Novel Optimization Algorithm to Demodulate a PZT-FBG Sensor in AC High Voltage Measurements

The application of optical fiber sensors in high-voltage environments has long been recognized as being useful, due to many properties of silica, such as insulation and electromagnetic induction immunity. Thus, optical voltage transducers offer many improvements on traditional inductive and capacitive voltage transformers, such as linear performance, wider dynamic range, lighter weight, smaller size, and improved safety. In this paper, we aim toward a power-line voltage transformer application by using a piezoelectric ceramic crystal stack together with a fiber Bragg grating (FBG) sensor to construct the core of a potential transformer for 13.8 kV class. For the AC demodulation process, we develop a mathematical model to identify the optimization parameters through a novel algorithm to improve sensitivity on FBG demodulation. This new scheme is simple, reduces the cost of the setup implementation and shows a solution to circumvent the temperature drift of the system.