VORRICHTUNG FUER EINEN INFRAROT-BEWEGUNGSMELDER ZUR VARIABILITAET SEINES ERFASSUNGSWINKELS

摘要

The device comprises a shutter 4 having an opening 5 which adapts the angular coverage to the particular monitoring situation. To this end the shutter 4 is secured within the entrance window (3, Fig. 1) which transmits heat radiation into the apparatus. Various segments 6, 7 can be inserted into the shutter opening to further reduce the angular coverage by various amounts. The window may be formed in a hemispherical casing and the shutter 4 may have matching curvature. <IMAGE>