title: Multiplex in-cylinder pressure measurement utilizing an optical fiber with specific refractive-index composition.
abstract: An approach to multiplex in-cylinder pressure measurement that utilizes a single-mode optical fiber with specific refractive-index composition has been proposed. The sensing fiber has been designed to show a certain amount of optical power loss with a small change in the fiber-local-bend radius. Along with pressure-transferring diaphragms the sensing fiber was embedded into the head gasket of a four-cylinder gasoline engine. The internal-pressure change in each combustion chamber was detected on the basis of bending power loss in the fiber. Combustion pressure peaks for each cylinder were clearly observed.
authors.forename: M
authors.initials: M
authors.lastname: Komachiya
authors.forename: H
authors.initials: H
authors.lastname: Sonobe
authors.forename: S
authors.initials: S
authors.lastname: Oho
authors.forename: M
authors.initials: M
authors.lastname: Kurita
authors.forename: T
authors.initials: T
authors.lastname: Nakazawa
authors.forename: T
authors.initials: T
authors.lastname: Sasayama