Gas Temperature Measurement Using Differential Optical Absorption Spectroscopy (DOAS)

Research output: Contribution to journalArticle


A nonintrusive method for flow gas temperature measurement using differential optical absorption spectroscopy (DOAS) was demonstrated. A temperature-dependent spectra (TDS) originated from the DOAS spectra of sulfur dioxide (SO2) in the wavelength range of 276–310 nm was introduced, and the relationship between the TDS and the temperature was built through experimental calibration process. This relationship is found to be independent of SO2 concentration and can be used for temperature measurements. The experimental results indicated that the precision of the TDS method is < ± 0.3% for SO2 concentrations higher than 150 ppm with the optical path length of 170 mm. For lower concentrations, the precision is estimated to be ± 0.4% at 1 ppm. The relative deviation between the temperature measured by the TDS method and that measured by a thermocouple is within 3% in the temperature range of 298–750 K, and the TDS method has a quicker response to the fast-changing temperature than the thermocouple.


External organisations
  • Tianjin University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering


  • absorption spectroscopy, differential optical absorption spectroscopy, DOAS, Sulfur dioxide, temperature measurement
Original languageEnglish
Pages (from-to)1014-1020
JournalApplied Spectroscopy
Issue number7
Early online date2018 Jan 1
Publication statusPublished - 2018
Publication categoryResearch