Wen Qing, Michaelian Kirk H
CanmetENERGY, Natural Resources Canada, 1 Oil Patch Drive, Devon, Alberta T9G 1A8, Canada.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Sep 1;73(5):823-7. doi: 10.1016/j.saa.2009.04.004. Epub 2009 Apr 22.
Photoacoustic (PA) spectra of four types of polymer resin beads, ranging in size from 35 to 150 microm, were acquired using a Fourier transform infrared spectrometer capable of both rapid- and step-scan mirror movement. Thermal diffusion lengths were on the order of the particle sizes of the beads. The PA magnitude spectra were similar to absorption spectra; both positive- and negative-going features occurred in the phase spectra. The frequency dependences of the total PA intensities of the polymer resins and carbon black differed by a factor of about f(-0.30). The intensities of the weak bands in the ratioed spectra (resin beads/carbon black) displayed a similar dependence. Partial saturation caused a more gradual variation for the stronger bands, where the intensity is proportional to approximately f(-0.1)-f(-0.2).
使用一台能够进行快速扫描和步进扫描镜移动的傅里叶变换红外光谱仪，采集了四种尺寸范围从35至150微米的聚合物树脂珠的光声（PA）光谱。热扩散长度与珠子的粒径大小相当。PA幅度光谱与吸收光谱相似；相谱中同时出现了正向和负向特征。聚合物树脂和炭黑的总PA强度的频率依赖性相差约f(-0.30)倍。比率光谱（树脂珠/炭黑）中弱带的强度表现出类似的依赖性。部分饱和导致较强谱带的变化更为平缓，其强度与大约f(-0.1)-f(-0.2)成正比。
