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JP2010107470A Dispersion interferometer, and method of measuring physical quantity of measuring object 有权
标题翻译：分散干扰仪和测量物理量测量对象的方法
公开(公告)号：JP2010107470A
公开(公告)日：2010-05-13
申请号：JP2008282085
申请日：2008-10-31
申请人： National Institutes Of Natural Sciences , 大学共同利用機関法人自然科学研究機構
发明人： AKIYAMA TAKESHI , KAWABATA KAZUO , OKAJIMA SHIGEKI , NAKAYAMA KAZUYA
IPC分类号： G01N21/45 , G01B9/02 , G01B11/06 , G01J9/02
摘要： PROBLEM TO BE SOLVED: To provide a dispersion interferometer usable for actual time control, and capable of removing an influence of a high-frequency noise, reducing a measurement error caused by signal intensity change, and heightening accuracy, by extracting a phase from a signal intensity ratio of a fundamental wave and a double harmonic which are Fourier components of a modulated signal.
SOLUTION: A nonlinear crystal element 10 of this dispersion interferometer changes a part of laser light (fundamental wave W1) into a double harmonic W2. A photoelastic element 12 generates phase modulation in the fundamental wave W1 as much as a modulated angle frequency ω
m portion. A nonlinear crystal element 14 changes the fundamental wave W1 transmitted through plasma 30 into the double harmonic W2. A wavelength selection filter 16 allows selectively transmission of the double harmonic W2. The interferometer determines an intensity ratio between a fundamental wave component of the modulated angle frequency ω
m and a double harmonic component in an interference signal, and calculates a line average electron density which is a physical quantity of the plasma 30 based on the intensity ratio and a phase variation.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：为了提供可用于实际时间控制的分散干涉仪，并且能够通过提取相位来提取相位，从而消除高频噪声的影响，减少由信号强度变化引起的测量误差和提高精度根据作为调制信号的傅立叶分量的基波和双倍谐波的信号强度比。解决方案：该分散干涉仪的非线性晶体元件10将一部分激光（基波W1）变换成双倍谐波W2。光弹元件12在基波W1中产生多达调制角频率ω的部分的相位调制。非线性晶体元件14将通过等离子体30传输的基波W1改变为双倍谐波W2。波长选择滤波器16允许选择性地传输双倍谐波W2。干涉仪确定调制角频率ω m 的基波分量与干扰信号中的双谐波分量之间的强度比，并计算作为等离子体的物理量的线平均电子密度 30，基于强度比和相位变化。版权所有（C）2010，JPO＆INPIT

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