多普勒效应问题由于涉及多个物体运动,通过列式解析寻找其关系有时比较困难,学生往往束手无策.本文试就该问题的几种类型通过s-t图像直观地描述其运动状态,以求巧妙解决.1固定波源的背面测速问题例1.利用超声波遇到物体发生反射,可以测定物体运动的有关参量(图1),图甲中仪器A和 The problem of Doppler effect is related to the motion of multiple objects, and it is sometimes difficult to find the relationship through columnar analysis. Students are often at a loss. This paper tries to describe the movement state of some types of problems intuitively through st-images in order to solve them ingeniously. .1 Problems with the speed measurement on the back side of a fixed wave source Example 1. The use of ultrasonic waves to reflect an object and reflect the relative motion of the object (Fig. 1).