radiant density
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- diatomic roto
- visible emissivity
- mode pattern
- time-averaged shadow-moire method
- optical head controllers,control ics/modules
- chronophotography
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- geometrical focus
- Varotal lens
- infra-red beam folower
- upper state relaxation
- holographic gratings
- frequency summing
- filters
- optical deformation
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- intensifying screen
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- metacrystalline
- astrospectrograph camera