Ultrasound is typically measured using phase-sensitive piezoelectric sensors. Interest in phase-insensitive sensors has grown recently, with proposed applications including ultrasound attenuation tomography of the breast and acoustic power measurement. One advantage of phase-insensitive detectors, in contrast to conventional phase-sensitive detectors, is that they do not suffer from a narrow directional response at high frequencies due to phase cancellation. A numerical model of a phase-insensitive pyroelectric ultrasound sensor is presented. The model consists of three coupled components run in sequence: acoustic, thermal, and electrical. The acoustic simulation models the propagation and absorption of the incident ultrasound wave. The absorbed acoustic power density is used as a heat source in the thermal simulation of the time-evolution of the temperature in the sensor. Both the acoustic and thermal simulations are performed using the k-Wave MATLAB toolbox with an assumption that shear waves are not supported in the medium. The final component of the model is a pyroelectric circuit model which outputs the sensor response based on the temperature change in the sensor. The modelled pyroelectric sensor response and directional dependence are compared to empirical data.

超声波通常使用相敏压电传感器进行测量。最近，人们对相位不敏感传感器的兴趣有所增长，提出的应用包括乳房的超声衰减断层扫描和声功率测量。与传统的相敏检测器相比，相位不敏感检测器的一个优点是它们不会因相位抵消而在高频下受到窄方向响应的影响。提出了相位不敏感的热释电超声传感器的数值模型。该模型由三个依次运行的耦合组件组成：声学、热学和电气。声学仿真模拟入射超声波的传播和吸收。吸收的声功率密度在传感器温度随时间变化的热模拟中用作热源。声学和热学模拟均使用k-Wave MATLAB 工具箱，假设介质中不支持剪切波。该模型的最后一个组件是热释电电路模型，它根据传感器中的温度变化输出传感器响应。将建模的热释电传感器响应和方向依赖性与经验数据进行比较。