1 Tianjin University, State Key Laboratory of Engines, Tianjin, China.
2 Division of Combustion Physics, Lund University, Lund, Sweden.
Appl Spectrosc. 2018 Jul;72(7):1014-1020. doi: 10.1177/0003702818760864. Epub 2018 Jun 18.
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 (SO) 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 SO concentration and can be used for temperature measurements. The experimental results indicated that the precision of the TDS method is < ± 0.3% for SO 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.
利用差分光学吸收光谱法（DOAS）展示了一种非侵入式的气流温度测量方法。引入了源自二氧化硫（SO）在 276-310nm 波长范围内的 DOAS 光谱的温度相关光谱（TDS），并通过实验校准过程建立了 TDS 与温度之间的关系。结果表明，该关系与 SO 浓度无关，可用于温度测量。实验结果表明，在光学路径长度为 170mm 时，对于高于 150ppm 的 SO 浓度，TDS 方法的精度小于±0.3%。对于较低的浓度，在 1ppm 时估计精度为±0.4%。在 298-750K 的温度范围内，TDS 方法测量的温度与热电偶测量的温度之间的相对偏差在 3%以内，并且 TDS 方法对快速变化的温度的响应速度比热电偶更快。
