Blur film assembly for infrared optical applications

摘要

A blur film (40) is made of a polymeric film material transmissive to infrared energy of a selected waveband, which is affixed to a surface of a substate (42) transmissive to energy of the same selected infrared waveband. The blur film (40) has a texture or a plurality of lenslets (44) thereon, where the surface of each lenslet (44) is a surface of revolution. In a spatial-filter wheel (32) application, the blur film (40) and substrate (42) are affixed to a support, which in turn is rotatably mounted on a drive (34). The support is structured such that a portion of its circumference is covered by the blur film (40) and a portion of its circumference is not covered by the blur film (40). The spatial-filter wheel (32) is rotated in front of a detector (26) to produce alternating blurred and direct images on the detector (26).