Development of the New Double-Path Interferometer for the Measurements of Electron Density and Conductivity in the MHD Plasma

开发用于测量 MHD 等离子体中电子密度和电导率的新型双光路干涉仪

• 批准号: 06650210
• 负责人: MASUDA Mitsuharu
• 金额: $ 1.28万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650210/
• 关键词: MAGNETOHYDRODYNAMICS; MHD; FAR-INFRARED; LASER

In a large scale MHD channel, it will become important to get information on the fluctuations of the electron density and electrical conductivity, and on the correlation between them. The far-infrared (FIR) laser has offered a powerful diagnostic tool for this purpose, and the method was establish by this research that enabled the simultaneous measurements of electron density and conductivity. In the present research project, the new interferometer is proposed that could measure the large fluctuation of the electron density and conductivity with high temporal and spacial resolution. This interferometer adds another interferometric path to the conventional Michelson interferometer, and is capable of measuring the large fluctuation with the fringe shifts over 2pi. This system was constructed and tested with the experimental MHD channel operated by the combustion of kerosene. The results are summarized as follows.1. To establish the stable FIR interferometer, the new HCN laser was designed and made. This laser was proved to operate successfully and shown to be used in the interferometer system.2. The interferometer based on the entirely new concept was designed and made. This has one more interferometer path in the conventional Michelson interferometer. Also, the Schottky-barrier-diode was used to detect the fluctuation. The software that took into account the multiple interferometer path was made. It was shown that the present new system could successfully measure the fluctuations of the electron density and conductivity with high temporal and spatial resolution.

在大规模 MHD 通道中，获取有关电子密度和电导率波动以及它们之间相关性的信息将变得非常重要。远红外（FIR）激光器为此目的提供了一种强大的诊断工具，并且本研究建立的方法可以同时测量电子密度和电导率。在本研究项目中，提出了一种新型干涉仪，可以以高时间和空间分辨率测量电子密度和电导率的大波动。该干涉仪在传统迈克尔逊干涉仪的基础上增加了另一条干涉路径，能够测量条纹位移超过2pi的大波动。该系统是通过燃烧煤油的实验 MHD 通道进行构建和测试的。研究结果如下： 1．为了建立稳定的FIR干涉仪，设计并制作了新型HCN激光器。该激光器的运行被证明是成功的，并被用于干涉仪系统中。 2．基于全新概念的干涉仪被设计和制造。这比传统迈克尔逊干涉仪多了一条干涉仪路径。此外，还使用肖特基势垒二极管来检测波动。制作了考虑多干涉仪路径的软件。结果表明，目前的新系统可以成功地以高时间和空间分辨率测量电子密度和电导率的波动。

项目成果

青木俊之: "ファラデー型MHD発電機に発生する衝撃波の安定性解析" 衝撃波シンポジウム講演論文集. 259-262 (1995)

Toshiyuki Aoki：“法拉第型 MHD 发生器中产生的冲击波的稳定性分析”冲击波研讨会论文集 259-262 (1995)。

AOKI,Toshiyuki: "Unsteady Interaction of the Supesonic Plasma Flow with the Electromagnetic Field" Proc.Shock Wave Symp.239-242 (1994)

青木敏之：“超音速等离子流与电磁场的不稳定相互作用”Proc.Shock Wave Symp.239-242 (1994)

青木俊之: "ファラデー型MHD発電機内に発生する衝撃波の安定性" 日本機械学会論文集. B-61. 3712-3719 (1995)

Toshiyuki Aoki：“法拉第型 MHD 发生器中产生的冲击波的稳定性”日本机械工程师学会汇刊 B-61 3712-3719 (1995)。

青木俊之: "超音速プラズマ流れと電磁場との非定常干渉" 衝撃波シンポジウム講演論文集. 239-242 (1994)

Toshiyuki Aoki：“超音速等离子体流与电磁场之间的不稳定干扰”冲击波研讨会论文集 239-242（1994）。

青木 俊之: "超音速プラズマ流れと電磁場との非定常干渉" 衝撃波シンポジウム講演論文集. 239-242 (1994)

Toshiyuki Aoki：“超音速等离子体流与电磁场之间的不稳定干扰”冲击波研讨会论文集 239-242（1994）。