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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 15 — May. 20, 2008
  • pp: 2821–2828

Development of an in-fiber white-light interferometric distance sensor for absolute measurement of arbitrary small distances

Ayan Majumdar and Haiying Huang  »View Author Affiliations

Applied Optics, Vol. 47, Issue 15, pp. 2821-2828 (2008)

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The fabrication, implementation, and evaluation of an in-fiber white-light interferometric distance sensor that is capable of measuring the absolute value of an arbitrary small distance are presented. Taking advantage of the mode-coupling effect of a long-period fiber grating, an additional cavity distance is added to the optical path difference of the distance sensor; therefore, it can generate a sufficient number of fringes for distance demodulation even if the free-space cavity distance is very small. It is experimentally verified that the distance sensor is capable of measuring small distances that are beyond the capability of a Fabry–Perot interferometric distance sensor.

© 2008 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4610) Instrumentation, measurement, and metrology : Optical fabrication
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 28, 2008
Revised Manuscript: April 3, 2008
Manuscript Accepted: April 14, 2008
Published: May 14, 2008

Ayan Majumdar and Haiying Huang, "Development of an in-fiber white-light interferometric distance sensor for absolute measurement of arbitrary small distances," Appl. Opt. 47, 2821-2828 (2008)

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