Angular position measuring method for oscillating mirror in IR sight - using code plate between source and detector and aperture plate immediately in front of detector defining slit of single code width

摘要

The position measuring method provides the precise angular position of the electromagnetically oscillated mirror (1) with an electric servo motor connected in a closed regulation loop, via a code plate (4) lying in the light path between a source (2) and a detector (3). The code plate provides a code signal identifying each angular position of the mirror, interrogated by a measuring device. Pref. an aperture slit (5) is provided by an aperture plate (6) immediately in front of the detector, at which a moving image of the code plate is obtained, the code signal interrogated at the time points for which a single code is obtained within the aperture slit. USE/ADVANTAGE - For providing high accuracy position and/or trigger signal, for all applications, without time delay.