北京师范大学学报：自然科学版2012，Vol.48Issue(3)：257-262,6.
基于最小二乘的MEVVA源产生的金属镍等离子发射谱线的单峰拟合
SINGLE PEAK FITTING BASED ON LEAST SQUARES DURING EMISSION SPECTRAL DIAGNOSIS OF NICKEL PLASMA PRODUCED BY MEVVA ION SOURCE
摘要
Abstract
Emission spectral diagnosis of MEVVA nickel plasma requires demarcation of the spectrometer collected data using the ＂Plasus Specline＂ spectrum software.Although some lines showed high intensity,but due to limited spectrometer resolution,the calibration results were not consistent with the actual situation;or rather there was no clear peak wavelength therefore calibration could not be done accurately.To solve this problem,the principle of least-squares method of function approximation was used,in combination with atomic emission spectroscopy Doppler broadening and Lorentz broadening,in the hope of considering only one mechanism for broadening,using Gaussian and Lorentz line profile function respectively to do function approximation.Let the center wavelength of approximation function be the wavelength of this line,and demarcate it using analysis software.As a result,using the ＂Plasus Specline＂ software,he accurate calibration of each spectral line collected by spectrometer was realized.In the process of function approximation,improved Newton iteration method,the variable rotation method and the pattern search method were used respectively for solving approximation function,and the effects of these three methods were compared.关键词
单峰拟合/高斯线型/洛伦兹线型/最小二乘法/优化方法Key words
single peak fitting/Gaussian line/Lorentz line/least-squares method/optimization分类
数理科学引用本文复制引用
邓春凤,廖斌,张旭,李璟,王锴,吴先映..基于最小二乘的MEVVA源产生的金属镍等离子发射谱线的单峰拟合[J].北京师范大学学报：自然科学版,2012,48(3):257-262,6.基金项目
国家自然科学基金资助项目 （）
