雷达波以及超声波是眼睛无法观察的，传统的相控阵技术演示多为动画演示和Matlab模拟. 本文应用51单片机及3D打印技术，设计并制作了一种基于水面波的相控阵原理实验演示仪. 通过51单片机控制相邻单元开启的时间间隔，实现相邻波源的相位差控制. 该实验仪器可直观演示相控阵技术的工作原理，解决课堂上相控阵讲解无实物演示的问题. 该仪器也可用于干涉现象的教学演示，同时可以实现波长、波速、线波偏转角的测量.

Radio waves and ultrasound cannot be directly seen by eyes, so the traditional phased array technology demonstrations are mostly animation demonstrations or Matlab simulations. In this paper, a 51 MCU and 3D printing technology are employed to design and produce an experimental instrument for phased array technology demonstration by water waves. The 51 MCU is used to control the time interval which determined the phase difference of the adjacent wave sources. The experimental instrument can be used to visually demonstrate the principle of phased array technology and interference phenomenon, which solves the problem that there is no experimental instrument to demonstrate the phased array principle in classroom. It can also be used to measure wavelength, wave speed, and the deflection angle of a line wave.