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.
Pinhole diffraction filter
NASA Tech Briefs ; 1 , 3
1977-01-01
Miscellaneous
No indication
English
Pinhole-Coronograph Tracking Control
NTIS | 1981
|Combustion Pinhole-Camera System
NTIS | 1982
|Pinhole-coronograph tracking control
NTRS | 1981
|NTRS | 1978
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