Photon counting technique applied to time-resolved laser-induced fluorescence measurements on a stabilized discharge.
Photon counting technique applied to time-resolved laser-induced fluorescence measurements on a stabilized discharge.
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光子计数技术应用于稳定放电的时间分辨激光诱导荧光测量。
DOI：
10.1063/1.4816642
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Mazouffre
中科院分区：
文献类型：
--
作者：
J. Vaudolon;L. Balika;S. Mazouffre
提出了一种新的时间分辨激光诱导荧光（LIF）测量方法。LIF技术依赖于与位于等离子体中的浮动电极上的正弦电势调制相关联的光子计数方法，以确保时间相干性。通过调谐调制频率，可以与放电电流达到谐振，以保证可重复的测量条件。放电的时间平均特性（例如Te、ne、Vp和Vion）保持不受调制的影响。作为一个例子，我们采用光子计数法与调制系统相结合的方法，测量了E × B放电中几个离子速度群的时间演化。有趣的功能的速度振荡检查和铺平道路，更有针对性的研究。
A novel approach to perform time-resolved laser-induced fluorescence (LIF) measurements in plasma discharges is presented. The LIF technique relies on a photon counting method associated with a sinusoidal potential modulation on a floating electrode located in the plasma to ensure time coherence. By tuning the modulation frequency, resonance can be reached with the discharge current in order to guarantee repeatable measurement conditions. Time-averaged characteristics of the discharge (such as Te, ne, Vp, and Vion) remain unaffected by the modulation. As an example, the association of the photon counting method with the modulation system is employed to determine the time evolution of several ion velocity groups inside an E × B discharge. Interesting features of the velocity oscillations are examined and pave the way for more focused studies.