METHOD AND ARRANGEMENT FOR OPTICALLY DETECTING THE POSITION OF A MOVEABLE MIRROR

摘要

The invention relates to a method for optically detecting the position of a moveable test object (10), especially a mirror or reflector. A measuring bea m (6) that is produced by means of a light source (2) is reflected by the test object (10) and reaches a position-sensitive light detector (12) which carri es out a conversion into information corresponding to the position of the test object (10). The aim of the invention is to improve said method in such a wa y that the position of mirrors, especially rotating mirrors, can be quickly an d optically measured, whereby the optical construction is simple. The measurin g beam (6) is focussed onto the light detector (12) by means of an optical system (8). A signal matching the centre of gravity or the maximum (Is) of t he intensity distribution of the focussed measuring spot is determined on the basis of the measured values obtained by means of the light detector (12).