Phase-correction algorithm of deformed grating images in the depth measurement of weld pool surface in gas tungsten arc welding

摘要

The principle and system structure of the depth measure-ment of weld pool surface in tungsten insert gas (TIG) welding are first introduced in the paper, then the problem of the common phase lines is studied. We analyze the causes and characteristics of the phase lines, and propose a phase correction method based on line ratio. The paper presents the principle and detail processing steps of this phase correc-tion algorithm, and then the effectiveness and processing characteristics of the algorithm are verified by simulation. Finally, the algorithm is applied to phase processing in the depth measurement of the TIG weld pool sur-face and Obtains satisfying results.