A polarized intrusion alarm device
An alarm device and polarization technology, which is applied in the direction of measuring devices, measuring the polarization of light, and alarms that rely on interference with short-wavelength radiation, can solve problems such as low sensitivity, low false alarm rate, and poor concealment, and achieve improved sensitivity, The effect of reducing the false alarm rate and improving concealment
Active Publication Date: 2016-06-08
THE THIRD RES INST OF MIN OF PUBLIC SECURITY
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Problems solved by technology
The invention is used to solve the problems of poor concealment, low sensitivity and low false alarm rate of intrusion alarm devices existing in the prior art
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[0025] The invention provides a polarization intrusion alarm device. The main idea is to lay a single-mode optical fiber in the substrate, and use the unique birefringence characteristics of the single-mode optical fiber to detect the change of the polarization state of the light wave during transmission based on the optical fiber polarization detection technology. , to determine whether it has been invaded, so as to improve the concealment and sensitivity of the intrusion alarm device, and reduce the false alarm rate of the intrusion alarm device by distinguishing the influence of temperature on the polarization state.
[0026] The birefringence characteristic means that light appears in two polarization directions during propagation, thereby forming two different refractive indices. The main reason for the birefringence phenomenon of single-mode fiber is that the cross-section of the fiber is not an ideal circle or the internal pressure of the fiber is unbalanced under stress...
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The invention relates to a polarization intrusion alarm device which comprises a light source, a floor base, a polarization detector, an information processor and an alarm. Single mode fibers are arrayed and distributed in the base. The light source is connected with light wave input ends of the single mode fibers in a coupling mode and transmits continuous pulsed light sources to the single mode fibers. The polarization detector is connected with light wave output ends of the single mode fibers in a coupling mode. The polarization detector detects the polarization state of output light waves of the single mode fibers changed due to external vibration. The polarization detector sends the detected polarization state of the single mode fiber to the information processor connected with the polarization detector so as to trigger the alarm connected with the information processor. According to the polarization intrusion alarm device, the single mode fibers of different density are laid in the base based on different security requirements, the polarization state of the single mode fibers is detected through the polarization detector and the polarization state is analyzed by the information processor so that the influences of temperature on the optical fibers are differentiated, concealment and sensitivity of the device are improved and the false alarm rate of the device is lowered.
Description
technical field [0001] The invention relates to the field of security intrusion alarms, in particular to a polarization intrusion alarm device. Background technique [0002] With the rise of the smart crime rate, the privacy requirements for various intrusion alarms (devices) are also becoming higher and higher. At present, all kinds of intrusion alarms on the market are mostly based on the fact that the light waves or microwaves emitted by the transmitter of the alarm are blocked by objects or human bodies during transmission, which then interrupts the transmission of light waves or microwaves, resulting in the receiver of the alarm not being able to receive the light signal normally. Or microwave signal, thus triggering the principle of alarm. However, based on the limitation of optical fiber or microwave transmission, the transmitting end and receiving end of the alarm device cannot be blocked by objects, so it is difficult to ensure the concealment of the alarm device w...
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IPC IPC(8): G08B13/18G01J4/00
Inventor 戎玲孙玉丽张振一史源王丽娟
Owner THE THIRD RES INST OF MIN OF PUBLIC SECURITY