激光与光电子学进展, 2019, 56 (18): 180501, 网络出版: 2019-09-09
利用涡旋光束的旋转多普勒效应测量角速度 下载: 1092次
Angular Velocity Measurement Based on Rotational Doppler Effect of Vortex Beam
摘要
携带轨道角动量的涡旋光束具有螺旋相位波前,照射到旋转物体上可以产生与拓扑荷数、转速成正比的旋转多普勒频移。利用旋转多普勒效应测量目标旋转角速度。使用空间光调制器的计算全息法产生涡旋光束,利用MATLAB控制加载在空间光调制器上的计算全息图的角速度来模拟物体的旋转,用光学外差法搭建光路,采用拓扑荷数分别为6,10,20的涡旋光束对旋转目标进行测量,利用CCD探测较弱的差频信号光,基于光强积分方法并通过时间采样,对实验数据进行余弦函数拟合,得到目标旋转角速度,结果与预设的数值一致。
Abstract
Vortex beam carrying orbital angular momentum has spiral phase wavefront. A rotational Doppler frequency shift in proportion to topological charge and rotational speed is generated when the vortex beam irradiates on rotating object. We use rotational Doppler effect to measure the rotational angular velocity of the object. We employ a spatial light modulator to generate vortex beams based on the computer generated hologram method. MATLAB is used to control the angular velocity of the computer generated hologram loaded on the spatial light modulator to simulate the rotational speed of the object. We use the optical heterodyne method to build an optical path. Vortex beams with topological charges of 6, 10, and 20 are used to measure the rotational speed. CCD can detect weak beat signal. Using the light intensity integration method and time sampling, the cosine function is fitted to the experimental data, and the rotational angular velocity is obtained, which is consistent with the experimental preset value.
傅子玲, 王智, 崔粲, 王慧莹, 吴重庆, 王健. 利用涡旋光束的旋转多普勒效应测量角速度[J]. 激光与光电子学进展, 2019, 56(18): 180501. 傅子玲, 王智, 崔粲, 王慧莹, 吴重庆, 王健. Angular Velocity Measurement Based on Rotational Doppler Effect of Vortex Beam[J]. Laser & Optoelectronics Progress, 2019, 56(18): 180501.