Apparatus for and method of testing direct-view image intensifie

Calibration system for a photo multiplier tube

Construction unit for two beam photometers

Device for detecting the wetting of a pane

External calibration system for a photo multiplier tube

Laser energy measuring unit and laser machining apparatus

Light measuring apparatus and a method for correcting...

Light measuring apparatus and light measuring method

Light sensing device

Light source for illumination in an optical viewing device

Low-level lighting comparator

Magnetic stirrer noise cancellation system

Method and apparatus for compensating illuminance error of a lig

Method of accelerated testing of illuminated device components

Method of accelerated testing of illuminated device components

Method of and assembly for measuring equivalent sphere illuminat

Photographic method for monitoring visibility through measuremen

Storage circuit for photometer

System and method for discriminating between direct and reflecte

System for calibration of optical instrument on satellite with r