Abstract
Abstract We demonstrate high resolution fiber-optic dc and ac voltage sensors based on the electrostrictive effect in PMN based relaxor ferroelectrics. The quadratic relationship between the applied voltage and the induced strain in electrostrictive ceramics allows mixing of a signal at frequency ω with a carrier at a much higher frequency ω, thereby upconverting the information of interest to a frequency region (ω±ω) in which 1/f noise is not significant. Using PMN based electrostrictive elliptical transducers in conjunction with high resolution fiber optic interferometers we have observed a resolution of 129 nV/√Hz at 30 milliHertz and 40 nV/√Hz at 1 Hz. The device functions as an ac voltage sensor in the de-biased mode. We have observed resolution of < 10 nV/√Hz between 500 Hz -50 kHz when the device is used in the dc-biased mode.
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