| 摘要 |
An infrared blurring array is formed of a substrate having thereon a surface array of blurlets whose foci vary in distance from a nominal focal surface location, and/or whose optical phases at the nominal focal surface location vary, in a pseudorandom but deterministic manner. The substrate may be made of a material transmissive to a waveband of incident infrared energy, and the blurlets are refractive lenslets in the substrate, or the blurlets may be mirrorlets in a reflective substrate. The blurlets are surfaces each defined by a curvature and an axial offset from a nominal focal surface location. At least one, and preferably both, of the curvature and the axial offset of each blurlet is a value that is randomly selected from a set of values defined by a respective distribution, preferably a truncated distribution.
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