本文从光波波长的洛仑兹变换出发用两种方法导出了光的多普勒效应的频率公式。
This paper, on the viewpoint of Lorentz transformation of wavelength of lightwave, derives the frequency equation of Doppler effect of light with tow methods.
根据多普勒效应，光被离子反射后，靠近激光器的光的频率会高于远离激光器的光的频率，（日常生活中，救护车警报器的音调随着车的远近也变化，就是这个道理）这才有可能测量先前对离子施加的力的大小。
(An everyday example of this effect is the change of pitch of an ambulance siren as it approaches and recedes.) It was thus possible to measure the force applied to the ions.
利用激光多普勒效应实现固体面内位移测量时，由于散射光的多普勒信号十分微弱，有时还出现淹没或不连续，影响位移测量精度。
In the displacement measurement system of scattering surface laser Doppler effect, the measuring accuracy is affected by the weakly Doppler signal that may be lost or discontinuous.
通过示波器观察光拍现象，可以帮助学生更好地理解多普勒效应，了解激光多普勒效应的应用。
Through observing the light beat on oscilloscope, the student can understand the laser Doppler effect and its application.
通过示波器观察光拍现象，可以帮助学生更好地理解多普勒效应，了解激光多普勒效应的应用。
Through observing the light beat on oscilloscope, the student can understand the laser Doppler effect and its application.
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