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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 19 — Jul. 1, 2012
  • pp: 4394–4402

Dynamics of a noncontacting, white light Fabry–Perot interferometric displacement sensor

Erik A. Moro, Michael D. Todd, and Anthony D. Puckett  »View Author Affiliations

Applied Optics, Vol. 51, Issue 19, pp. 4394-4402 (2012)

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A white light extrinsic Fabry–Perot interferometer is implemented as a noncontacting displacement sensor, providing robust, absolute displacement measurements with micrometer accuracy at a sampling rate of 10 Hz. This paper presents a dynamic model of the sensing cavity between the sensor probe and the nearby target surface using a Fabry–Perot etalon approach obtained from straightforward electromagnetic field formulations. Such a model is important for system characterization, as the dynamically changing cavity length imparts a Doppler shift on any signals circulating within the sensing cavity. Contrary to previously published results, Doppler-induced shifting within the low-finesse sensing cavity is shown to significantly distort the measurement signal as recorded by the sensor. Experimental and simulation results are compared, and the direct effects of cavity dynamics on the measurement signal are analyzed along with their indirect impact on sensor performance. This document has been approved by Los Alamos National Laboratory for unlimited public release (LA-UR 12-00301).

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: January 30, 2012
Manuscript Accepted: May 2, 2012
Published: June 26, 2012

Erik A. Moro, Michael D. Todd, and Anthony D. Puckett, "Dynamics of a noncontacting, white light Fabry–Perot interferometric displacement sensor," Appl. Opt. 51, 4394-4402 (2012)

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