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Differential Measurement for Cavity Ring-Down Spectroscopy with Dynamic Allan Variance
Journal of Spectroscopy ( IF 2 ) Pub Date : 2020-04-14 , DOI: 10.1155/2020/8398063
Zeqiang Mo 1, 2, 3 , Jin Yu 1, 2 , Jinduo Wang 1, 2 , Jianguo He 1, 2, 3 , Shoujun Dai 1, 2 , Yang Liu 1, 3
Affiliation  

The method of dynamic Allan variance (DAVAR) is used to analyze the time-varying characteristics of a nonstationary signal and is thus incorporated to evaluate the random error in the cavity ring-down spectroscopy (CRDS) experiments. With the numerical simulation of the influence of instabilities of sudden, slow, or periodic changes on the measurement accuracy in the ring-down process, DAVAR is proved to be an effective way to evaluate random error characteristics in an interfering environment. In order to minimize influences of time-varying noises in CRDS, a practical differential measurement method is proposed, in which wavelength modulation is applied to detect the ring-down times at the absorption peak and the nonabsorption peak in a time-division manner. The validity of the differential measurement is proved with its ability to compensate the influence of the environment changes and improves the accuracy from 0.181 ppm to 0.00914 ppm. The differential measurement method can be used to correct the time-varying error in real time and is helpful to improve the environmental adaptability of the CRDS instrument.

中文翻译:

动态艾伦方差的腔衰荡光谱的差分测量

动态艾伦方差(DAVAR)方法用于分析非平稳信号的时变特性,因此可用于评估腔衰荡光谱(CRDS)实验中的随机误差。通过对突然,缓慢或周期性变化的不稳定性对振铃过程中测量精度的影响进行数值模拟,证明DAVAR是评估干扰环境中随机误差特性的有效方法。为了使时变噪声对CRDS的影响最小,提出了一种实用的差分测量方法,该方法采用波长调制以时分方式检测吸收峰和非吸收峰处的衰荡时间。差分测量的有效性得到了证明,它能够补偿环境变化的影响,并将精度从0.181 ppm提高到0.00914 ppm。差分测量方法可用于实时校正时变误差,有助于提高CRDS仪器的环境适应性。
更新日期:2020-04-14
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