双光栅测量微弱振动位移量的实验研究  

Double Grating Measuring Weak Vibration Displacement Experiment Research

作　　者：范菁津 邱文杰[1] 郑志远[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《大学物理实验》2017年第2期41-43,共3页Physical Experiment of College

摘　　要：对于利用双光栅测量微弱振动仪寻找谐振频率、改变配重物体的质量分布对谐振点的影响,驱动电流对谐振点的影响以及一些实验中的技术问题,利用观察法、控制变量法等方法作图,由于谐振点附近拍频波个数变化较大,提高精度可以绘出较准确的谐振曲线并找到较精确的谐振点;通过对比小棒和橡皮泥,得出橡皮泥改变配重物体的质量分布实验效果更明显,排除了小棒颤动的影响;且得出了谐振频率与驱动电流呈正相关的结论。提出对实验中遇到问题的解决方法提高了该实验的准确性,降低实验误差。For the use ol double grating measuring weak vibration meter to find the resonant lrequency,change the weight distribution of the mass of the body,s influence on the resonant point, the influence of drive current ol resonant point and some technical problems in the experiment, using the method ol observation and control variable method such as drawing, because the beat frequency near resonance wave number change is bigger, improve accuracy can draw more accurate curve and find more precise resonant point; By comparing the stick and silly putty, silly putty change weight distribution experiment effect is more obvious, the mass ol the body ruled out stick fibrillation;And it is concluded that the resonance frequency was positively correlated with the drive current.Put for ward the problems in the experiment of solution to improve the accuracy of the experi-ment ,to reduce experimental error.

关 键 词：拍频波 频率 谐 

分 类 号：O4-34[理学—物理]