The recorded correlation information can provide the charasteristic parameters of the vibration in frequency domine through frequency analysis. By using the noncontact optical method, there is no need to add an extra mass to the object.

• 由所记录的相关信息；通过频谱分析；可以得到运动的频城特性参数；这种方式是非接触式光测方法；对物体无任何附加质量的影响.