Measurement of the absolute absorbance based on wavelength modulation spectroscopy
Measurement of the absolute absorbance based on wavelength modulation spectroscopy
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基于波长调制光谱的绝对吸光度测量
DOI：
10.1007/s00340-017-6780-1
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发表时间：
2017-07-01
影响因子：
2.1
通讯作者：
Peng, Zhimin
中科院分区：
文献类型：
--
作者：
Du, Yanjun;Lan, Lijuan;Peng, Zhimin
线中心处的二次和一次谐波的比率对吸光度非常敏感，但当调制指数设置为0.94时，对线轮廓不敏感。基于这一特性，提出了一种利用一次谐波和二次谐波测量绝对吸光度，进而获得气体压力和浓度的方法。选取了CO_2和H_2O分子在6980 cm ~（-1）附近的一些跃迁来验证该方法。测量结果与理论值之间的令人满意的协议验证了所提出的方法。
Ratios of the 2nd and 1st harmonics at the line center are very sensitive to absorbance, but not to line profiles when the modulation index is set to 0.94. Based on this characteristic, we proposed a method which uses the 1st and 2nd harmonics to measure the absolute absorbance, and then obtain gas pressure and concentration. Some transitions of CO2 and H2O molecules near 6980 cm(-1) are selected to verify this method. The satisfactory agreement between measurement results and theoretical values validates the proposed method.