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Vibration test three-dimensional deformation measuring device based on laser speckle interference

A technology of vibration test and three-dimensional deformation, which is used in measurement devices, vibration tests, and optical devices to avoid measurement errors.

Active Publication Date: 2018-04-06
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology

[0007] The object of the present invention is to provide a vibration test three-dimensional deformation measurement device and method based on laser speckle interference, which overcomes the defects of the existing technical means in vibration deformation measurement, improves the speckle interferometry method, and utilizes the double exposure method to build The three-dimensional speckle interference optical path, the chopper is used to realize the time-division gating of the beam, and the rapid measurement of the three-dimensional deformation field under vibration conditions is realized

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  • Vibration test three-dimensional deformation measuring device based on laser speckle interference
  • Vibration test three-dimensional deformation measuring device based on laser speckle interference
  • Vibration test three-dimensional deformation measuring device based on laser speckle interference

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Embodiment Construction

[0033] The measurement device consists of laser 2, high-speed camera 1, optical system, computer and measurement software: laser 2 uses a 532nm single longitudinal film Nd:YAG laser; high-speed camera 1 is used to collect speckle images; computer is used to store speckle images ; The measurement software uses the speckle interference fringe image collected by the high-speed camera to calculate the three-dimensional deformation; the optical system such as figure 1 , 2 As shown, the beam of the laser is divided into five paths by the beam splitter multiple times, and the deformation measurements in the x, y, and z directions are carried out respectively, where the z direction is the direction perpendicular to the high-speed camera 1, and the direction pointing to the high-speed camera 1 is positive; the x direction is the horizontal direction, positive as figure 1 shown; the y direction is determined by the right-hand rule; the origin is the center of the surface of the tested ...

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Abstract

A vibration test three-dimensional deformation measuring device based on laser speckle interference is characterized by comprising a high-speed camera 1, a laser 2, and a chopper 7, wherein light emitted from the laser 2 is split by a beam splitter A3 into a light beam A, then is split by a beam splitter B4 into a light beam B, and finally is split by a beam splitter C5 into a light beam C and a light beam D. The chopper 7 drives circular blades to rotate about a central axis by using a motor. Five light outlets are disposed in one group. Every two adjacent groups has an interval of 90 degrees, the angle A = angle B = angle C = 15 degrees. The light beam A is shared by the x direction and the z direction and is emitted from the light outlet X1. The light beam B is a z-direction measuring light beam and is emitted from the light outlet Z. The light beam C is a y-direction measuring light beam and is emitted from the light outlet Y. The light beam D is an x-direction measuring light beamand is emitted from the light outlet X2.

Description

technical field [0001] The invention belongs to the field of measuring devices, and in particular relates to a three-dimensional deformation measuring device and method for a vibration test based on laser speckle interference. Background technique [0002] At present, the measurement of vibration test is mainly limited to single-point position measurement. Due to the relationship between measurement methods, the whole-field deformation measurement is mostly static measurement. There are mainly the following types: dynamic measurement of single point and single direction through laser vibrometer; static and dynamic measurement of deformation in one direction through strain gauge; static measurement through phase speckle interference. [0003] Most laser vibrometers use heterodyne measurement technology, which is based on the principle of laser Doppler to determine the vibration velocity of the measuring point by measuring the Doppler frequency shift of the laser light wave re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01M7/02
CPCG01B11/162G01M7/00
Inventor 孙增玉刘柯袁媛高越刘华
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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