我们知道如果两个互相垂直的振动的频率成简单的整数比,合成运动的轨迹将是稳定的封闭曲线, 运动具有周期性,这种质点运动轨迹的图形称为利萨如图形。在无线电技术中, 通常利用示波器观察利萨如图形,从一个已知的简谐振动的频率可求另一个未知的简谐振动的频率。 We know that if the frequency of two mutually perpendicular vibrations is a simple integer ratio, the trajectory of the resultant motion will be a stable closed curve, and the motion is periodic. The figure of this particle motion trajectory is called the Lissajous figure. In radio technology, an oscilloscope is usually used to observe the Lissajous figure. From the frequency of a known simple harmonic vibration, the frequency of another unknown harmonic vibration can be found.