On the basis of traditional theory and instrument of transient plane source for thermal conductivity measurement

a new pattern of heating and temperature sensing probe are designed and developed

problem of transient heat conduction of half-infinite plane while being heated is studied

a modified mathematical model of transient plane source method is established

data processing method of mathematical iteration and regression analysis is used and the modified transient plane source probe is used to achieve the measurement of both thermal effusivity and thermal conductivity coefficient of material.According to the data of experiments

the instrument which this paper designed has a high precision of 5 % and a wide range of 0.003 ～ 40 W /（m·K）

and achieves the measurement of single sample which can not be tested by traditional transient plane source method and also insitu measurement.