Speckle manufacturing method based on transfer print technology

Abstract

The invention provides a speckle manufacturing method based on a transfer print technology. The method includes the steps that the size, the number, the deformation and other parameters of speckles are input through computer software, so that two or more pairs of speckle images are generated; digital speckle correlation operation is performed on all the speckle images through the software, and the speckle image highest in speckle matching degree is selected according to the calculation result; the selected speckle image is printed; the speckle image is cropped according to the size of an object to be detected; the speckle image is arranged on the surface of the object to be detected in a transfer print mode through the transfer print technology, so that the object, to be detected, including the selected speckle image is obtained. The speckle manufacturing method has the advantages of being easy and rapid to manufacture, convenient to operate, high in precision, low in price and wide in application range.

Description

technical field [0001] The invention relates to a speckle production method based on transfer printing technology, which belongs to the fields of photomechanics, deformation measurement and engineering detection. Background technique [0002] The digital speckle correlation method was proposed by I.Yamaguchi of Japan and W.H.Peter and W.F.Ranson of the University of South Carolina in the United States in the 1980s. I.Yamaguchi used the peak value of the cross-correlation function to measure the light intensity before and after the deformation of the object to derive the displacement of the object when studying the small deformation of the object. Yamaguchi uses double-beam illumination and places the image sensor in the normal direction of the illumination point. He deduces the relationship between the deformation of the object and the speckle displacement in the diffraction field, performs correlation calculations on the diffraction light field before and after loading, der...

AI Technical Summary

Problems solved by technology

This method of making speckles has large particles and strong randomness. The quality of speckles usually depends on the technical level of the creators, and the objects to be tested are often reworked.

In addition, there are chemical vapor deposition and ultraviolet lithography. These methods are complicated to make speckles, and the speckle particles are difficult to control.

However, the solution silver plating method, electron beam exposure method, focused ion beam etching and other production methods are not suitable for promotion because of the small production area and high price.

Images