Fiber grating entrance guard sensor

Abstract

The invention discloses a fiber grating entrance guard sensor which comprises a shell, a spiral spring touch mechanism, a strain elastic sheet, a deformation optical grating and an optical fiber. A mechanical contact mechanism is adopted, the strain elastic sheet is arranged in the shell, one end of the optical fiber is connected with one end of the deformation optical grating and is led out of the shell, the deformation optical grating is attached to the elastic face of the strain elastic sheet, the working principle that the wave length of a fiber grating is changed due to mechanical deformation of a fiber grating strain sensor is utilized, and a wave length variable quantity is transmitted through the optical fiber, so that the opening and closing states of a door and a window are known; meanwhile, in order to achieve accurate measurement, a temperature measuring elastic sheet is further arranged in the shell and used for collecting data, making a comparison on the data and preventing the phenomenon that an erroneous judgment is made due to the inaccurate data caused by the temperature difference. According to the fiber grating entrance guard sensor, the problems that a common electric sensor can not be networked, can not be used in the scene of an inhibit current and can not work under the condition of strong electromagnetic interference and a part of fiber grating magnetic sensors are low in reliability are solved, the sensitivity is high, the reliability is high, and large-scale distributed measurement is achieved.

Description

technical field [0001] The utility model belongs to the switching quantity sensing technology in the field of optical fiber grating sensing, in particular to an optical fiber grating access control sensor. Background technique [0002] In recent years, fiber optic sensing, especially fiber grating sensing, has attracted more and more attention due to its intrinsic safety, strong anti-interference ability, corrosion resistance, passive and electric monitoring, and distributed large-scale measurement. The working principle of this sensor is to convert the parameter to be measured into the change of the Bragg wavelength of the fiber Bragg grating, and the value of the parameter to be measured can be obtained by monitoring the wavelength change of the fiber Bragg grating. [0003] In the production, management and anti-intrusion process of petroleum, substation, chemical industry, energy and other places, it is necessary to monitor the opening and closing of doors and windows. ...

AI Technical Summary

Problems solved by technology

However, at present, traditional electrical Unicom sensors and infrared radios are mainly used. However, due to the inconvenience of long-distance transmission of electrical signals, they cannot be networked, and many secondary instruments, relay stations, power supplies and other equipment need to be added, and the transmission cost is high. It cannot be used in some explosion-proof, strong electromagnetic field and other occasions, and it is difficult to meet the actual needs; at the same time, the utility model patent is an access control sensing device based on a fiber grating strain sensor [Patent No.: 201220595961.8] The reliability of the sensor brought by magnetic induction is low, etc. question

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