Most of the existing hyperspectral imagers can provide the image of insulators. Traditional optical elements such as prism and grating can only reflect the surface pollution in a certain period of time. In this paper, a new type of splitter, linear gradation filter, is proposed to replace the former grating and prism for splitting light. Compared with the traditional hyperspectral imaging system using prism or grating spectroscopy, the filter based hyperspectral camera has smaller volume, wider scanning range and higher spatial and spectral resolution.
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