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Rotator angular velocity measuring system based on vortex beams

A vortex beam and measurement system technology, applied in the field of optoelectronics, can solve the problem of inability to measure the rotational speed of a rotating body, and achieve the effect of a simple measurement method

Active Publication Date: 2016-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Its purpose is to solve the problem that the rotation speed of the rotating body cannot be measured when the laser is vertically incident in the rotating body detection system

Method used

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  • Rotator angular velocity measuring system based on vortex beams
  • Rotator angular velocity measuring system based on vortex beams
  • Rotator angular velocity measuring system based on vortex beams

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The invention is mainly used for measuring the angular velocity of a rotating body, and its basic principle is Doppler frequency shift. Doppler shift means that the wavelength of light changes due to changes in the relative motion of the light source and the observer. When the object to be measured moves toward the light source, the wavelength becomes shorter and the frequency becomes higher. This phenomenon is called blue shift; when the object to be measured moves away from the light source, the opposite effect occurs, the wavelength becomes longer and the frequency becomes lower. This phenomenon is called redshift. The higher the relative motion speed, the greater the frequency shift effect produced. According to the frequency change of the received light wave, the speed of the measured object can be calculated.

[0025] For light waves, let the speed of...

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Abstract

The invention discloses a rotator angular velocity measuring system based on vortex beams. The system is based on a Doppler frequency shift principle and direction characteristics of Poynting vectors of the vortex beams. The measuring vortex beams are input vertically along the rotation axis, incident light and reflected light are in the same path, an emission end and a reception end of a detection system shared the same point, and a measurement result of the angular velocity can be obtained rapidly and accurately. During use, it is only required to irradiate the measuring vortex beams emitted by the system vertically to the rotation surface along the rotation axis of a rotator, and the measuring result of the angular velocity can be directly read. The system of the invention is simple in structure and easy to operate, and has great progress compared with the prior art.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a system for measuring the angular velocity of a rotating body based on a vortex beam. Background technique [0002] The vortex beam is a new type of beam, which has a spiral wavefront structure and each photon carries orbital angular momentum. The beam center of the vortex beam has a phase singularity, so that the light intensity of its cross section is distributed in a ring-shaped hollow. Common vortex beams include Laguerre-Gaussian beams, Bessel beams, etc. [0003] Because the vortex beam has a spiral phase, the direction of its Poynting vector is not parallel to the optical axis, but at a certain angle, so it can be used to detect the rotation of the rotating body. At the same time, vortex beams also have very important application value in other research directions such as optical communication systems, quantum communication, and vector beam generation, so they h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/36
CPCG01P3/36
Inventor 高春清付时尧张世坤
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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