Packaging and Performance of a Piezo-Optic Voltage Sensor
There is growing interest in sensor technology that is immune to electro-magnetic interference. By nature, development of this technology covers multiple physical domains including electronics, optics, mechanics and materials. This paper discusses the design, fabrication and characterization of a piezooptic voltage sensor. The sensor utilizes piezoelectric fibers with interdigitated electrodes coupled to an optical wave guide via a dielectric matrix. The unknown voltage energizes the piezoelectric fibers to deform fiber Bragg gratings (FBGs) on the waveguide. Therefore, a measurable change in wavelength is related to the unknown voltage. The sensor is fabricated using a high quality, repeatable lamination process that does not require the handling of individual piezoelectric fibers. Characterization tests indicate the utility of the sensor in a simulated mission profile. Issues such as hysteresis, creep and optical polarization dependence were also identified.