OPTICAL ELECTRONIC DEVICE FOR REMOTE DETECTION OF CONCEALED VIDEO SURVEILLANCE SYSTEMS Russian patent published in 2007 - IPC G02B23/12 G01S17/88 

FIELD: electronics, optics.

SUBSTANCE: the device comprises transmitting and receiving channels, a multiplexer, frame memory device, image subtracter, threshold device, synchronization system and a monitor, and also features an analog-digital converter, spatial selector made with possible setting of signal level from extensive objects, dimensions of which exceed given dimensions, to zero, and with possible setting of signal level from objects, dimensions of which do not exceed given, to maximally possible signal level, and a 3-channel digital-analog converter. First output of multiplexer is connected to input of frame memory device, second one - to first input of image subtracter, second input of which is connected to frame memory device. Output of synchronization system is connected to first input of multiplexer, to input of electronic block for powering source of illumination radiation of transmitting channel and accumulation register of charge-coupled matrix of receiving channel, video output of which is connected to input of analog-digital converter, output of which is connected to second input of multiplexer. Input of spatial selector is connected to output of image subtracter, and output - to input of threshold device. Three inputs of 3-channel digital-analog converter are connected to output of frame memory device, and one of digital-analog converter inputs is additionally connected to output of threshold device, while each one of three outputs of 3-channel digital-analog converter is connected to one of RGB inputs of monitor.

EFFECT: increased range of detection of concealed video surveillance systems, including those with light return coefficient of 10^-4 m²/srad order.

2 cl, 8 dwg