采用光声光谱技术对不同成分的岩石样品进行了分析.根据一维简化模型,从理论上讨论了圆柱形光声盒内岩石样品产生的光声信号的大小,得出岩石的光声信号正比于其光吸收系数,同时也依赖于岩石的热学性质,与岩石的热扩散长度、热导率等有关.通过用光源为氙灯的光声光谱仪得到了样品的分辨率为1 nm的近红外光声光谱,实验所用样品为白砂岩、泥晶灰岩、页岩、细砾岩、花岗岩等岩石.结果表明不同岩石产生的光声信号的强弱不同,光声光谱的吸收峰个数及吸收峰波长也与岩石的种类相关.实验结果为光声光谱技术定性分析岩石的可行性提供了依据.
Different rocks were analyzed by photoacoustic spectroscopy technique. The photoacoustic signals of rock in the cylindrical photoacoustic box were discussed in theory, according to one-dimensional simplified model. The photoacoustic signal of rock not only is proportional to its light absorption coefficient, but also depends on the thermal properties of rocks, such as thermal diffusion length and thermal conductivity of rock. The near-infrared photoacoustic spectroscopy of the sample were acquired by photoacoustic spectrometer using xenon lamp with 1 nm resolution. The samples used in experiments were white sandstone, mudstone, shale, fine conglomerate and granite. The results show that the signal intensity, the number of absorption peaks and the absorption peak wavelength of the photoacoustic spectrum are associated with the types of rock. The experimental results provide a basis for the qualitative analysis of rock with the photoacoustic spectroscopy technique.
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