Detection technique effect on rotational Doppler measurements
Detection technique effect on rotational Doppler measurements
复制标题
DOI：
10.1364/ol.390425
复制
发表时间：
2020-05-01
期刊：
影响因子：
3.6
通讯作者：
Gopinath, Juliet T.
中科院分区：
文献类型：
--
作者：
Anderson, Alexander Q.;Strong, Elizabeth F.;Gopinath, Juliet T.
已有的测量旋转多普勒频移的方法有两种：（1）外差法和（2）条纹法。我们确定了一个关键的区别，即只有外差方法对旋转物体的相位敏感，这导致测量多个旋转粒子时信噪比（SNR）的显着差异。当用于测量随机分布的旋转粒子时，当存在单个粒子时，条纹方法产生最强的SNR，并且随着粒子数量的增加，其SNR趋于零，而外差方法的SNR与光束中的粒子数量成比例地增加。(C)2020美国光学学会
There are two established methods for measuring rotational Doppler shift: (1) heterodyne and (2) fringe. We identify a key distinction, that only the heterodyne method is sensitive to the rotating object's phase, which results in significant differences in the signal-to-noise ratio (SNR) when measuring multiple rotating particles. When used to measure randomly distributed rotating particles, the fringe method produces its strongest SNR when a single particle is present and its SNR tends to zero as the number of particles increases, whereas the heterodyne method's SNR increases proportionally to the number of particles in the beam. (C) 2020 Optical Society of America