Werblinski Thomas, Engel Sascha R, Engelbrecht Rainer, Zigan Lars, Will Stefan
Lehrstuhl für Technische Thermodynamik (LTT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
Opt Express. 2013 Jun 3;21(11):13656-67. doi: 10.1364/OE.21.013656.
The first supercontinuum (SC) absorption spectroscopy measurements showing the feasibility of quantitative temperature evaluation are presented to the best of the authors' knowledge. Temperature and multi-species measurements were carried out at a detection rate of ~2 MHz in a high-temperature flow cell within a temperature range from 450 K to 750 K at 0.22 MPa, representing conditions during the suction and compression stroke in an internal combustion (IC) engine. The broadband SC pulses were temporally dispersed into fast wavelength sweeps, covering the overtone absorption bands 2ν(1), 2ν(3), ν(1) + ν(3) of H2O and 3ν(3) of CO2 in the near-infrared region from 1330 nm to 1500 nm. The temperature information is inferred from the peak ratio of a temperature sensitive (1362.42 nm) and insensitive (1418.91 nm) absorption feature in the ν(1) + ν(3) overtone bands of water. The experimental results are in very good agreement with theoretical intensity ratios calculated from absorption spectra based on HiTran data.
据作者所知，首次展示了超连续谱（SC）吸收光谱测量用于定量温度评估的可行性。在0.22 MPa压力下，于450 K至750 K温度范围内的高温流动池中，以约2 MHz的检测速率进行了温度和多物种测量，模拟了内燃机吸气和压缩冲程中的条件。宽带SC脉冲在时间上被分散为快速波长扫描，覆盖了近红外区域1330 nm至1500 nm内H2O的2ν(1)、2ν(3)、ν(1) + ν(3)泛音吸收带以及CO2的3ν(3)吸收带。温度信息是根据水的ν(1) + ν(3)泛音带中温度敏感（1362.42 nm）和不敏感（1418.91 nm）吸收特征的峰值比推断得出的。实验结果与基于HiTran数据从吸收光谱计算出的理论强度比非常吻合。
