Rotational Doppler Effect in Vortex Light and Its Applications for Detection of the Rotational Motion

The linear Doppler effect has been widely used to detect the translational motion of objects. However, it suffers difficulties in measuring the angular motion of a rotating target. In recent years, the rotational Doppler effect based on a vortex beam has been helpful to solve the problem of rotational measurement and has attracted extensive attention in remote sensing. This paper expounds the theoretical and experimental basis of the rotational Doppler effect and briefly summarizes its development for the detection of macro and micro targets. Specifically, the properties and analysis methods of a rotational Doppler shift when the vortex beam is misaligned with the rotation axis are described in detail. In addition, the existing problems and further developments in rotation detection based on the rotational Doppler effect are discussed.

Automated summary

This paper discusses the application of the rotational Doppler effect in measuring the angular motion of rotating targets. The use of a vortex beam has solved the problem of rotational measurement and has gained attention in remote sensing. The paper describes the properties and analysis methods of the rotational Doppler shift when the vortex beam is misaligned with the rotation axis and discusses the existing problems and further developments in rotation detection based on the rotational Doppler effect.