We have adapted our in-cylinder Fourier-transform spectroscopy technique to measure absorption spectra in a reciprocating engine. Previously, we had used the technique for emission spectroscopy; the upgrade to absorption spectroscopy mode is important because it allows for more quantitative anal ysis of gas properties than is possible with emission spectroscopy. Here, we discuss fuel, ${\mathrm{H}}_2\mathrm{O}$ , and ${\mathrm{CO}}_2$ spectra measured in an engine using a spark-plug-based probe for optical access and use the water portion of the spectra to determine in-cylinder gas temperature. The temperature results show that heat transfer effects can significantly bias thermometry when fiber-coupled engine probes are used.

© 2010 Optical Society of America

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