Signal-to-noise ratio in chirped laser dispersion spectroscopy
Signal-to-noise ratio in chirped laser dispersion spectroscopy
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DOI：
10.1364/oe.20.000644
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发表时间：
2012-01-02
期刊：
影响因子：
3.8
通讯作者：
Wysocki, Gerard
中科院分区：
文献类型：
--
作者：
Nikodem, Michal;Weidmann, Damien;Wysocki, Gerard
对啁啾激光色散光谱中的噪声源进行了定量研究和实验验证。通过实验结果支持的噪声模型，他们的信号噪声比（SNR）的影响，可实现的CLADS传感方法进行了分析。特别是该模型表明，SNR是最佳的激光啁啾率的一个给定值。实验研究进行了量子级联激光器工作在5.2 μ m的一氧化氮的检测。光学条纹是一种重要的非随机噪声源，本文还讨论了一种有效的抑制方法，可以提高信噪比。2011美国光学学会Optical Society of America
Quantitative studies and experimental validation of noise sources occurring in chirped laser dispersion spectroscopy (CLaDS) are reported. Their impact on the signal-to-noise ratio (SNR) achievable with the CLaDS sensing method is analyzed through a noise model supported by experimental results. In particular the model shows that the SNR is optimal for a given value of the laser chirp rate. The experimental studies are conducted with a quantum cascade laser operating at 5.2 mu m for the detection of nitric oxide. Optical fringing has been found to be a significant non-random source of noise and an effective reduction method that can improve the SNR is also discussed. (C)2011 Optical Society of America