Nanometer scale measurement of wear rate and vibrations by fiber-optic white light interferometry

Djinovic, Z.; Tomić, Miloš; Vujanić, A.

doi:10.1016/j.sna.2005.04.025

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…The design of the displacement sensor is similar to previous extrinsic fiber optic interferometric sensors based on the gap formed between the cleaved endfaces of two optical fibers [1,[4][5][6][7]. As shown in Figure 1, the sensor is fabricated by aligning the collimated output of a graded-index (GRIN) lens mounted on the end of an optical fiber at 90º to a reflective target surface [1].…”

Section: Measurement Principlementioning

confidence: 99%

High-G effects on optical fiber based displacement sensing for re-entry bodies

Nadler

Greene

2006

SPIE Proceedings

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Re-entry bodies are subject to extreme conditions, among them the rigorous shock, vibration, and loading characteristics that can often induce noise or loss of measurement. Restrictions by the Department of Energy on spark sources within a sealed body require the exclusive use of fiber optics for sensing. A joint effort between Los Alamos National Laboratory and Lambda Instruments has developed and evaluated a white light interferometric fiber sensor to address these concerns while measuring displacements between high explosive components in potential flight applications. The sensor offers advantages with electro-magnetic immunity, non-contact sensing elements, and high sensitivity to movement. Gap values are calculated from the extrema of the sinusoidal wavelength pattern created by the Fabry-Perot cavity between the lens and explosive surface, collected by an optical spectrum analyzer and interpreted by an external computer. This paper focuses on the interferometric concept and experimental data received from the unit in real-time during centrifuge tests. Results from single and multimode versions are presented and reported in their effectiveness for 0-2 millimeter measurements.

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Section: Measurement Principlementioning

confidence: 99%

High-G effects on optical fiber based displacement sensing for re-entry bodies

Nadler

Greene

2006

SPIE Proceedings

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“…In this paper we propose a contactless fiber-optic interferometric technique applicable for the fast and accurate measurement of the membrane thickness with accuracy of about 100nm. The method is based on low coherence interferometry, performed by "all-in-fiber" sensing configuration that is described in more details in (Djinovic et al 2005;Tomic et al 2002).…”

Section: Introductionmentioning

confidence: 99%