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