| CPC G01J 3/2823 (2013.01) [G01J 3/14 (2013.01); G01J 3/18 (2013.01); G01J 2003/2826 (2013.01)] | 19 Claims |
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1. A hyperspectral imaging device comprising:
an optical channel arranged to focus incident light at a first image plane to form an image at the first image plane;
a spectrometer comprising:
a slit formed in an optical stop at the first image plane to allow a slit-shaped portion of the incident light pass through;
a dispersive element constructed and arranged to receive incident light from the slit and spectrally disperse it along a direction perpendicular to a width of the slit;
a focusing lens arranged to focus the spectrally dispersed light at a second image plane such that the spectral dispersion is imaged along a first axis of the second image plane, and a spatial image of the slit width is imaged along a second axis of the image plane; and
a focal plane array sensor at the second image plane operable to detect the spectrally dispersed light; and
a sliding lens group arranged between the optical channel and the first image plane and adapted to move linearly in a direction perpendicular to an optical axis of the imaging channel and perpendicular to a length of the slit, to direct the incident light in a varying offset position thereby scanning the entire image over the slit such that multiple frames acquired time sequentially by the focal plane array sensor each correspond to a horizontal line of the image.
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