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Applied Optics

Applied Optics


  • Vol. 42, Iss. 6 — Feb. 20, 2003
  • pp: 1003–1007

Interferometric fiber-optic sensor embedded in a spark plug for in-cylinder pressure measurement in engines

Taehan Bae, Robert A. Atkins, Henry F. Taylor, and William N. Gibler  »View Author Affiliations

Applied Optics, Vol. 42, Issue 6, pp. 1003-1007 (2003)

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Pressure sensing in an internal combustion engine with an intrinsic fiber Fabry-Perot interferometer (FFPI) integrated with a spark plug is demonstrated for the first time. The spark plug was used for the ignition of the cylinder in which it was mounted. The FFPI element, protected with a copper/gold coating, was embedded in a groove in the spark-plug housing. Gas pressure in the engine induced longitudinal strain in this housing, which was also experienced by the fiber-optic sensing element. The sensor was monitored with a signal conditioning unit containing a chirped distributed-feedback laser. Pressure sensitivities as high as 0.00339 radians round-trip phase shift per pounds per square inch of pressure were observed. Measured pressure versus time traces showed good agreement with those from a piezoelectric reference sensor mounted in the same engine cylinder.

© 2003 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

Original Manuscript: March 11, 2002
Revised Manuscript: August 10, 2002
Published: February 20, 2003

Taehan Bae, Robert A. Atkins, Henry F. Taylor, and William N. Gibler, "Interferometric fiber-optic sensor embedded in a spark plug for in-cylinder pressure measurement in engines," Appl. Opt. 42, 1003-1007 (2003)

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