Optical arrangement for temp. measurement - contains optically bistable element and state detector supplied by control signal from source

摘要

An optical arrangement for temp. measurement has an optically bistable element (2) as its temp. sensor with an associated device for determining its switching state. A light source (4) feeds an optical control signal (S) to the bistable optical element which passes through it at least once. A light receiver (6) detects the control signal (A) transmitted by the bistable optical element and an evaluation circuit (10) determines the switching state. The bistable element's input and output for the optical control signal can coincide. USE/ADVANTAGE - Optical measurement of temp. practically independent of losses in optical transmission path.