Calibration-free wavelength modulated TDLAS under high absorbance conditions.
Calibration-free wavelength modulated TDLAS under high absorbance conditions.
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DOI：
10.1364/oe.19.023104
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发表时间：
2011-11
期刊：
影响因子：
3.8
通讯作者：
Zhimin Peng;Yanjun Ding;Che Lu;Xiaohang Li;Kangjie Zheng
中科院分区：
文献类型：
--
作者：
Zhimin Peng;Yanjun Ding;Che Lu;Xiaohang Li;Kangjie Zheng
目前，用一阶泰勒级数近似激光传输的方法严重影响了可调谐半导体激光吸收光谱(TDLAS)气体浓度的测量精度。本文采用二阶泰勒级数近似激光传输，建立了一种直接确定气体浓度的高精度二阶算法。然后，将该算法用于测试NH-₃-空气混合物中的NH-₃摩尔分数。实验结果表明，二阶算法不仅有效地提高了气体浓度的测量精度，而且大大拓宽了TDLAS的应用范围。
Currently, the method that uses a first-order Taylor series to approximate laser transmission has seriously affected the gas concentration measurement accuracy of tunable diode laser-absorption spectroscopy (TDLAS). This paper employs a second-order Taylor series to approximate laser transmission, and a high-precision second-order algorithm has been established that can determine the gas concentration directly. Then, this algorithm is used to test the NH₃ mole fraction in a cell with NH₃-Air mixtures. Experimental results show that the second-order algorithm not only effectively improves the measurement accuracy of gas concentration but also greatly broadens the scope of TDLAS.