光子学报, 2015, 44 (1): 0114002, 网络出版: 2015-01-26
可调谐半导体激光吸收光谱技术的调制参量影响及优化选择
Modulation Parameters Influence and Optimal Selection of Tunable Diode Laser Absorption Spectroscopy
可调谐半导体激光吸收光谱技术 调制参量 扫描锯齿波信号 调制正弦波信号 谐波信号 Tunable Diode Laser Absorption Spectroscopy (TDLAS Modulation parameters Scanning sawtooth signal Modulated sinusoidal signal Harmonic signal
摘要
为获得较好的谐波信号, 完成不同测量目的, 以DFB-760.77 nm波长处氧气监测为例, 通过改变扫描锯齿信号和调制正弦信号的频率和幅值, 讨论了调制参量对二次谐波信号峰-峰值、对称性、谐波信号展宽和信号完整性等判别依据的影响和变化.结果表明: Sinmulink模拟值和实验值相关性较高, 当正弦调制信号和锯齿扫描信号频率比值为1 000倍时,可以获得较好的二次谐波信号.该研究为实验系统中调制参量的选取和调制度及系统准确度、稳定性、重复性等性能的优化提供了一定帮助.
Abstract
In order to select the suitable modulation parameters for harmonic signal and meet the different measurement requirements,taking a oxygen monitoring system with 760.77 nm absorption wavelength for example,the impact of different amplitude values on the symmetry,both sides minimum interval and signal integrity were discussed by changing the sawtooth and sine signal frequency.The result show that the Sinmulink values are highly relevant with experiment values and a good second harmonic signal is obtained when the ratio fsin/fsaw is 1 000.The results have profound guiding significance for the system precision,stability,repeatability and other important aspects of the experimental system.
张志荣, 孙鹏帅, 夏滑, 庞涛, 吴边, 崔小娟, 王煜, 董凤忠. 可调谐半导体激光吸收光谱技术的调制参量影响及优化选择[J]. 光子学报, 2015, 44(1): 0114002. ZHANG Zhi-rong, SUN Peng-shuai, XIA Hua, PANG Tao, WU Bian, CUI Xiao-juan, WANG Yu, DONG Feng-zhong. Modulation Parameters Influence and Optimal Selection of Tunable Diode Laser Absorption Spectroscopy[J]. ACTA PHOTONICA SINICA, 2015, 44(1): 0114002.
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