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