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Method and device for detecting angular velocity of rotating body capable of eliminating the influence of obstacles

A technology of rotating body and angular velocity, which is applied in the field of angular velocity detection of rotating body, can solve the problems affecting the detection accuracy, etc., and achieve the effect of eliminating influence and simple measurement

Active Publication Date: 2020-05-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, researchers have used the Laguerre-Gaussian beam with vortex phase to realize the measurement of the rotational speed of the rotating body. However, when there is an obstacle between the wave source and the object to be detected, the diffraction effect will make the orbital angular momentum of the Laguerre-Gaussian beam Spectrum broadening, which affects detection accuracy

Method used

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  • Method and device for detecting angular velocity of rotating body capable of eliminating the influence of obstacles
  • Method and device for detecting angular velocity of rotating body capable of eliminating the influence of obstacles
  • Method and device for detecting angular velocity of rotating body capable of eliminating the influence of obstacles

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Embodiment 1

[0057] Embodiment 1: A dual-mode multiplexed Bessel Gaussian beam with opposite angular quantum numbers realizes the detection of the angular velocity of a rotating body.

[0058] In this embodiment and the following two embodiments, the ω of the Bessel Gaussian beam 0 The values ​​are all 1.5mm.

[0059] by giving figure 2 The liquid crystal spatial light modulator in the shown device is loaded with different holographic gratings to realize the generation of different dual-mode multiplexed Bessel Gaussian beams with opposite angular quantum numbers, and serve as probe beams. The light field distribution of the beam detected by the area array detector is as follows: image 3 shown. Figure 4(a) and Figure 4(b) show the time-domain signals of the stray light measured by the detector when the dual-multiplexed Bessel Gaussian beams of ±20 and ±22 are incident, respectively. It can be seen that the amplitude modulation of stray light is approximately sinusoidal. In order to a...

Embodiment 2

[0060] Embodiment 2: Detection of the angular velocity of a rotating body under different angular velocities and different angular quantum numbers (±l) of the probe beam.

[0061] In order to verify whether the intensity modulation frequency measured by this measurement method is consistent with the formula of theoretical analysis, we measured the intensity modulation frequency measured under different angular velocities and different angular quantum numbers (±l) of the probe beam. The measurement results are as follows Figure 6 shown. It can be seen that the measured results (scattered points) are in good agreement with the theoretical values ​​(solid line), indicating that the measurement method of the present invention has very good linearity.

Embodiment 3

[0062] Example 3: Measurement of scattered light intensity modulation frequency when there is an obstacle in the detection beam transmission path

[0063] When there is an obstacle in the transmission path of the detection beam, and the maximum blocking distance of the obstacle is less than the distance from the rotating body, due to the self-healing characteristics of the Bessel Gaussian beam, the measurement of the rotating speed of the rotating body will not be affected . In this embodiment, we choose a cylindrical obstacle with a diameter of 0.37mm and place it in the center of the light beam. In the current situation, the maximum occlusion distance of obstacles is 8.36cm. When the distance from the adjustable speed turntable is 38, 33, 28, 23, 19cm, the spectrum of the scattered light is measured, such as Figure 7 shown. It can be seen that when the maximum blocking distance of obstacles in the optical path is less than the distance from the rotating body, and the obs...

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Abstract

The invention discloses a rotator angular velocity detection method and apparatus capable of removing the influence of obstacles. The present invention employs a dual-mode multiplexed Bessel Gaussian beam with opposite azimuthal quantum numbers as a probing beam, and when it is irradiated onto a rotating body along the rotation axis, the scattered light is intensity-modulated. Through the detection of the intensity-modulated frequency, it is possible to reverse the rotation velocity of the rotating body. In addition, due to the Bessel Gaussian beam's non-diffraction characteristics, it is possible to eliminate the influence of the obstacles in an optical path. The experiment has proven that regardless of existence of obstacles in the optical path or not, the method and apparatus of the invention can accurately measure the rotation velocity of a rotating body very surely. The system of the invention is stable in structure and can be conveniently operated to realize the real time detection of the angular velocity of a rotator; and it can eliminate the influence of obstacles in the optical path to some extent, a big step forward from the prior art.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a method and device for detecting the angular velocity of a rotating body that can eliminate the influence of obstacles Background technique [0002] The Bessel beam is the characteristic solution of the Helmholtz equation in the cylindrical coordinate system. It has an infinitely extended transverse mode distribution, and also has no diffraction characteristics and can be "self-healing". However, ideal Bessel beams do not exist in practice. In practice, the Bessel Gaussian beam is generally chosen as the approximation of the Bessel beam. Similar to the Bessel beam, the Bessel Gaussian beam also has non-diffraction characteristics and self-healing properties within a certain distance, and its light field distribution can be expressed as: [0003] [0004] in, is polar coordinates, J l is the Bessel function of the first kind of order l, l is the number of topologi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/36
CPCG01P3/36
Inventor 高春清付时尧王彤璐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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