A Dual-field-of-view (DFOV) lenses has been developed, which is for MWIR band with high ratio used by 3rd
generation thermal imager. The lenses change the field of view by flipping in or out a group of optical elements. The
lenses' ratio of DFOV is six, the focal length of narrow field is 240 millimeter, F-number is 4. As a result of smaller
pixel size, the lenses have to provide high image quality. It is folded to get smaller volume. Because the detector contains
cold stop and the lenses contains moveable group, narcissus is examined and minimized. Reference source is set at a
suitable position to correct non-uniform of detector. Field stop is set at the first image surface to minimize stray light.
The lenses improve thermal imager spatial resolution by micro-scanning which is realized by jiggling motion of the last
element at two directions.
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