Research On New Sensing Technology Based On Fiber Bragg Grating

As people’s understanding of the power industry deepens and the demand for reliable power increases,building a safer and more reliable power system has become a common goal of the global power industry.Safety monitoring of high-voltage transmission lines is a key research focus of the power sector.Therefore,real-time monitoring of various parameter indicators of transmission lines is necessary to provide data guidance for the reliable operation of the power system.The light intensity sensor is an important node for monitoring micrometeorology of transmission line environment,and the inclination sensor is an important node for monitoring tower settlement and deformation of transmission lines.Both are important components of the high-voltage transmission line safety monitoring system.However,traditional mechanical and electronic devices are difficult to achieve real-time measurement targets under adverse weather and strong electromagnetic interference conditions.With the development of the Internet of Things and fiber optic sensing technology,passive transmission line monitoring has gradually become a reality.Therefore,based on fiber Bragg grating sensing technology,the design and development of passive inclination sensors and light intensity sensors that are resistant to electromagnetic interference and adverse weather conditions have significant practical value in the real-time safety monitoring of high-voltage transmission lines.The main research work and achievements of this dissertation are as follows:1.The core and external packaging of the inclination sensor were designed and produced.The size and slotting of the cantilever beam in the core of the inclination sensor were theoretically analyzed and modeled,and its optimal strain performance was found.The inclination sensor was calibrated and tested,and the sensor’s range was found to be-5°～+5°,linearity was 1.27%FS,sensitivity was 0.1011nm/°,hysteresis error was 1.21%,and repeatability error was 2.97%FS.2.Three types of light intensity sensors were analyzed,which used solar panels as sensing devices,and the cantilever beam structure was selected and improved to obtain a smaller volume light intensity measurement scheme,with the longest length of the sensing structure being only 7cm.The light intensity sensor was calibrated and tested,and the measurement results were within 10%error compared with the standard electronic luxmeter measurement results.3.Based on the FBGA sensor demodulation module,a fiber grating demodulator was designed,and a sensor monitoring system was designed and built to achieve the line abnormality alarm function,providing support for the practicality of the two sensors.