Method for measuring vibration target displacement based on laser speckles and system thereof

Abstract

The embodiment of the invention discloses a method for measuring vibration target displacement based on laser speckles and a system thereof, relates to the vibration object displacement measurement technology, and can accurately measure the displacement of the vibration object. Light energy from an imaging component and a reflecting mirror is evenly distributed on the CCD light-sensitive surface of a photoelectric detection component to present multiple speckles and cause interference. The measured object moves in the vibration process. Speckle images are computed so as to obtain vibration information of the measured object. Interference images are computed so as to obtain overall information of vibration and displacement of the measured object. Then the two groups of information is combined to compute the displacement information of the measured object. The method and the system are mainly used for measuring the displacement of the vibration target.

Description

technical field [0001] The invention relates to the technical field of displacement measurement of vibrating objects, in particular to a method and system for measuring the displacement of a vibrating target based on laser speckle. Background technique [0002] When the laser is irradiated on the inhomogeneous medium, the diffuse reflection light interferes in the space around the medium, producing strong light spots and weak light spots in the space, and if a screen is used to receive these light spots, it will form spots with different intensities on the screen , these spots are called laser speckle. Laser speckle carries the surface information of the object, including position, shape and other information. By analyzing the laser speckle field, the above information and its change information of the measured object can be obtained. Using laser speckle to measure object information has the advantages of non-contact measurement, full-field measurement, and simple measureme...

AI Technical Summary

Problems solved by technology

[0003] The current technologies for measuring the position or deformation information of an object based on laser speckle include the use of laser speckle to measure the small displacement of the object, the use of laser speckle to measure the small deformation of the object, the use of laser speckle to measure the micro vibration of the object, etc., and the existing methods only It can measure objects within a distance of 1m. The range of motion of objects is required to be on the order of microns, and the requirements for environmental stability are relatively high, which limits the application range of this type of measurement method.

To measure the position or surface information of an object under certain environmental conditions such as vibration, long-distance and other special conditions, the current method is difficult to complete the measurement work

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