A light guide element, secured in a spark plug-like housing and positioned, for example, within a metallic tube forming a spark plug connector, is coated at the end facing the combustion chamber with a light-impervious material viz: graphite, the graphite emitting radiation upon influence of heat arising...http://www.google.fr/patents/US4446723?utm_source=gb-gplus-shareBrevet US4446723 - Optical combustion event sensor structure particularly knock sensor for an internal combustion engine
Optical combustion event sensor structure particularly knock sensor for an ...
