165856 ⎘
Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors
Sub-classes:SYSTEM FOR TESTING LIGHT SOURCES
#2Bio illuminance measuring device for determining circadian action
#3Laser projection system
#4Multiple light source output smoothing
#5Controlling ultraviolet intensity over a surface of a light sensitive object
#6Method and apparatus for image scanning
#7Spectrally Controlled Illuminator and Method of Use Thereof
#8Measurement method of the current-voltage characteristics of photovoltaic device, a solar simulator for the measurement, and a module for setting irradiance and a part for adjusting irradiance used for the solar simulator
#9Photo reflector including a light-emitting element and a light-receiving element
#10Measurement method of the current-voltage characteristics of photovoltaic devices, a solar simulator for the measurement, and a module for setting irradiance and a part for adjusting irradiance used for the solar simulator
#11Simplified system and method for compensated laser beam propagation
#12System and method for low signal knife edge wavefront sensing in an adaptive optical system