Abstract
We demonstrate new designs of piezoelectric quartz transducers for fiber-optic voltage sensors, which passively eliminate the sensitivity of the sensor to temperature. Previously1-2 fiber-optic sensors for the measurement of electric fields and voltages were described. The key element is a quartz transducer which periodically changes its dimensions in an alternating electric field (Fig. 1). The piezoelectric deformation is interrogated using either Mach - Zehnder or two-mode fiber interferometry. Quartz single crystals are well-suited as piezoelectric transducer material because they have a low dielectric constant and a large resistivity, exhibit a piezoelectric effect of useful magnitude, and allow line integration of the electric field, i.e., geometry-independent voltage measurement, for certain crystal orientations.
© 1994 Optical Society of America
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