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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.

With the development of technology, the way of teaching is changing constantly. The year of 2016 was called "VR (virtual reality) year", in which numerous VR software start to be noticed by educators as an important part of teaching. However, because of its immersion, interaction and imagination features, the traditional classroom teaching mode is not suitable for this new technology. This study based on the study of the virtual reality learning environment, expositing the instructional design mode of virtual reality technology curriculum. Then giving an curriculum case to show the model under the guidance of virtual reality instructional design concretely.