Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1993-11-04
1998-02-03
Williams, Hezron E.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73705, 73 3512, 73115, 356352, 356345, 385 12, G01B 902, G02B 626, G01L 708
Patent
active
057146802
ABSTRACT:
A method and apparatus are provided for measuring pressure in a combustion chamber of an internal combustion engine is provided with a non-intrusive, metal-embedded fiber optic pressure sensor. A Fabry-Perot Interferometer is arranged in a terminated, single mode fiber to function as a pressure gauge. The fiber Fabry-Perot Interferometer (FFPI) is embedded in a metal part which is disposed in the cylinder head of the engine. The metal part and FFPI experience a longitudinal compression in response to the pressure in the chamber. In another aspect of the invention, a non-intrusive fiber containing the FFPI is embedded in a hole drilled or otherwise provided in the metal housing of a spark plug. The spark plug is threaded into the cylinder head of an internal combustion engine and is directly exposed to the combustion chamber pressure. Consequently, the spark plug housing and FFPI experience a longitudinal strain in response to the pressure in the chamber.
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Atkins Robert A.
Gardner James H.
Gibler William N.
Lee CHung-Eun
McCoy James J.
The Texas A&M University System
Wiggins J. David
Williams Hezron E.
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