Laser monitoring device and system of monitoring equipment

Abstract

The invention discloses a laser monitoring device and system of monitoring equipment.The laser monitoring device and system comprise a semiconductor laser transmitter, a laser monitoring eavesdropping transmitting device, a laser beam expanding optical system, a laser transmitting system, a closed box, a sound collection device, a common infrared eavesdropping transmitting device, a laser detector, a noise reduction processing system, an audio output end, an audio modulation amplifier, a pre-amplifier, an infrared receiver, an infrared modulation transmitting system and an amplification noise processer.The laser monitoring device and system have the advantages that the device integrates the advantages of the contact type eavesdropping technology in a short-distance complex environment and the advantages of laser eavesdropping under a long-distance non-contact condition, and the device switches between the two eavesdropping modes freely according to different conditions.The device integrates common infrared and laser infrared as transmission media, thereby the eavesdropping distance can reach one kilometer, the device can be adapted to the contact situation as well as the non-contact situation, high practicability is achieved, the inner structure of the system is stable in connection, and the laser monitoring device and system are suitable for being used for criminal investigation and criminal case cracking equipment.

Description

technical field [0001] The invention relates to a laser eavesdropping device, in particular to a laser eavesdropping device and system of eavesdropping equipment, and belongs to the field of acousto-optic technology. Background technique [0002] There are many forms of monitoring. From the initial installation of professional monitoring equipment to the establishment of pseudo base stations for wireless mobile phone monitoring, it has gone through a long process. Nowadays, the use of monitoring technology is quite common. For example, in a war, in order to know the content of the communication between the enemy, wires are often connected to the enemy's communication line for eavesdropping, so as to grasp the initiative of the war. In the investigation of the current case, the security personnel put the miniature wireless microphone in the places where the suspects often haunt, monitor their conversations, and obtain conclusive evidence. The monitoring requirements are quit...

AI Technical Summary

Problems solved by technology

Some of the current monitoring devices have some shortcomings. When monitoring, they often need to be touched to perform monitoring work. The scope of use of monitoring is small and the work efficiency is low.

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