Fiberoptic sensing technique employing RF modulated interferometry

John G. Eustace

doi:10.1117/12.2321933

1 December 1991 Fiberoptic sensing technique employing RF modulated interferometry

John G. Eustace

Proceedings Volume 1584, Fiber Optic and Laser Sensors IX; (1991) https://doi.org/10.1117/12.2321933
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

A detection technique for intensity type fiberoptic sensors is described. It employs a multimode fiber interferometer, with the sensor in one arm, excited by an LED modulated at RF frequencies f_o and 2f_o. Sensor induced changes in intensity result in corresponding changes in the ratio of the detected f_o and 2f_o signals, thus eliminating various common mode effects. Results obtained with a displacement sensor and preliminary results from a pressure sensor illustrate the capabilities of this technique.

Citation Download Citation

John G. Eustace "Fiberoptic sensing technique employing RF modulated interferometry", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); https://doi.org/10.1117/12.2321933

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