本文对双平板导热仪中的过渡过程,按试样冷表面为第三类边界条件时,用有限差分方法求解了试样中的瞬变温度场,在温度场的分析解和差分解的基础上,拟订了在双平板导热仪上测定不良导热材料导温系数的方法,并作了细致的测试误差分析,文中还报道了对玻璃和加气混凝土的测试结果。 In this paper, the transition process in the dual-plate heat conduction instrument is studied. When the cold surface of the specimen is the third type of boundary conditions, the finite difference method is used to solve the transient temperature field in the sample. The analytical solution and differential solution basis in the temperature field , The method of measuring the thermal conductivity coefficient of the bad thermal conductivity material on the dual-plate thermal conductivity meter was elaborated, and the detailed test error analysis was made. The test results on the glass and aerated concrete were also reported.