Abstract

Combustion control requires visible photodetectors to sense the CH*CL emission at 430nm that combined with a visible–blind UV photodetector allows us to obtain the OH*CH* ratio. UV–visible P-InGaN∕GaN multiple quantum well-N photodiodes with 1518mm2 areas were fabricated to conduct OH*(308nm) and CH*CL detection without external filters. Bandpass detectors at 230390nm and 360450nm presented linear responses over five decades and rejection ratios >103 at 430 and 308nm, respectively. A full optical sensor system was built and detectors operated at 120°C in a combustion chamber, showing linear responses within the dynamic range, maximum signal-to-noise ratios of 103 and response times of <1s. An exponential association dependence between the optical OH*CH*CL signals and the gas∕air ratios was found.

© 2006 Optical Society of America

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