Abstract
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.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Hongyu Yan, Yaohui Fan, Ziyan Huang, Ruoyu Tang, Shuyu Ma, Yu Lei, You Ding, Xiangyang Zhu, Tong Liu, Zhengliang Liu, and Yuan Ren
Opt. Express 32(7) 11873-11885 (2024)
Song Qiu, You Ding, Tong Liu, Zhengliang Liu, Hao Wu, and Yuan Ren
Opt. Express 30(26) 47350-47360 (2022)
Junhong Deng, King Fai Li, Wei Liu, and Guixin Li
Opt. Lett. 44(9) 2346-2349 (2019)