摘要
用傅里叶红外光谱仪对红外光谱进行测量时得到的是整个波带内的光谱图,有时我们只关心某一波段的光谱图,这时就必须对光谱图进行细化。本文将Chirp_z变换方法用于红外光谱的细化,利用该方法的局部光谱细化能力,有效实现了红外光谱图的局部放大。该方法可以在采样点数不变的情况下实现任意波段范围内的红外光谱图的细化,同时由于局部范围内采样分辨率的提高,将获得更高精度的红外光谱图。理论推导和实验结果表明,Chirp_z变换具有精度高、速度快和灵活性强的特点,具有很高的工程应用价值。
The spectra picture of infrared spectra in entire spectrum band can be obtained with the Fourier transform infrared spectroscopy,but sometimes only some one of the spectrums is concerned.Therefore,we need to do some spectrum thinning.The method of Chirp_z transform was used in infrared spectrum thinning,which makes the local ranges of the spectra thinned,and some of these local ranges of infrared spectra pictures were enlarged effectively.This method could realize thinning of the infrared spectra picture in any kinds of band without changing amount of the sampling points.Because the sampling resolution of these local ranges was improved,the higher precision of infrared spectra pictures could be acquired.Both the theoretical analysis and experimental results show that the method of Chirp_z transform has characteristics of high accuracy,high speed and strong flexibility,so it can be widely applied in lots of engineering projects.
出处
《光电工程》
CAS
CSCD
北大核心
2010年第11期58-62,共5页
Opto-Electronic Engineering
