中国计量大学学报2024，Vol.35Issue(1)：22-27,6.DOI:10.3969/j.issn.2096-2835.2024.01.004
用于离轴积分腔输出光谱的非对称拟合算法设计
Design of skewed fitting algorithm for off-axis integrated cavity output spectroscopy
摘要
Abstract
Aims:This study aims to investigate the issue of skewed absorption spectra caused by fast laser scanning in off-axis integrated cavity output spectroscopy(OA-ICOS)and address the limitations of traditional linear fitting functions,which result in large fitting errors and low measurement accuracy.Methods:This paper presents a skewed fitting algorithm based on OA-ICOS to improve the measurement accuracy by fitting the skewed absorption spectra.The algorithm analyzes the causes of spectral skewness based on the principles of OA-ICOS and incorporates the skewed characteristics using the Voigt line shape function to obtain a fitting function with the skewness factor.Results:In the experiments,with laser scanning frequencies set at 50 Hz,150 Hz,and 300 Hz,the deviations of the absorption peak positions obtained by the Voigt fitting algorithm were 4 × 10-3 cm-1,4.8× 10-3 cm-1,and 6.2× 10-3 cm-1,respectively.However,using the skewed fitting algorithm,the deviations of the absorption peak positions were only around 2.4×10-3 cm-1,2.4× 10-3 cm-1,and 1.5×10-3 cm-1,respectively.Conclusions:This method can accurately fit the skewed absorption spectra signals under fast laser scanning frequencies,thereby improving the fitting accuracy.关键词
积分腔输出光谱技术/离轴入射/谱线非对称/快速激光扫描频率Key words
integrated cavity output spectroscopy(ICOS)/off-axis incidence/skewing effect/spectral line skewness/fast laser scanning frequency分类
数理科学引用本文复制引用
毛至帅,王坤阳,徐时清,张军杰,王世锋,郭杰..用于离轴积分腔输出光谱的非对称拟合算法设计[J].中国计量大学学报,2024,35(1):22-27,6.基金项目
国家自然科学青年基金项目(No.42205144),浙江省重点研发计划项目(No.2022C03098) （No.42205144）
