Optical measuring system with light source and photodetector

摘要

The system has its measuring sensor provided with a reflector in the region of the object being measured to reflect light (1,2) from the light source (LQ). The light is reflected between the outlet (3) and the inlet (3) at the sensor at the reflector and at the object.The reflector is positioned so that the first reflection at the object and a second reflection at the reflector and a third reflection at the object if the reflected light is not required to return into the optical fibre