Patent ID: 6462561
Filing Date: 2002-10-08
Classification: G01N

Abstract:
For use in association with a sensing device which is capable of transmitting and receiving electromagnetic radiation for inspecting an object, said sensing device including a detector for producing a signal which is indicative of said electromagnetic radiation, apparatus comprising a distance-correction circuit which is adaptable to being in connection with said detector so that said distance-correction circuit adjusts said output voltage signal so as to account for variation in said output voltage signal due to variation in the distance of said sensing device from said object, wherein in the absence of said distance-correction circuit said detector produces a distance-dependent voltage output signal, said distance-dependent voltage output signal being variable in accordance with said distance, and wherein in combination with said distance-correction circuit said detector produces a distance-independent voltage output signal, said distance-independent voltage output signal being invariable in accordance with said distance.