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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 2,
  • Issue 2,
  • pp. 74-79
  • (1998)

Fiber Fabry-Perot type Optical Current Transducer with Frequency Ramped Signal Processing Scheme

Open Access Open Access

Abstract

The use of a fiber Fabry-Perot interferometer (FFPI) as an optical current transducer is demonstrated. A conventional inductive pickup coil converts the time-varying current I(t) being measured to a voltage waveform V(t) applied across a piezeolectric strip to which the FFPI is bonded. The strip experiences a longitudinal expansion and contraction, resulting in an optical phase shift <TEX>${\phi}(t)$</TEX> in the fiber proportional to V(t). This phase shift is measured using a frequency-modulated semiconductor light source, photodiodes to monitor the reflected light from the FFPI and the laser power, and a digital signal processor. Calibration routines compute V(t) and I(t) from the measured phase shift at a l KHz rate. Response to 60 Hz ac over the design range 0-1300A rms is characterized Transient response of the FFPI transducer is also measured.

© 1998 Optical Society of Korea

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