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中文摘要：
根据振幅法和位相法原理,并利用激光器照射沙土混合物的不同深度的温度随时间变化的实验数据及曲线图,得出结论：在环境干燥的条件下,热扩散率大的物质,温度波能传到很深的物质层中去,相反,热扩散率差的物质,温度波不能往很深处传播,使得物质表层和内部的温度差别较大,增热和冷却都很快.
英文摘要：
Based on the principle of amplitude method and phase method,the laser is used to irradiate the mixture of soil and sand and record the temperature of different layers of the mixture,and draw the graph.The conclusion is that in dry conditions,according to the depth first-order temperature wave theory,when the material has a bigger thermal diffusivity,the wave energy can transmit to the deep layers of the material.On the contrary,the temperature wave does not spread to the deeper layers,so that the material surface temperature vary greatly,heating up and cooling the material quickly.
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