One of the most vulnerable issues in the technical protection of information is the receipt of data, private or confidential, due to leakage through the optoelectronic channel, the main source of data is laser acoustic intelligence systems or laser microphones. There are active and passive methods of protection against laser acoustic reconnaissance systems (ACS). Active methods use various noisy or vibrating devices that pose a danger to human health. With passive protection, it is recommended to use either special corrugated windows or completely closed shutters, which create some inconvenience now. Detecting a working laser microphone is very difficult and in some cases technically impossible. For example, the removal of information using ACS occurs through glass building structures, usually windows. This article is devoted to the analysis of the principle of operation of laser systems of acoustic intelligence and passive methods of reading acoustic information. Triangulation laser sensors are designed for non-contact measurement and control of position, movement, size, surface profile, deformation, vibration, sorting, recognition of technological objects, measuring the level of
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