单个气溶胶粒子的多频光热干涉测量

IF 2.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL
Felix W. Stollberger , Michael J. Gleichweit , Ruth Signorell , Alexander Bergmann
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引用次数: 0

摘要

光热和光声信号的频率依赖性提供了气溶胶颗粒中蒸发、凝结和传热过程的信息。在单个粒子水平上进行这样的测量提高了精度,并提供了对各种粒子特性的访问。以前,这是不可能的,因为光声学需要共振声信号放大,这限制了可用的调制频率到一个值。在这项研究中,我们介绍了多频光热干涉测量(nω-PTI)对单个光捕获粒子的使用,并实验研究了光热信号的频率依赖性。通过相应的理论模型分析了观测到的信号及其与粒子和干涉仪探测光束的光学和热物理性质的关系。我们的测量证明了所提出方法的适用性,并表明单个粒子的光热振幅比以前在体测量中观察到的频率依赖性更强。此外,我们能够解耦粒子温度和热波传播的贡献,并单独检查它们的频率依赖关系。最后,我们分析了粒子对测量信号的直接影响,并展示了频率分辨光热测量在克努森跃迁区单粒子水平上研究热物理参数或光学性质的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multi-frequency photothermal interferometry of single aerosol particles

Multi-frequency photothermal interferometry of single aerosol particles
The frequency dependence of photothermal and photoacoustic signals provides information on evaporation, condensation, and heat transfer processes in aerosol particles. Performing such measurements at the single particle level increases accuracy and provides access to various particle properties. Previously, this was not possible due to the resonant acoustic signal amplification required in photoacoustics, which restricted usable modulation frequencies to a single value. In this study, we introduce the use of multi-frequency photothermal interferometry (nω-PTI) on single, optically trapped particles and experimentally investigate the frequency dependence of the photothermal signal. The observed signal and its dependence on the optical and thermophysical properties of the particle and the interferometer probe beam are analyzed by an accompanying theoretical model. Our measurements prove the applicability of the presented method and indicate a stronger frequency dependence of the photothermal amplitude from single particles than previously observed in bulk measurements. Furthermore, we were able to decouple the contributions from the particle temperature and the thermal wave propagation and examine their frequency dependencies individually. Finally, we analyzed the direct influence of the particle on the measured signal and showed the potential of frequency-resolved photothermal measurements to study thermophysical parameters or optical properties at the single particle level in the Knudsen transition regime.
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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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