Method for measuring the absorption of incident laser light by a material in different states of matter

By changing the laser parameters and combining numerical simulation, the absorption rate of the metallic material to the incident laser during the solid-liquid-vapor three-state evolution process is analyzed in reverse. This solves the problem that cannot be measured in the existing technology and realizes high-precision absorption rate measurement.

CN116698916BActive Publication Date: 2026-06-19BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Filing Date
2023-06-20
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies make it difficult to directly measure the absorption rate of incident laser light in metallic materials during the solid-liquid-vapor three-state evolution process, especially since they cannot identify the absorption situation in each state.

Method used

By changing parameters such as laser emission time, scanning speed, and defocusing amount, the absorption behavior of incident laser light on the material surface during the solid-liquid-vapor three-state evolution process is analyzed in reverse. Combining numerical simulation and experimental data, the average absorption rate of incident laser light on the material surface is calculated.

Benefits of technology

It enables high-precision absorption rate measurement of different physical states of metallic materials under different processing conditions. It is suitable for various materials, simple to operate and not limited by experimental conditions. It is suitable for measuring the absorption behavior of incident laser during the solid-liquid-vapor evolution process of various material surfaces.

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Abstract

This invention discloses a method for measuring the absorptivity of materials in different physical states to incident laser light, applicable to the field of laser material processing technology. The method includes the following steps: A laser is applied to the material surface using a thermal conductivity welding mode to perform a scanning welding experiment; the latent heat of fusion, latent heat of vaporization, and thermal conductivity absorptivity of the material are obtained after the experiment; the average absorptivity of the material surface to the incident laser during the emission time is calculated; the laser parameters are varied to obtain the average absorptivity under different conditions; based on the absorptivity under different conditions, the variation law of the proportion of the laser-induced solid phase time in the total emission time is calculated; based on the different proportions of the solid phase time in the total laser emission time, the absorption of the incident laser during the solid-liquid-vapor three-state evolution of the material surface is analyzed in reverse. This invention has the advantages of clear principle, simple operation, speed, and accuracy.
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