[Dynamic double modulation with step scan FTIR spectroscopy on polyurethane film].
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.
Wu
Qiang
Q
State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu 610064, China.
Lu
Xiu-shan
XS
Yang
Shu-zhen
SZ
Zhang
Bang-hua
BH
D008968:Molecular Conformation; D044367:Phase Transition; D011140:Polyurethanes / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*
D011140:Polyurethanes