莫尔条纹偏转层析成像在电弧等离子体诊断中的适用性。

Applicability of moiré deflection tomography for diagnosing arc plasmas.

作者信息

Chen Yun-yun, Song Yang, He An-zhi, Li Zhen-hua

机构信息

Department of Information Physics and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

出版信息

Appl Opt. 2009 Jan 20;48(3):489-96. doi: 10.1364/ao.48.000489.

DOI:10.1364/ao.48.000489

PMID:19151817

Abstract

The argon arc plasma whose central temperature, 1.90x10(4) K, is used as a practical example for an experiment to research the applicability of moiré deflection tomography in arc plasma flow-field diagnosis. The experimental result indicates that moiré deflection of the measured argon arc plasma is very small, even smaller than that of a common flame with the maximal temperature of nearly 1.80x10(3) K. The refractive-index gradient in moiré deflection tomography mainly contributes to the temperature gradient in essence when the probe wavelength and pressure are certain in plasma diagnosis. The applicable temperature ranges of moiré deflection tomography in the argon arc plasma diagnosis are given with the probe wavelength 532 nm at 1 atm in certain measuring error requirements. In a word, the applicable temperature range of moiré deflection tomography for arc plasma diagnosis is intimately related to the probe wavelength and the practical measuring requirements.

摘要

以中心温度为1.90×10⁴K的氩弧等离子体作为实验实例，研究莫尔偏折层析成像在电弧等离子体流场诊断中的适用性。实验结果表明，所测氩弧等离子体的莫尔偏折非常小，甚至比最高温度近1.80×10³K的普通火焰的莫尔偏折还要小。在等离子体诊断中，当探测波长和压力一定时，莫尔偏折层析成像中的折射率梯度本质上主要由温度梯度引起。在一定测量误差要求下，给出了在1个大气压下探测波长为532nm时莫尔偏折层析成像在氩弧等离子体诊断中的适用温度范围。总之，莫尔偏折层析成像用于电弧等离子体诊断的适用温度范围与探测波长和实际测量要求密切相关。