Institute for Spectroscopy, Russian Academy of Sciences, 5 Fizicheskaya Str., Troitsk, 108840 Moscow, Russia.
Chemistry Department, Analytical Chemistry Division, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
Sensors (Basel). 2018 May 17;18(5):1608. doi: 10.3390/s18051608.
A new algorithm for the estimation of the maximum temperature in a non-uniform hot zone by a sensor based on absorption spectrometry with a diode laser is developed. The algorithm is based on the fitting of the absorption spectrum with a test molecule in a non-uniform zone by linear combination of two single temperature spectra simulated using spectroscopic databases. The proposed algorithm allows one to better estimate the maximum temperature of a non-uniform zone and can be useful if only the maximum temperature rather than a precise temperature profile is of primary interest. The efficiency and specificity of the algorithm are demonstrated in numerical experiments and experimentally proven using an optical cell with two sections. Temperatures and water vapor concentrations could be independently regulated in both sections. The best fitting was found using a correlation technique. A distributed feedback (DFB) diode laser in the spectral range around 1.343 µm was used in the experiments. Because of the significant differences between the temperature dependences of the experimental and theoretical absorption spectra in the temperature range 300⁻1200 K, a database was constructed using experimentally detected single temperature spectra. Using the developed algorithm the maximum temperature in the two-section cell was estimated with accuracy better than 30 K.
提出了一种新的算法，用于通过基于二极管激光吸收光谱的传感器估计非均匀热区中的最高温度。该算法基于通过使用光谱数据库模拟的两个单温光谱的线性组合来拟合非均匀区域中的测试分子的吸收光谱。所提出的算法可以更好地估计非均匀区域的最高温度，如果只关心最高温度而不是精确的温度分布，则该算法可能很有用。该算法的效率和特异性通过数值实验得到了证明，并通过使用具有两个部分的光学单元进行了实验验证。在这两个部分中，可以独立调节温度和水蒸气浓度。使用相关技术找到了最佳拟合。在实验中使用了在 1.343 µm 附近光谱范围内的分布式反馈（DFB）二极管激光器。由于在 300⁻1200 K 的温度范围内实验和理论吸收光谱之间的温度依赖性存在显著差异，因此使用实验检测到的单温光谱构建了数据库。使用开发的算法，可以以优于 30 K 的精度估计两部分单元中的最高温度。
