The Investigation On Light Intensity Monitoring System Design Based On Fiber Bragg Grating Sensing Technology

With the development of social wisdom, the demand for meteorological information acquisition is increasing day by day. As one of the most important meteorological monitoring objects, light intensity has important monitoring requirements in the fields of smart grid and intelligent agriculture, and its effective monitoring is receiving more and more attention and research. As the current more mature electronic light intensity monitoring technology requires the existence of active power supply, weak anti-electromagnetic interference and other problems,making its application has been greatly limited. Therefore, it is of great value to study the new technique of light intensity measurement with passive and anti-electromagnetic interference.In this paper, the light intensity measurement technology and implementation based on optical fiber sensing technology are studied. The main research work and achievements are as follows:1. Three kinds of optical fiber intensity measurement schemes based on heating resistor, giant magnetostrictive material and cantilever beam are designed, and their feasibility and performance are respectively analyzed and compared and simulated. Based on the analysis of performance, cost and feasibility, a cantilever beam based measurement scheme is optimized.2. A cantilever optimization scheme and a coil series scheme are proposed for cantilever-beam-based fiber-optic light intensity measurement scheme where the cantilever strain is too small and the magnetic field of the conducting coil is too small. Modeling simulation or experimental exploration. The results show that the maximum strain of the optimized cantilever beam is nearly 4 times of that before optimization,and the magnetic field of the coil series scheme can be improved by 5 times.3. The system is divided into five parts: light data acquisition module,data transmission channel, optical signal transmitting and receiving module, data processing module and display module. Through the actual system construction and operation test, it is proved that the system has high stability and small error.