Analysis of Factors Affect the Sensitivity of Fluorescent Fiber Optic Sensor

In order to research the influencing factors to the sensitivity of the fluorescent fiber sensor which applied in the GIS (gas insulated switchgear) partial discharge detection, the GIS model is built in TracePro optical simulation software for simulation and the influence of the diameter, shape, placement angle of the fluorescent fiber and the position of the discharge on the sensor sensitivity is analyzed. The simulation results show that as the diameter increases, the sensitivity increases but this increment gradually decreases and the gap between the theoretical value and actual value becomes wider. As the diameter increases 0.5mm and the efficiency decreases by about 7%. There are sensors of 5 shapes with the same volume. The sensitivity of the 1mm thin plate is the highest whereas the lowest of the sphere. For the planar Archimedes spiral sensor, sensitivity is lower than the three-dimensional one. The difference between them is about 10.1%. When the placement angle of the sensor is rotated from parallel to highvoltage guide rod to vertical to it, the sensitivity always decreasing, and the decreased value increases. Finally, as the partial discharge source is closer to the sensor, the luminous flux detected by the sensor is larger, and the magnitude of the increase gradually increases. When the partial discharge source is on both sides of the vertical guide rod, the luminous flux detected by the sensor differs by about 10 times. The turning point of GIS and high-voltage guide rod have a great influence on the detection of sensors.