Detection method and device for laser shock wave space-time distribution characteristic

Abstract

The invention discloses a detection method and device for laser shock wave space-time distribution characteristic. The detection method and device includes a laser shock processing module, a laser beam expanding system, an analog signal acquisition system and a post-processing system, wherein the laser shock processing module is the most basic configuration of laser shock processing and includes a laser, a numerical control work table, heat insulation aluminium foil, energy absorption coating and a resistant layer, the beam expanding system is composed of inversion Galileo telescopes and the analog signal acquisition system includes a distributed piezoelectric sensor and laser energy meter. According to the invention, piezoelectric principles are applied to the field of laser shock processing and measurement problems of laser shock wave space-time distribution information in the field are solved.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a detection method and device for the space-time characteristics of laser shock waves. Background technique [0002] Laser shock processing (LSP) is an advanced processing technology that emerged with the gradual development of laser technology in the 1960s. The shock wave generated by laser irradiation on the surface of solid materials is used to shock the surface of the material, thereby improving the fatigue life of the material. Abrasion and corrosion resistance. Since the laser pulse width used for laser processing is very short (generally on the order of nanoseconds) and the amplitude of the induced shock wave is very high (generally on the order of GPa), it is difficult to detect the spatiotemporal distribution of shock waves. The existing technology uses PVDF piezoelectric sensors to detect laser-induced shock waves, but it can only reflect the temporal characteristics of...

AI Technical Summary

Problems solved by technology

Since the laser pulse width used for laser processing is very short (generally on the order of nanoseconds), and the amplitude of the induced shock wave is very high (generally on the order of GPa), it is difficult to detect the spatiotemporal distribution characteristics of the shock wave.

The existing technology uses PVDF piezoelectric sensors to detect laser-induced shock waves, but it can only reflect the temporal characteristics of shock waves as a whole, and cannot reflect the impact of the spatial distribution of laser pulse energy on the temporal and spatial characteristics of shock waves.

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