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水蒸气在7185.6 cm-1和6807.86 cm-1处的吸收线作为测温谱线对在1000~3000K的温度范围内都有较高的灵敏度和吸收线强。通过对1391 nm和1468 nm两个激光器采用时分复用的方式,可以实现上述两条H2O的吸收谱线的扫描。基于直接吸收光谱(DAS)技术,实现了对高温燃烧过程中温度和水蒸气浓度的非接触式测量。平焰炉的实验结果表明,DAS的测温结果与热电偶的结果相吻合,温度和浓度的不确定度分别为4.2%和8.7%。该方案可以用于温度跨度很大的燃烧场的诊断。
Water vapor absorption line at 7185.6 cm-1 and 6807.86 cm-1 as the temperature measurement line in the temperature range of 1000 ~ 3000K have a higher sensitivity and absorption line intensity. The time-division multiplexing of two lasers at 1391 nm and 1468 nm allows the scanning of the absorption lines of the two H 2 O 2 described above. Based on direct absorption spectroscopy (DAS), a non-contact measurement of temperature and water vapor concentration during high-temperature combustion is achieved. The experimental results of flat-fire furnace show that the temperature measurement results of DAS coincide with those of thermocouple, and the uncertainty of temperature and concentration are 4.2% and 8.7% respectively. The scheme can be used to diagnose the combustion field with large temperature span.