Study of influences of laser power fluctuation on thermogram of the material

✍ Scribed by Xueqin Wei; Qiguang Zheng; Jianhui Gu; Zaiguang Li

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 194 KB
• Volume: 32
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(00)00044-x

✦ Synopsis

The eects of the laser beam instability on the temperature of the material are studied in this paper. The ¯uctuation of the temperature not only relates to the laser beam instability, but also correlates with the thermal conductivity, the thermal diusivity, the emissivity, the laser±solid interaction time, and the laser spot diameter. The temperature ¯uctuation of the aluminum, the polymethylmethacrylate, the epoxylite, and the low carbon steel is measured by the infrared thermal imagers (HWRXÁÁ) to determine validity of the theory prediction. It is found that the theoretical prediction is in good agreement with the experimental results. Besides, the maximum amplitude of the temperature ¯uctuation is calculated and how to control the temperature ¯uctuation is discussed. The results show that the temperature ¯uctuation in the laser±solid interaction is of importance in practice.