Fabrication of Fabray-Perot Sensor Based on Stainless Steel Diaphragm and Its Sensing Characteristics of Partial Discharge Ultrasound

Partial discharge is the main reason for the deterioration of the insulation performance of electrical equipment insulators. The vicious circle of electrical equipment insulation under the action of partial discharge will eventually lead to the destruction of the entire insulation system. Effective detection of partial discharge is an important means to ensure the safe operation of electrical equipment. The optical fiber Fabray-Perot ultrasonic sensor has been widely studied because of its high sensitivity, strong stability, strong anti-electromagnetic interference ability, small size, and good insulation performance. In this paper, a diaphragm vibration model in a liquid environment is established. The composite diaphragm of the Fabray-Perot sensor is prepared by using the stainless steel diaphragm and 353 ND glue. The influence of the liquid environment temperature on the Fabray-Perot sensor is analyzed. The ultrasonic detection characteristics of the Fabray-Perot sensor are tested by the needle-plate discharge model, and compared with the traditional piezoelectric sensor.