Abstract
The simultaneous and independent measurement of multiple movement forms is a significant issue to be solved in research. In this paper, we proposed a method that combines the self-interference of conjugated optical vortices and external interference of plane waves, and successfully realize the independent measurement of both rotation and rectilinear motion. Three kinds of interference schemes based on vortex beams are analyzed theoretically and verified experimentally. The results show that the double interference between conjugated optical vortices and Gaussian beam can detect the motion along and perpendicular to the beam propagation direction even under complex motion background, providing a powerful way to detect the multiple movement forms of a target. Ourwork may pave a new way for the detection of spatial noncooperative targets and stimulate the invention of new detection equipment.
Highlights
Objects moving in free space usually possess various forms of movement [1, 2], including but not limited to rotation, rectilinear motion, nutation, vibration, etc. to name a few.It is a universally acknowledged tricky problem to realize the independent measurement of multiple motion parameters of objects [3]
We proposed a method that combines the self-interference of conjugated optical vortices and external interference of plane waves, and successfully realize the independent measurement of both rotation and rectilinear motion
The famous Doppler effect provides a powerful tool in detecting moving objects [6] and has been widely used in our daily life, such as Doppler velocimeter [7], color ultrasonic diagnosis [8], et al But traditional Doppler effect is only sensitive to the linear motion along the beam propagation direction which can be called the linear Doppler effect (LDE) [9, 10]
Summary
Objects moving in free space usually possess various forms of movement [1, 2], including but not limited to rotation, rectilinear motion, nutation, vibration, etc. to name a few.It is a universally acknowledged tricky problem to realize the independent measurement of multiple motion parameters of objects [3]. Objects moving in free space usually possess various forms of movement [1, 2], including but not limited to rotation, rectilinear motion, nutation, vibration, etc. The famous Doppler effect provides a powerful tool in detecting moving objects [6] and has been widely used in our daily life, such as Doppler velocimeter [7], color ultrasonic diagnosis [8], et al But traditional Doppler effect is only sensitive to the linear motion along the beam propagation direction which can be called the linear Doppler effect (LDE) [9, 10].
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