Abstract
The nonlinear strain–polarisation relationship in electrostrictive ceramics is exploited to demonstrate, for the first time, detection and mixing of microwave signals in a fibre-optic electrostrictive sensor. The nonlinear electrostrictive transducer mixes the microwave signal with a signal from a local oscillator, and the resulting strain at the intermediate frequency is detected with a fibre-optic interferometer. The sensor demonstrated approximately flat response in the microwave regime (up to 20 GHz) with a resolution of 5 × 10-6 V/√Hz.
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