A METHOD FOR THE DETERMINATION OF THE DISTANCE AND THE ANGULAR POSITION OF AN OBJECT

摘要

A method of determining the distances and angular positions of stationary and moving objects (3), for example in an area to be monitored in connection with for instance swing doors. The determination is done by means of triangulation where light, which in the main part is collimated, is transmitted (1) into the area at different angles and in a certain sequence. The reflected light is correspondingly registered on a position-sensitive detector (5) which is positioned at a certain distance from the transmitter (1). The position (5a, 5b), where the reflected light falls on the detector (5), represents the distance, and the moment when the light is received represents the angular position of the detected object. The values are compared to stored reference values which change when the angle of the door's opening is changed.