US 6,981,406 B2
Fiber optic cylinder pressure measurement system for a combustion engine
Christopher A Willner, Rochester, Mich. (US)
Assigned to DaimlerChrysler Corporation, Auburn Hills, Mich. (US)
Filed on Sep. 24, 2002, as Appl. No. 10/253,137.
Prior Publication US 2004/0057645 A1, Mar. 25, 2004
Int. Cl. G01M 15/00 (2006.01)
U.S. Cl. 73—116 20 Claims
OG exemplary drawing
 
1. A system for measuring at least one operating parameter of an internal combustion engine comprising:
a first fiber optic cable carrying a Bragg grating located at a predetermined position within the engine and having a light absorbing material in a terminal end thereof;
a light source optically coupled to a first end of the first fiber optic cable;
a second fiber optic cable optically coupled to the first fiber optic cable;
a device for measuring optical wavelength coupled to a first end of the second fiber optic cable;
a device for measuring light intensity coupled to a second end of the second fiber optic cable; and
a controller coupled to the device for measuring light intensity and the device for measuring wavelength and operative to generate a signal indicative of the at least one operating parameter in response to signals generated by the devices for measuring.