Rapid numerical estimation of soil thermal properties for a broad class of heat-pulse emitter geometries
Rapid numerical estimation of soil thermal properties for a broad class of heat-pulse emitter geometries
复制标题
DOI：
10.1088/0957-0233/7/6/012
复制
发表时间：
1996-06
影响因子：
2.4
通讯作者：
S. Welch;G. Kluitenberg;K. Bristow
中科院分区：
文献类型：
--
作者：
S. Welch;G. Kluitenberg;K. Bristow
最近开发的双探头热脉冲技术可以快速、自动地监测土壤的体积热容量、热扩散率和导电率。该方法依赖于描述接收脉冲形状的方程的参数拟合。反过来，这些又取决于假设用来描述传感器系统的特定几何模型。本文描述了一种适用于一大类传感器几何形状的估计方法。该方法的主要特点是：(1)它用单一的单变量优化代替了多维的参数空间搜索；(2)点估计不需要导数；(3)除了一次性的表格预计算外，计算要求与模型的复杂性无关；(4)它根据数据计算自己的初始估计。给出了该方法的计算机实现，并用有限和无限长线源发射器对实验室双探针热脉冲实验的温度数据进行了拟合。结果表明，新方法得到的解与常用的MarQuardt算法完全相同。
The recently developed dual-probe heat-pulse technology permits the rapid, automatic monitoring of soil volumetric heat capacity, thermal diffusivity, and conductivity. The method relies on parameter fits of equations describing received pulse shape. These, in turn, depend on the particular geometric model assumed to characterize the sensor system. This paper describes an estimation procedure applicable to a wide class of sensor geometries. Key attributes of the method are that: (1) it replaces multidimensional, parameter space searches with a single, univariate optimization; (2) no derivatives are required for point estimates; (3) except for a one-time-only table precalculation, computational requirements are independent of model complexity; and (4) it computes its own initial estimates from the data. A computer implementation of the method is presented along with fits of finite and infinite line source emitters to temperature data from laboratory dual-probe heat-pulse experiments. The results show the new method gives answers identical to the commonly used Marquardt algorithm.