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