CARS measurements of temperature and species concentrations in an IC engine
- Cite this article as:
- Cottereau, M.J., Grisch, F. & Marie, J.J. Appl. Phys. B (1990) 51: 63. doi:10.1007/BF00332328
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Temperature measurements alone, and also simultaneous CO2 concentration and temperature measurements, have been performed inside a fired IC engine. To tackle the two main problems encounted when making measurements in an engine (i.e., cycle-to-cycle variations and beam steering by density gradients), the shot-by-shot referencing technique and the in situ referencing technique using N2 to determine [CO2] were used. The temperature is deduced from the broadband N2 CARS signal and narrow band detection is used for CO2. A representative example of temperature measurements is given which shows a correlation between temperature and knocking intensity in the burnt gas of a knocking engine. The first simultaneous determinations of temperature and [CO2] are also reported; so far these are reliable only during the compression stoke.