Object compound motion detecting device based on vortex light multiple frequency transform

Abstract

The invention relates to an object compound motion detecting device based on vortex light multiple frequency transform. The object compound motion detecting device mainly comprises parts of a laser unit, a polarizing film, a lens set, a beam splitter prism, a spatial light modulator, a plane mirror, a 4f filtering system, a frequency doubling crystal, a plano-convex lens, a photoelectric detectorand a micro oscilloscope. Firstly, a laser light source and the spatial light modulator are combined to generate superposition state vortex light, and first order diffracted light is filtrated by using the 4f filtering system; secondly, the vortex light is used for illuminating a moving object under the condition with a non-multiple frequency crystal for twice; and finally, the photoelectric detector is used for detecting intensity change of scattered beam of the surface of the object in the two times and sending signals to the oscilloscope to be analyzed. According to signal values of the twotimes of frequency displayed by the oscilloscope, the linear velocity and angular velocity of motion of the object can be calculated correspondingly. The object compound motion detecting device is simple in structure, and still can effectively work under all kinds of extreme conditions.

Description

technical field [0001] The invention mainly relates to the fields of optics, physics, photoelectric conversion, and signal detection, especially technical methods such as phase modulation, frequency multiplication conversion, and beat frequency detection of light beams. [0002] technical background [0003] The technical background of the present invention is mainly based on the vortex optical Doppler effect. Since Allen et al. discovered the orbital angular momentum of photons in 1992, the properties related to orbital angular momentum and its applications have gradually become familiar to people. The most common optical beam carrying orbital angular momentum is vortex light, which can be prepared by spiral phase plate, spatial light modulator (SLM), computational holography, etc. One of the most typical parameters of vortex light is its topological charge l, which characterizes the number of phase transitions of the vortex beam from 0 to 2π within one wavelength. From the...

AI Technical Summary

Problems solved by technology

[0013] The technical solution of the present invention is to solve the problem that the motion of non-cooperative objects in the existing space is often composed of linear motion and rotational motion, so that the motion state of the object cannot be measured effectively in all directions, and a decoupled measurement method is designed. A device for complex motion information of objects

Images