On the systematic error associated with the measurement of temperature using acoustic pyrometry in combustion products of unknown mixture

Abstract

The measurement of internal gas temperature by the technique of acoustic pyrometry potentially offers excellent resolution due to its dependence on the measurement of time. The accuracy of the technique in combustion applications, however, must be questioned given its dependence on the acoustic constant, . In a typical combustion application, where the exact composition of the gas along the measuring path may not be known, this is of particular concern. Systematic errors arise due to the deviations of the actual gas properties from those assumed.