A new improved design method of the panoramic annular lens (PAL) with aspheric surfaces is introduced. The structure
is not only helpful to enlarge the field of view (FOV) of the system, but also help to make a horizontal symmetric field of
view. The field of view reaches (-30°—+30°)x 360 and was distortion controlled to reduce blind zone in the center.
The field of view and distortion of PAL was investigated theoretically and method of aspheric surface design was also
discussed. An aspheric PAL and its relay lens group were designed. The total length was 20.4mm, and the focal length
was 0.3mm. To get bright and clear image, the aperture of the system was set to f/2.88, and the diameter was 16.6mm.
The spectral range was from 0.486~0.656um. The relay lens group was consisted of 8 pieces of lenses, with a back focal
length (BFL) of 2mm. MTF below 70 lp/mm of the system is above 0.5. The result shows that the aberrations are
corrected well.
In this paper, a fish-eye lens used for detecting rice canopy has been presented. This is a small lens with broad spectrum
detection. The lens is composed of two groups, with three changeable optical filters between them. The filters can be
changed automatically by stepper motor. All the data can be analyzed immediately by the laptop computer. The first
sample lens shows its good performance of image quality and portability for outdoor operation.
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