Optical measuring device with means for suppressing reflections

摘要

The present invention relates to an optical measuring device for measuring physical quantities, comprising a measuring transducer and an evaluating electronic unit, interconnected by a light-transmitting system and photo-optic devices for coupling in light from a light source to the system, and for coupling out light from the system to photo-detector devices in the electronic unit. The measuring device comprises a first element for polarizing the light from the light source and a second element for polarizing the light to the photo-detector devices, the difference in the direction of polarization between the two polarizing elements being chosen so that light reflections in the system in and adjacent to the evaluating electronic unit are substantially blocked from the photo-detector devices by the second polarizing element.