Optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection and manufacturing method thereof

Abstract

The invention relates to an optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection and a manufacturing method thereof. The optical fiber double Fabry-Perot cavity ultrasonic sensor comprises a light source, an optical fiber 1/2 optical splitter, an optical fiber, an optical fiber coupler, an optical fiber EFPI double Fabry-Perot cavity probe, a double-channel photoelectric detector, a high-speed data acquisition device and a differential denoising algorithm module. The light source is connected with the optical fiber coupler through the optical fiber 1/2 optical splitter, the optical fiber coupler is respectively connected with the optical fiber EFPI double Fabry-Perot cavity probe and the double-channel photoelectric detector, the double-channel photoelectric detector is connected with the high-speed data acquisition device, and the high-speed data acquisition device is connected with the differential denoising algorithm module. Compared with the prior art, the advantages of eliminating interference deviation of the system and the external environment to the Fabry-Perot cavity during working and the like can be achieved.

Description

technical field [0001] The invention relates to a sensor for partial discharge detection, in particular to an optical fiber dual-percent cavity ultrasonic sensor for partial discharge detection and a manufacturing method thereof. Background technique [0002] At present, the extrinsic Fabry-Perot Interferometer (EFPI) sensor method, that is, the fiber optic EFPI sensor, has been widely studied and applied to electrical equipment such as transformers and gas-insulated composite electrical appliances. (Partial discharge, PD) ultrasonic signal detection and positioning. [0003] The optical fiber EFPI sensor is a set of high-speed sensors that use a sensitive diaphragm structure to convert ultrasonic waves into mechanical vibrations, and then convert mechanical vibrations into optical parameter changes using Falper interference technology, and are finally converted, collected, and demodulated by photoelectric detectors and other related components. performance ultrasonic signa...

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Problems solved by technology

[0004] However, the current sensor system has problems with the stability of the range and working point. Due to the low cost and fast response of light intensity demodulation, current research and applications have chosen light intensity demodulation as the signal recovery method of the EFPI sensor. Fluctuation, optical fiber bending loss, environmental temperature changes, detector aging and other effects will reduce the measurement accuracy of the sensor and cause the "static operating point" to drift. Therefore, self-compensation measures are required to ensure the stability of the operating point. The interference deviation formed by the external environment on the work of the Fappel cavity

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