摘要
将步进扫描多调制傅里叶红外光谱技术用于聚氨酯薄膜动态拉伸的流变光谱性质研究。讨论了步进扫描干涉仪的工作原理、包括相调制在内的多调制频率与数字采集实验设置及数字信号处理方法。得到聚氨酯薄膜在 10 0Hz频率、1 0λ振幅的相调制作用下 ,相对于 5Hz拉伸频率的同相位 (In phase)和正交相位(Quadrature)
The principle of step scan FTIR spectroscopy and the relationship between phase modulation and sample modulation were described in detail. Demodulation of the frequency domain detector signal was discussed and illustrated using double digital signal processing (DSP2) algorithm. In-phase and quadrature dynamic spectra of polyurethane with 5 Hz stretching under 100 Hz phase modulation as compared to the normal spectrum were presented. The spectral resolution of the overlapped features had greatly been enhanced.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2002年第1期25-28,共4页
Spectroscopy and Spectral Analysis
基金
国家教育部高等学校重点实验室访问学者基金
国家教育部科学技术研究重点项目资助
