Application example of industrial digital camera in digital speckle system

With the development of modern measurement technology, digital image correlation method has been used as a good method for optical measurement, and is commonly used in the field of experimental solid mechanics. Speckle images refer to a class of images with random speckle distribution structures. Speckle refers to Random spot structure in the image. Speckles can be generated by interference of laser light on diffuse reflective surfaces (laser speckles); they can also be formed by spraying different coatings (such as glass bead paint or spray paint) on the surface of the specimen (artificial speckles); even some materials Surface patterns (such as granite, etc.) can also directly form speckles (natural speckles). Digital speckle correlation technology based on non-optical speckles collects surface images before and after deformation of an object, and uses the correlation between randomly distributed speckles on the surface of the object before and after deformation to determine the uniqueness and strain of the object surface to achieve the measurement of the object deformation field It can be used to measure the deformation of the surface of large structures and material specimens, and to obtain the surface strain distribution.

Two-dimensional digital speckle correlation deformation measurement system

In a typical two-dimensional digital speckle-related deformation measurement system assisted by Weishi Image in a university, an LED light source is used as the lighting system, a 1280 * 960 resolution 120W Gigabit interface CCD camera, and a 25mm fixed-focus C-mount lens. In the effective measurement distance of 0.5-2.5m, it can achieve a measurement area of 50 * 70mm² ~ 250 * 350mm², and achieve a maximum accuracy of 150με.

industrial camera

Pictures of the system and the video camera

Speckle deformation synchronization image

Synchronize images during deformation

At present, this technology has gained widespread attention in scientific research and practical applications. With the support of the high stability and high service quality of Jingke Zhizhi hardware products, I believe that it can achieve considerable development in the future.