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

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