LASER DOSIMETER WITH AUTOMATIC COMPENSATION OF BACKGROUND LIGHT Russian patent published in 1995 - IPC

FIELD: optical engineering. SUBSTANCE: laser dosimeter has photodetector 1, bias voltage source 2, integrating RC-circuit 3, voltage amplifier 4, memory unit 5, which has the first comparator 6, memory switch 7, memorizing capacitor 8, the first voltage follower 9, registrar 10. The first rejection switch 11, compensate voltage source 12, compensation switch 13, the third integrating circuit 14, the second voltage follower 15, the second rejection switch 16, the second integrating Rc-circuit 17, the second comparator 18, differentiating RC-circuit 19, one-shot multivibrator 20 are brought into the device newly. The first integrating RC-circuit 21 is brought into memory unit together with corresponding couplings. EFFECT: improved efficiency of operation. 1 dwg