Piezoelectric-modulated optical fibre Bragg grating high-voltage sensor

Abstract

Abstract. A high-voltage sensor was developed by driving optical fibre Bragg gratings, mechanically fixed along the radial direction, with a conventional piezoelectric disc. A wavelength shift modulation is obtained as a result of the converse piezoelectric effect. The measured output signal is linear. The voltage upper limit depends on the type and thickness of the piezoceramic. A sensor built with a disc of piezoelectric PZT-4 type, 6.33 mm thick, has a dynamic range of 6.33 kVrms, a sensitivity of ∼0.108 mVp−p kV −1 rms, and a resolution of ∼0.15 kVrms, at 60 Hz. Changing the piezoelectric dimensions may enhance the sensitivity and resolution of the high-voltage sensor.