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本文提出了一种确定相变界面位置的新方法,其要点如下:首先根据冻结和融化过程中温度场在不同区域的特征,将温度波分成线性分量和非线性分量;然后详细研究表面温度波非线性变换的第一个谐波,并分析日波分量在z_(?)的变化。证明随深度变化有极大值存在,其与相界面的位置相一致。与实验资料相比较,证明文中给出的确定相变界面深度的方法是正确的。本文给出的方法只适合于有自动数据采集的系统。
In this paper, a new method for determining the location of phase change interface is proposed. The main points are as follows: Firstly, the temperature wave is divided into linear component and non-linear component based on the characteristics of temperature field in the process of freezing and thawing. Then the surface temperature wave Nonlinear transformation of the first harmonic, and analysis of the day-wave component in z_ (?) Changes. Prove that there is a maximum with the depth change, which is consistent with the location of the phase interface. Compared with the experimental data, the method of determining the depth of phase change interface given in the proof is correct. The method presented in this article is only suitable for systems with automatic data acquisition.