Abstract：Based on the traditional transient hot-bridge sensor, a new unsymmetrical model to measure thermal conductivity—the transient hot-strip method of constant power is proposed. This model insulated the heat source and the thermometer, eliminating the influence of self-heating from strips and the ambient temperature variations. By measuring the voltage change verse time, the thermal conductivity of the material can be obtained accurately. With this method, the corresponding heat sensor is designed, and the auto measurement platform of experimental system based on LabVIEW is established. By using this platform, the thermal conductivities of several normal materials are tested. Satisfactory consistent between the values obtained here and the reference values, the relative deviation is about 3%, and the validity of the theoretical model is verified.
［1］Alvarado S, Marin E , Juarez A G, et al. A hot-wire method based thermal conductivity measurement apparatus for teaching purposes ［J］. European Journal of Physics, 2012, 33(4):897-906.
［2］李丽新,刘秋菊,刘圣春. 利用瞬态热线法测量固体导热系数［J］.计量学报,2006,27(1):39-42.
［3］Gustafsson S E, Karawacki E, Khan M N. Transient hot-strip method for simultaneously measuring thermal conductivity and thermal diffusivity of solids and fluids ［J］. Journal of Physics D: Applied Physics, 1979, 12(9):1411-1421.
［4］Gustafsson S E. Transient hot strip techniques for measuring thermal conductivity and thermal diffusivity ［J］. The Rigaku Journal, 1987, 4(1/2): 16-28.
［5］Hammerschmidt U, Sabuga W. Transient hot strip (THS) method: uncertainty assessment ［J］. International Journal of Thermophysics, 2000, 21(1): 217-248.
［6］Hammerschmidt U, Meier V. New transient hot-bridge sensor to measure thermal conductivity, thermal diffusivity, and volumetric specific heat ［J］. International Journal of Thermophysics, 2006, 27(3): 840-865.
［7］于帆,张欣欣. 热带法测量材料导热系数的试验研究［J］.计量学报,2005,26(1):27-29.
［8］Huang L, Liu L S. Simultaneous determination of thermal conductivity and thermal diffusivity of food and agricultural materials using a transient plane-source method ［J］. Journal of Food Engineering, 2009, 95(1): 179-185.
［9］李春辉, 张金涛.导热系数测量系统的数字模拟［J］.计量学报,2008,29(4):320-323.
［10］Wang H, Sen M. Analysis of the 3-omega method for thermal conductivity measurement［J］. International Journal of Heat and Mass Transfer,2009,52(s7–8): 2102-2109.
［11］Assael M, Botsios S, Gialou K, et al. Thermal conductivity of polymethyl methacrylate (PMMA) and borosilicate crown glass BK7 ［J］. International Journal of Thermophysics, 2005, 26(5): 1595-1605.
［12］Rudtsch S, Hammerschmidt U. Intercomparison of measurements of the thermophysical properties of polymethyl methacrylate ［J］. International Journal of Thermophysics, 2004, 25(5): 1475-1482.
［13］Zarr R. Standard Reference Materials: Glass Fiberboard, SRM 1450c, for Thermal Resistance from 280 K to 340 K ［R］. NIST Special Publication-260-130, 1997.
2016, Vol. 37 
