植物叶片的相位解析光声光谱和光声相位谱

用相位解析法获得的未损伤植物叶片叶肉组织的光声光谱，与叶片的光声相位谱进行了比较．发现植物叶片的光声相位谱与叶绿体光吸收带之间呈现互补关系．叶片表皮的光声相位谱存在持有的波谷结构．不同调制频率的光声相位谱有较大的差异．这些现象表明光声相位谱与光声光谱一样，也可对未损伤的层状生物样品作深度剖面分析．

Phase-Resolved Pbotoacoustic Spectroscopy and Photoacoustic Phase Spectrum of the Intact Leai

The phase-resolved photoacoustic spectroscopy has been used to analyse the pigmental distribution in intact plant leaves and has been compared with the photoacoustic phase spectrum of the leaves. The inverse correlation between the photoacoustic phase spectrum and absorption bands of chloroplasts has been observed. The characteristic valley exists in the photoacoustic phase spectrum of the leaf cuticle. In addition, there are some differences in the photoacoustic phase spectra obtained at different modulation frequency. The phenomena show that photoacoustic phase spectra can also be used for the nondestructive depth-profile analyses of biological sample as good as photoacoustic spectroscopy.