A simultaneous in-situ detection technique to obtain multi-optical parameters was proposed. The same 403.56 nm, low power, blue diode laser was used to conduct the cavity ring-down spectroscopy and photoacoustic spectroscopy, which were coupled. Four photoacoustic spectra were applied to the simultaneous in-situ detection of the cavity ring-down spectrum, which were systematically compared and analyzed for the first time. And the main performance of the systems varied with the arrangement of the photoacoustic pool. The results reveal that the photoacoustic response was optimized by the high reflectivity mirror with the pool constant of 1450.64 (Pα·cm)/W and the signal sensitivity of 0.2562 μv/ppb. The intensity value of the photoacoustic pool inside the cavity ring down was superimposed to 48.45% of the initial intensity. The corresponding experimental results were consistent with the theoretical analysis and shown the coupled cavity could suitable for simultaneous in-situ measurement of high concentration. The coupled two detection techniques detected different optical parameters and thus provided a new method for the simultaneous in-situ detection of the multi-optical parameters of specific atmospheric components.

中文翻译：

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光声技术用于多光学参数的腔衰荡光谱同步原位检测研究

提出了一种获得多光学参数的同步原位检测技术。使用相同的 403.56 nm、低功率、蓝色二极管激光器进行耦合的腔衰荡光谱和光声光谱。将四种光声光谱应用于腔衰荡光谱的同步原位检测，首次对其进行了系统比较和分析。并且系统的主要性能随着光声池的布置而变化。结果表明，高反射镜优化了光声响应，池常数为1450.64（Pα·cm）/W，信号灵敏度为0.2562 μv/ppb。腔内光声池的强度值与初始强度的 48.45% 叠加。相应的实验结果与理论分析一致，表明耦合腔适用于高浓度的同步原位测量。两种检测技术耦合检测不同的光学参数，为特定大气成分的多光学参数同时原位检测提供了一种新方法。