GEAR DETERMINING POSITION OF LIGHT SPOT Russian patent published in 1997 - IPC

FIELD: instrumentation. SUBSTANCE: modulation of legitimate signal with insertion of high-frequency filter, synchronous detector and formation of feedback controlling position of equipotential surface of multiscan corresponding to center of light spot (signal) make it possible to get rid of influence of permanent and slowly changing exposures and to execute coordination of modulated signal in wide range of ratio of power of exposure to power of signal. EFFECT: increased accuracy of measurement under conditions of background exposure. 1 dwg