Fiber-optic current sensor

Wuu Wen Lin

doi:10.1117/1.1559056

1 April 2003 Fiber-optic current sensor

Wuu Wen Lin

Optical Engineering, Vol. 42, Issue 4, (April 2003). https://doi.org/10.1117/1.1559056

When a current passes through a metal-coated optical fiber, the Ohm's heat induces a phase change of the guided light within the fiber. This microampere current sensor is principally designed based on this thermal effect. A Michelson interferometer is used for detecting this phase change. By means of our sensor, the minimum detectable phase signal is 1.6443×10²⁵ rad/Hz.^1/2 The minimum DC current detected is 3.423×10²⁷ A. The dynamical range is 89 dB with ∓60.5-dB linearity. The minimum detectable AC current is 4.193×10²⁷ A with a dynamic range around 75 dB. The linearity is within ∓61 dB for AC current.

©(2003) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Wuu Wen Lin "Fiber-optic current sensor," Optical Engineering 42(4), (1 April 2003). https://doi.org/10.1117/1.1559056

Published: 1 April 2003

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