| 摘要 |
FIELD: physics.SUBSTANCE: device for detecting use of a laser acoustic location system for unauthorised pickup of speech information has a lens 1, the optical input of which is the input of the device, a tunable optical filter 2, series-connected photodetector 3, amplifier 4, control unit 5, the first output of which is the output of the device, and a device 6 for controlling the tunable optical filter, the output of which is connected to the control input of the tunable optical filter, as well as a power supply unit 7, the output of which is connected to power inputs of the photodetector 3, amplifier 4, control unit 5 and device 6 for controlling the tunable optical filter.EFFECT: timely detection of use of a laser acoustic location system for unauthorised pickup of speech information.1 dwg |
