Optic Fiber Bragg Grating Displacement Sensor And Its Application In Slope Protection Safety Monitoring System

At present, the displacement sensing technology development has very mature, because the displacement is relatively easy to detect the physical quantities, also in slope safety monitoring of an important physics, slope safety monitoring requirements of monitoring many factors, including slope deformation, groundwater dynamic and rock weathering velocity, etc. A slope deformation slope destruction is a prominent feature, so in the slope of the displacement monitoring research has important significance. Displacement detection technology development experiences roughly to the classical displacement measurement and semiconductor technology in two stages, Early displacement measurement is manual by people, but to the mechanization, automated testing, enter the20th century, displacement measurement for the development of power electrical measurement way, the displacement monitoring technology is a profound changes. and with the development of society, All kinds of displacement detection technology becomes mature, but with the displacement sensor applications more and more widely, in its own performance also put forward higher request, the traditional displacement sensor for its own shortcomings, the limitations of its application is more and more outstanding. Optical fiber grating sensing technology is developed in recent years to new sensing technology. On the basis of fiber grating sensor application progresses displacement displacement detection has a good application prospect, optical fiber grating has the advantages of small size, high sensitivity, and insulation resistance, electromagnetic interference ability, and other unique advantages and is suitable for the slope engineering environment more bad of the application.Use of optical fiber Bragg grating temperature and strain sensitive characteristic, and can be through the optical fiber Bragg grating indirect measurement of many physical quantities. This paper mainly use of optical fiber Bragg grating strain measurement principle, design a kind of pull Sheng Shi optical fiber Bragg grating displacement sensor, the use of safety monitoring progresses, detailed introduces the displacement sensor design research process, the structural design stage, using Pro/e Widefire3d modeling software to determine its basic structure, the sensor cantilever beam, wedge slider and spring composition of the composite structure, and the3d entity model of the assembly and analysis, according to the key parts by the sensor based on ansys finite element analysis, and verifies the sensor the reliability of the design of the key parts. The performance of the sensor to the test and temperature characteristic test, calibration experiment in to pull the rope traction move the thumb, simulation of the practical application environment, get the sensor sensing properties, and in the light of the deficiencies improving continuously, until it reaches the ideal effect. And a cantilever beam structure as the main body, the other a kind of simple design the structure of the optical fiber Bragg grating displacement sensor, the use of the sensors, combined with rock slope model as the main body the slope displacement rainfall model test. Experiment results show that this design of displacement sensor model the reliability of the application in the slope, and obtained the information and the displacement of the slope destruction rule...