Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7845921 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2018 | 7 Pages |
Abstract
Gas temperature may be inferred by comparing smoothed measurements of absorption spectra spanning >100 cmâ1 to smoothed simulations of the same. Using this thermometry approach in a heated static cell at temperatures up to 1723â¯K, we studied H2O vapor absorption near 7450 cmâ1, dominated by features in the R-branch of the v1â¯+â¯v3 absorption band. In a first experiment, the cell was operated at 1200-1723â¯K and 0.0235â¯bar, while a commercial external cavity diode laser scanned the 7321-7598 cmâ1 range. Temperatures inferred from the measured spectra using BT2 simulations were, on average, within 2â¯K of the actual cell temperature and fell within the limits of error (±0.5% of reading) for the thermocouple used to monitor gas cell temperature. Temperatures inferred using HITEMP2010 simulations were, on average, 38â¯K lower than actual cell temperatures. In a second experiment, the cell was operated at 296-1723â¯K and 1â¯bar while a swept-wavelength laser monitored the 7347-7536 cmâ1 range at 10â¯kHz repetition rate. Temperatures inferred using BT2 simulations were within 3â¯K of the actual cell temperatures, within the limits of error for the gas cell thermocouple measurements.
Related Topics
Physical Sciences and Engineering
Chemistry
Spectroscopy
Authors
Scott T. Melin, Scott T. Sanders,