Measurement of Burnt Gas Temperatures by an Infrared Radiation Pyrometer

概要

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An infrared radiation pyrometer which was used for the measurement of the end gas temperature in an engine has been studied to measure the burnt gas temperature in engines. The theoretical temperature of the pyrometer reading, taking account of the temperature gradients in a measured gas, effects of atmosphere along the pyrometer axis and the spectrum of H_2O used as the medium, coincides fairly well with the measured values in the range of 1550~2050 K. The scatter of the measured values fell with ±29 K RMS. The effect of CO_2 which has an absorption band in the 2.7μm H_2O band has been examined by both theoretical and experimental means. But the influence was found to be negligibly small. The free carbon particles in the burnt gas were assumed as grey body, and the effect was calculated to be negligible under the conditions investigated.
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