The optical fiber vibration detection system is easy to install, the sensing unit is not charged, intrinsically safe, and easy to maintain. It is increasingly favored by people. It is mostly used in perimeter anti-intrusion detection such as oil and gas storage depots, ammunition depots, airports, and prisons.
　　The optical fiber vibration sensing system uses optical cables as the vibration sensing unit and is laid on the fence (buried in the wall or buried in the ground). When someone climbs the fence, the vibration of the fence will be captured by the vibration sensing fiber and trigger an alarm .
　　The core R&D personnel of our company have been engaged in the research and development of vibrating optical fiber perimeter security system for many years. They are familiar with the effect of various natural vibration signals on the sensing light signal (phase, amplitude, polarization state, radiation state, scattering state) in the vibrating fiber, and rely on a large number of On-site test database and modern high-speed digital processing system, we invented a new generation of optical fiber vibration detection system, which can monitor external vibration signals in real time, and can intuitively display external vibration waveform contours, especially impulse signal waveforms, which is very convenient for engineering sites Debugging can effectively avoid system false alarms caused by natural behaviors such as wind, rain, and birds by simply setting the impact frequency of the intensity threshold, thereby simplifying the usual wind and rain detection loop and reducing the workload of system debugging. The advanced products of this series have an intelligent recognition mode, which can effectively distinguish the touching behaviors of animals and people on the perimeter of the optical fiber, and solve the problem that the industry has long troubled.
　　This product series adopts 5VDC power supply, single zone structure, no need for wind and rain detection ring, light path open circuit and alarm independent relay dry contact output (normally open and normally closed double contacts for users to choose flexibly), simple and reliable debugging, according to the company's recommendation The sensor optical cable laying method is generally set according to the default value set by the factory, which greatly reduces the system debugging burden of the optical fiber vibration perimeter security engineering personnel. When multiple defense zones are required, the company provides a stacked chassis that can be inserted Multiple defense zones, each zone works independently, the disassembly/assembly and debugging of one zone does not affect the normal operation of other zones.

Figure 1. Optical fiber vibration detection host

Figure 2. Signal diagram of tapping on the desktop