Reference laser beam sampling apparatus

Resonant subcavity differential spectrophone

Self-referencing remote optical probe

Simple, low cost, laser absorption sensor system

Smoke opacity meter

Spectrometer for conducting turbidimetric and colormetric measur

Spectrometer normalization system

Spectrophotometric method and spectrophotometer for performing t

Sperm densimeter

Suspended solids meter

System and method of detecting entangled photons

System for transmission loss comparison

Transmissometer and optical elements therefor

Vertical-beam photometer for determination of light...

Wavelength-modulation spectroscopy method and apparatus