Image multispectral sensing

Details Image multispectral sensing Image multispectral sensing

G - Physics

01

J

G01J 3/50 (2006.01) G01J 3/28 (2006.01) G01S 17/88 (2006.01)

Patent

CA 2152914

A spectrophotometer useful for spectral analysis of light emanating from one or more targets (37) within an image. The apparatus comprises a diffractive lens (13) having an optical axis, a planar array of photodetector elements (pixel's) (32), a means for changing the distance between the photodetector array (32) and the diffractive lens (31) along the optical axis and a signal processor (34). If either the array (32) or lens (31) is moved along the optical axis, different wavelengths of light from each target within the image come into or out of focus on particular photodetector elements in the plane of array (32) generating sequential images corresponding to different wavelengths. By tracking each pixel's output in the array as a function of lens position relative to the array, the spectral composition of each target within the image is generated.

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