Temperature measurement using frequency comb absorption spectroscopy of CO2

Abstract

Absorption spectroscopy on CO2 for the determination of gas temperature is reported. Direct absorption of a frequency comb laser through a gas cell at atmospheric conditions is analysed with a virtually imaged phased array spectrometer. Several measurement and analysis techniques are investigated to find the parameters most sensitive to changes in the temperature. Some of these show qualitative agreement with theoretical predictions where the trend is similar to the calculated values.