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Cost reduction and performance improvement of electric field measurement in plasmas by laser-induced fluorescence-dip spectroscopy

通过激光诱导荧光浸渍光谱法测量等离子体电场降低成本并提高性能

基本信息

批准号：
16340181
负责人：
SASAKI Koichi
金额：
$ 9.15万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The objective of this project is to reduce the equipment cost and to improve the data acquisition efficiency of the electric field measurement by laser-induced fluorescence-dip spectroscopy. The research results are summarized as follows. 1) We proposed excitation-observation schemes which are compatible with the use of diode lasers. 2) We analyzed the proposed scheme by rate equations. We found that the intensity of laser-induced fluorescence (LIF) was reduced temporally even when cw diode lasers were used for excitation. We examined the reduction ratio and the duration of the temporal reduction of LIF. 3) We demonstrated a two-step excitation scheme using a pulsed tunable laser and a diode laser. 4) To realize the excitation scheme using two diode lasers, we constructed a spectroscopy system employing a photon counter and an acoustic-optical modulator. 5) We showed the possibility that the less significant reduction LIF in the two-step excitation was attributed to the cascade transition from the laser-excited state. 6) We proposed a two-route scheme as an alternative excitation-observation scheme. We demonstrated the reduction of LIF by the two-route scheme. 7) We proposed an excitation-observation scheme employing a two-step excitation and cavity-ringdown absorption spectroscopy. 8) We demonstrated the enhancement of the data acquisition efficiency by employing a two-dimensional LIF spectroscopy system. 9) We compared the experimentally observed structure of sheathe electric field in an electronegative plasma with a theory based on a fluid model. We summarized the agreement and the discrepancy between the experimental and theoretical results.

本计画的目的在于降低雷射感生萤光光谱法电场量测的设备成本，并提高资料撷取效率。研究结果总结如下。1)我们提出了与二极管激光器的使用兼容的激发观察方案。2)我们分析了所提出的方案的速率方程。我们发现，激光诱导荧光（LIF）的强度降低时间，即使当连续二极管激光器用于激发。我们检查了LIF的减少率和时间减少的持续时间。3)我们演示了一个两步激发方案，使用脉冲可调谐激光器和二极管激光器。4)为了实现使用两个二极管激光器的激发方案，我们构建了一个光谱系统，采用光子计数器和声光调制器。5)我们表明，在两步激发的LIF减少不太显着的可能性是由于级联跃迁从激光激发态。6)我们提出了一个双路线计划作为替代的激发观察计划。我们证明了减少LIF的两个路线计划。7)我们提出了一种采用两步激发和腔衰荡吸收光谱的激发-观测方案。8)我们证明了通过采用二维LIF光谱系统的数据采集效率的提高。9)我们比较了实验观察到的电负性等离子体中鞘层电场的结构与基于流体模型的理论。我们总结了实验结果与理论结果的一致性和差异。