Optical technique for background suppression

Optical waveguide sensor and measuring apparatus using said...

Optical-fiber refractometer

Optically amplified critical wavelength refractometer

Optimal length for refractive index sensors

Packaging or container with optical indicator

Particle analysis system with photochromic filter

Particle detecting system

Particle evaluator

Paste solids measurement in real time

Phase detector for optical figure sensing

Phase-coded control for ring laser gyro

Photodensitometer for measuring optical fringe patterns

Photoelectric smoke detector with means for adjusting the amount

Photographic color densitometer check plate

Photomask inspection by optical spatial filtering

Photometer

Photometric liquid analyzers for use in clinical or chemical lab

Photon-counting integrating nephelometer

Plant comparator