摘要
由分布式的反馈激光二极管(DFB-LDs ) 的宽吸收光谱的二测量方法在检测水蒸汽吸收线被介绍。一个人是扫描方法的分部，并且由当前的调整由温度调整和快光谱调节速度调节范围利用宽光谱。明确地，这个方法被划分一个目标认识到光谱区域进对应于 DFB-LD 的特定的温度的几节，为百由当前的调整扫描每节预定，并且平均数据提起信号到噪音比率( SNR )，然后联合所有节得到整个系列。10 ppmv 的精确性被这个方法与 10 厘米的路径长度在水蒸汽的测量获得了。另外一个是适合方法的数据，基于吸收线形状功能；吸收线能被与部分测量数据适合描述。恰当的吸收线与测量数据被适合很好，并且关联系数(R 平方) 的平方是不亚于 0.99。
Two measuring methods of the wide absorption spectrum by distributed feedback laser diodes （DFB-LDs） are presented in detecting the water vapor absorption line. One is the subsection scanning method, and it takes advantage of the wide spectrum tuning range by the temperature modulation and fast spectrum tuning speed by current modulation. Specifically, this method is realized by dividing a target spectral region into several sections which correspond to the specific temperature of DFB-LD, scanning every section by current modulation for hundreds times, and averaging the data to raise the signal to noise ratio （SNR）, then combining all sections to get the whole spectrum. An accuracy of 10ppmv had been obtained in the measurement of water vapor with a 10-cm path length by this method. Another is data fitting method, based on the absorption line-shape function; the absorption line can be described by fitting with partial measured data. The fitting absorption line was fitted well with the measured data, and the square of correlation coefficient （R-square） was no less than 0.99.
基金
This work was supported by Natural Science Foundation of China （60977058 ＆ 61205083）, Independent Innovation Foundation of Shandong University （IIFSDU2010JC002 ＆ 2012JC015）, the key technology projects of Shandong Province （2010GGX10137）, and promotive research fund for excellent young and middle-aged scientists of Shandong Province （BS2010DX028）. Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author（s） and source are credited.
