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Applied Optics

Applied Optics


  • Vol. 37, Iss. 7 — Mar. 1, 1998
  • pp: 1152–1158

Knocking Detection of a Gasoline Engine by Utilizing an Optical Fiber with Specific Refractive-index Composition

M. Komachiya, H. Sonobe, T. Fumino, T. Sakaguchi, K. Kawakami, S. Watanabe, and T. Sasayama  »View Author Affiliations

Applied Optics, Vol. 37, Issue 7, pp. 1152-1158 (1998)

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Abnormal combustion of a gasoline engine is often accompanied by a sharp metallic noise called knocking. A recently proposed method of in-cylinder pressure measurement is applied to detect the knocking, where the bending power loss of a single-mode fiber with specific refractive-index composition is utilized. The high-frequency response of a prototype sensor is obtained with a small structure to utilize the bending mechanism that is installed into an engine head gasket. Knocking signals are detected in a wide range of trace- to heavy-knock conditions.

© 1998 Optical Society of America

OCIS Codes
(120.5710) Instrumentation, measurement, and metrology : Refraction
(350.0350) Other areas of optics : Other areas of optics

M. Komachiya, H. Sonobe, T. Fumino, T. Sakaguchi, K. Kawakami, S. Watanabe, and T. Sasayama, "Knocking Detection of a Gasoline Engine by Utilizing an Optical Fiber with Specific Refractive-index Composition," Appl. Opt. 37, 1152-1158 (1998)

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