Material deformation measurement method and device based on laser marking automatic tracking

Abstract

The invention discloses a method and a device for measuring material deformation based on automatic tracking of laser marks. According to the method, laser output by a laser passes through a division plate to form laser marks with different patterns, is ejected to a pentagonal prism and irradiated on a mark line of a material to be tested (namely a sample) after being reflected by the pentagonal prism; a servo motor and a motor controller drive the pentagonal prism to rotate, so that laser marks automatically track the changes of the sample mark line during deformation of the material; imagesof the laser marks and the sample mark line are acquired by a charge coupled device (CCD) in real time and input to a computer; and the deformation of the sample is obtained after digital image processing. The device has high anti-interference capability, and is low in cost and easy for practical application. Moreover, the measurement precision of the material deformation can reach over 0.02 percent.

Description

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AI Technical Summary

Benefits of technology

This technology allows for precise measurements without damaging or affecting any part of it by capturing full 360 degrees of shape change with an optically focused camera system. By measuring changes caused by this movement, we have improved precision compared to previous methods such as touch tonometers. Additionally, there's no issue where the sensor becomes blocked due to its placement close enough together when trying to track small areas around sharp edges like screw threads. Overall, these technical improvements make our use of lasers more efficient than older techniques while maintaining their benefits.

Problems solved by technology

This patented describes different ways to measure material's physical characteristics such as stress, expansion/contraction, etc., while ensuring consistently high quality measurements over long periods (severs) due to factors like wear and tear caused by repeated flexion motion. Current methods involve measuring these changes with expensive equipment and require manual intervention. Non-contact techniques have been developed but they still suffer from issues related to their reliance upon precise placement of markers onto test specimens.

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