Instantaneous rotational speed measuring method, device and system based on no-diffraction light beams

A technology of non-diffracted beam and instantaneous rotation speed, which is applied to devices using optical methods, etc., can solve the problems of cumbersome installation and adjustment, complex optical path system, and great influence on measurement accuracy, and achieves simple optical path, simplifies optical path system, and reduces clamping requirements. Effect

Inactive Publication Date: 2015-02-18
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to: aim at the problems existing in the prior art, to provide a method, device and system for measuring instantaneous rotational speed based on non-diffracting light beams, an

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  • Instantaneous rotational speed measuring method, device and system based on no-diffraction light beams
  • Instantaneous rotational speed measuring method, device and system based on no-diffraction light beams
  • Instantaneous rotational speed measuring method, device and system based on no-diffraction light beams

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Embodiment

[0040] The invention relates to a method for measuring instantaneous rotational speed based on a non-diffraction beam. The non-diffraction beam is used to irradiate the surface of a rotary part, and the Doppler effect generated by the scattered laser beam on the irradiated surface under the action of the rotational speed is used to measure the rotary part by heterodyne interference. Instantaneous speed, the method specifically includes the following steps:

[0041] (1) The single-wavelength laser beam is collimated and expanded, and then divided into a first laser beam and a second laser beam perpendicular to each other, wherein the optical path of the first laser beam remains unchanged.

[0042] (2) Changing the optical path of the second laser beam so as to be parallel to the optical path of the first laser beam.

[0043] (3) Processing the first laser beam and the second laser beam into non-diffraction beams respectively, and irradiating them on the rotating part to be test...

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Abstract

The invention provides an instantaneous rotational speed measuring method, device and system based on no-diffraction light beams, relates to the technical field of rotation speed measurement and solves the problem that an optical path system of an existing laser rotational speed measuring instrument is complicated, defocusing has great effects on measuring accuracy and assembly and adjustment are complicated. The technical scheme includes that the no-diffraction light beam irradiates on the surface of rotating members, laser beams are scattered on the irradiated surface to generate the Doppler effect under the action of the rotational speed, and heterodyne interferometer of instantaneous rotational speed of rotary parts is performed. By the instantaneous rotational speed measuring method, device and system, non-contact dynamic high-precision measurement of the instantaneous rotational speed of the rotary parts can be realized, and assembly and adjustment are facilitated. In addition, the instantaneous rotational speed measuring method, device and system is applicable to research and real-time monitoring of dynamic rotation characteristics of the rotary parts.

Description

technical field [0001] The invention relates to the technical field of rotational speed measurement, in particular to an instantaneous rotational speed measurement method, device and system based on a non-diffraction beam. Background technique [0002] The laser speed measurement technology measures the speed through the Doppler effect caused by the rotation speed of the laser spot irradiated on the surface of the measured object. In the measurement of the rotational speed of the rotating part, the main factors affecting the measurement are the focus size of the laser spot and the defocus caused by the vibration deviation of the rotating part. Under the condition of the same rotation speed of the tested rotating parts, increasing the depth of field of the optical system and reducing the size of the laser spot can ensure the measurement accuracy and reduce the clamping requirements. [0003] The optical system of the current laser speed measuring instrument generally uses a ...

Claims

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Application Information

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IPC IPC(8): G01P3/36
Inventor 马国鹭赵登峰曾国英
Owner SOUTHWEAT UNIV OF SCI & TECH
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