摘要
利用单缝夫琅和费衍射装置,通过转动使组成狭缝的一棱边与另一固定棱边形成分离间隙,进而使观察屏上的衍射条纹出现不对称分布现象。用最小二乘法对测量到的衍射图像的光强分布进行曲线拟合,并由拟合得到的数学表达式确定衍射条纹的精确位置。通过导出转动棱边在转动平面内2个相互垂直方向上的位移与观察屏上衍射暗纹位置间的关系式,并利用它对转动棱边的转角进行计算。实验结果表明,该方法可以实现小转角的高精度测量,转角的测量不确定度可达0.8"。
In a single slit Fraunhofer diffraction device, the dissymmetry distributing diffraction pattern can be seen on the screen by turning one edge of the single slit and fixing another. In order to ascertain the accurate position of diffraction fringe according to the math expressions, the least square method is used to fit the curves of the intensity distribution. The relation between the displacement of the turning edge in two perpendicular directions of turning plane and the positions of diffraction dark fringes can be determined and it can be used to calculate the small rotating angle. Experiments show the new method can be applied to measure small rotating angle accurately. The uncertainty of the rotating angle is 0. 8.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2006年第8期978-981,共4页
Journal of Optoelectronics·Laser
关键词
光学测量
转角
衍射
分离间隙法
optical measurment
small rotating angle
diffraction separating gap method
