Analysis on the shape distortion of optically readable infrared focal plane array

The defects of FPA unit were measured. The effect of shape distortions FPA are analyzed, including the reflecting direction dispersion among units and bending of reflecting surface of a unit. The distortion limits for perfect detection were given. Though there were obvious shape distortions, IR image of objects about 500 K was obtained. And the sensitivity may lie not only on the cliff-edge optical filtering, but also the light spot moving effect if the image of one FPA unit occupies a few CCD pixels. It means that a unit's imaging area on the image plane may not be illuminated equivalently but have a light spot within its boundary if its reflecting part is not flat. Experimental results are given to testify the light spot moving effect.