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本文以热弹理论为基础，提出了一种描述激光热弹超声的等效电路模型，该模型将激光直接照射区同周围的声传播媒质分开考虑，采用三端口网络描述了热一弹能量的直接转换，传播声场的影响则以辐射阻抗的形式出现。由于电路是由单频情况导出，故任意时间响应可通过ＩＦＦＴ算法得到。本文针对三种典型照射区，既圆板、柱和球、建立了绝抽条件下的热弹等效电路，计算了各自的时间响应，结果与格林函数解相符。
In this paper, based on the theory of thermoelasticity, an equivalent circuit model describing laser hyperelastic ultrasound is proposed. The model considers the laser direct radiation zone from the surrounding acoustic media separately. The three-port network is used to describe the thermal energy of a bomb Direct conversion, the impact of the spread of the sound field in the form of radiation impedance. Since the circuit is derived from the single-frequency case, an arbitrary time response can be obtained by the IFFT algorithm. In this paper, for three kinds of typical irradiation areas, the circular plate, the column and the sphere, the thermoelastic equivalent circuit under absolute pumping conditions is established, and their respective time responses are calculated. The result is consistent with Green’s solution.