Patent ID: 6100539
Filing Date: 2000-08-08
Classification: G01S

Abstract:
A light sensor comprising a light transmitter for transmitting a light signal (T.sub.x, T.sub.xd) into a region to be monitored; a light receiver for receiving a reflected light signal (R.sub.x) from an object present in the monitored region, at least one signal generator for producing a first signal (T.sub.x) to energize the light transmitter and also for producing a second signal (L.sub.0) standing in a defined phase relationship to the first signal (T.sub.x), but with a different signal shape in comparison to the first signal (T.sub.x), and also a correlator for producing a correlation function (KKF) between the reflected light signal (R.sub.x) and the second signal (L.sub.0) as well as an evaluation unit following the correlator for determining information related to the distance between the light sensor and the object.