| 双光栅测速 |
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| 引用本文： | 陈水波.双光栅测速[J].大学物理,2008,27(1):39-42. |
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| 作者姓名： | 陈水波 |
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| 作者单位： | 武汉理工大学,理学院,湖北,武汉,430070 |
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| 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.
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| 关 键 词： | 双光栅 多普勒频移 测频 不确定度 |
| 文章编号： | 1000-0712（2008）01-0039-04 |
| 收稿时间： | 2006-10-26 |
| 修稿时间： | 2007-06-27 |
The velocity measured by couple gratings |
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| CHEN Shui-bo.The velocity measured by couple gratings[J].College Physics,2008,27(1):39-42. |
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| Authors: | CHEN Shui-bo |
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| 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. |
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| Keywords: | couple gratings Doppler shift to measure the frequency uncertainty |
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