Photometric parameter photoelectric measurement for material analysis - using light source with four or more closely spaced LEDs and photodetector relatively distant from source

摘要

The arrangement allows for the photoelectric measurement of a photomtric parameter varying with the passage of light through a transmissive medium and has a light source and photodetector arranged on a common optical axis. The light source (10) consists of several, pref. 4, light emitting diodes (16-19) or LEDs arranged essentially parallel to the optical axis. The separation of the LEDs is negligible w.r.t. the distance between the light source and photodetector (11). USE/ADVANTAGE - Esp. for analysing material contents of specimen with increased accuracy using simple compact arrangement.