NASA NTRS · 19760000333
Pinhole diffraction filter
Abstract
Multistage diffraction filter consisting of coalined series of pinholes on parallel sheets can be used as nondegradable UV filter. Beam is attenuated as each pinhole diffracts radiation in controlled manner into divergent beam, and following pinhole accepts only small part of that beam.
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Woodgate, B. E.. 1977-01-01. Pinhole diffraction filter. https://ntrs.nasa.gov/citations/19760000333
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