Double-rotation optical wedge space phase shift method used for cutting speckle interference

Abstract

Disclosed is a double-rotation optical wedge space phase shift method used for cutting speckle interference. The double-rotation optical wedge space phase shift method used for cutting speckle interference is designed aiming at the dynamic measurement of plane deformation in the speckle interference measurement. Double holes are added in an imaging optical path, carrier frequency is introduced, thus the space phase shift requirements required by the phase extracting algorithm are met. A gap between the two holes is changed, the distance between adjusting imaging lens and an image plane is adjusted, thus control of size of phase shit quantity of the space can be achieved. Rotable and adjustable double optical wedges are arranged on the position of any one hole of the double holes. One beam of light ray of two beams of light rays passing the double holes deflects, thus two speckle fields on the image plane are caused to be mutually cut. A whole refraction angle of combining the double optical wedges is changed by revolving one of the optical wedges or by the relative revolving of the two optical wedges, thus regulation of the size of the cutting quantity is achieved.

Description

technical field [0001] The invention relates to the technical field of out-of-plane deformation measurement, which can be used for stress deformation or thermal deformation detection on the surface of an object. The out-of-plane deformation measurement usually adopts digital shear speckle interferometry. The problem of dynamic measurement of surface deformation. Background technique [0002] In the field of out-of-plane deformation measurement technology, digital shear speckle interferometry is one of the most commonly used measurement methods. In order to calculate the phase information of the measured object, the phase shift method is usually required. Among them, the phase shift method is divided into two kinds: time phase shift method and space phase shift method. Knowing the phase difference, the phase information to be measured is obtained by collecting 3 or more images and solving the equations simultaneously, which requires the measured object to remain stable durin...

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Problems solved by technology

[0003] The purpose of the present invention is to study the method of introducing linear carrier frequency and shear amount adjustment in the spatial phase shift digital shearing speckle interferometry, which is used to solve the measurement problem of rapid stress deformation or dynamic deformation in the digital shearing speckle interferometry, Provide a solution that can achieve spatial carrier frequency phase shift and shear amount adjustable, that is, a dual rotating optical wedge spatial phase shift method for shear speckle interference

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