Abstract: The periodic variation of temperature of the sample with time is regarded as a vibration based on the principle of vibration and wave. The temperature disturbance traveling through the sample is regarded as a wave motion. The temperature wave is defined to express the temperature varied with time and position, one - dimensional model is adopted to represent the temperature wave equation. The decay coefficient is introduced into showing dispersion of the copper bar. The temperature amplitude varies with the frequency and the transmitting distance. The experimental data is analyzed by using the Fourier transform. We get the temperature wave ampli- tude corresponding to the frequency and position. According to the decay formula, we get the decay coefficients of the fundamental and multiple frequencies. There is a correlation between the decay coefficients and the frequency of temperature wave. The higher temperature wave frequencis,the bigger decay coefficientis, and the faster temperature wave amplitude decays.

Key words: one-dimensional thermal conductive system, temperature wave, Fourier transform, decay coefficient