate and so on.