Dual-resolution noncontact vibration and displacement sensor based upon a two-wavelength source

Steven C. Bartlett; Faramarz Farahi; David A. Jackson

doi:10.1117/12.20309

1 August 1990 Dual-resolution noncontact vibration and displacement sensor based upon a two-wavelength source

Steven C. Bartlett; Faramarz Farahi; David A. Jackson

Author Affiliations +

Proceedings Volume 1267, Fiber Optic Sensors IV; (1990) https://doi.org/10.1117/12.20309
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

A simple optical fibre sensor system based upon a two wavelength source is presented. The system may be operated in two modes: 1) a normal heterodyned interferometric sensor yielding nanometre resolution, and 2) a subcarrier system with much enhanced unambiguous range, but reduced resolution. Results indicate a displacement resolution of greater than 1mm, and vibration amplitude resolution of greater than 1Oim over a 22cm unambiguous range are achieveable. A major advantage of this system is that heterodyne signal processing has been achieved without the use of a frequency or phase shifter.

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Steven C. Bartlett, Faramarz Farahi, David A. Jackson, "Dual-resolution noncontact vibration and displacement sensor based upon a two-wavelength source", Proc. SPIE 1267, Fiber Optic Sensors IV, (1 August 1990); doi: 10.1117/12.20309; https://doi.org/10.1117/12.20309

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