大学物理 ›› 2008, Vol. 27 ›› Issue (1): 39-39.

• 著者文摘 • 上一篇    下一篇

双光栅测速

陈水波   

  1. 武汉理工大学理学院,湖北武汉430070
  • 出版日期:2008-01-20 发布日期:2008-01-20

The velocity measured by couple gratings

  • Online:2008-01-20 Published:2008-01-20

摘要: 双光栅的多普勒频移正比于动光栅的速度,所以测出了多普勒频移就可以定出动光栅的速度.通过对不确定度的分析,得出的结论是:速度测量的相对不确定度等于光栅常数的相对误差.

关键词: 双光栅, 多普勒频移, 测频, 不确定度

Abstract: As the Doppler shift of couple gratings is direct proportional to the velocity of the moving grating, the velocity can be measured by measuring the Doppler shift. Having analysed the uncertainty of velocity , the conclusion is that the relative uncertainty of measured velocity equals the relative error of grating constant.

Key words: couple gratings, Doppler shift, to measure the frequency, uncertainty

中图分类号: 

  • O438.3