基于热成像的激光固态相变过程温度控制方法  

Thermal imaging-based temperature control method for laser solidstate phase transformation process

作　　者：张群莉 李天璐[1,2] 陈智君 项思远 吴国龙[1,2,3] 林学春 姚建华 ZHANG Qunli;LI Tianlu;CHEN Zhijun;XIANG Siyuan;WU Guolong;LIN Xuechun;YAO Jianhua(Institute of Laser Advanced Manufacturing,Zhejiang University of Technology,Hangzhou 310023,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Zhejiang Provincial Innovation Center of Laser Intelligent Equipment Technology,Wenzhou 325013,China;Laboratory of All-Solid-State Light Sources,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China)

机构地区：[1]浙江工业大学激光先进制造研究院,浙江杭州310023 [2]浙江工业大学机械工程学院,浙江杭州310023 [3]浙江省激光智能装备技术创新中心,浙江温州325013 [4]中国科学院半导体研究所全固态光源实验室,北京100083

出　　处：《红外与激光工程》2024年第12期63-74,共12页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2023YFB4603400);浙江省"尖兵"攻关计划项目(2022C03021,2023C01064,2024SJCZX0040);龙游县重大科技攻关计划项目(JHXM2023072)。

摘　　要：在激光固态相变过程中,温度对于工件性能有着显著影响,温度控制的精度和响应速度是确保工件强化质量的关键因素。为了提高激光强化过程中温度的稳定性,基于热成像原理,采用红外热像仪获取激光作用区域不同位置的实时温度数据,提出一种模糊自适应并行PID控制方法,开发模糊控制模块,通过比较激光作用区域前后位置的温度差,经模糊控制系统处理生成控制输出,与模糊PID控制器并行控制,通过实时监测,反馈控制激光输出功率,实现更快速、精准的温度控制。通过实验对系统仿真结果进行验证,结果表明该温控方法不仅提高了温度控制的响应速度和精度,还增强了系统的鲁棒性,为高端装备关键零部件的高质量表面强化提供参考。Objective In the process of laser solid-state phase transformation,the temperature has a significant impact on the performance of the workpiece,and the accuracy and responsiveness of temperature control are the key factors to ensure the quality of workpiece hardening.During this process,multiple variables,such as laser output power,scanning speed,and spot size,affect the temperature within the laser-affected zone of the workpiece.In addition,material attributes like composition,geometry and surface roughness also affect the temperature of laser solidstate phase transformation,and the surface temperature of the material is also affected by environmental condition and unpredictable elements like heat dissipation.Critical to the process is maintaining the temperature of the material above its austenitizing temperature and below the melting point.Insufficient temperature will inhibit the phase transformation,while excessive heat induces surface melting.And a stable temperature will contribute to the formation of a uniform phase transformation hardened layer.Thus,in order to improve the quality of solidstate laser phase transformation,developing a real-time temperature controller is necessary.Methods A fuzzy adaptive parallel PID control method based on thermal imaging temperature measurement technology was proposed.It integrates surface sensor technology to capture temperature information across the camera's visual spectrum,and an additional fuzzy control module is introduced on top of the fuzzy PID control.This design empowers the system to evaluate temperature discrepancies across diverse points within the laser's action zone.These differential values are subsequently funneled into a fuzzy logic system,which operates concurrently with the fuzzy PID controller to jointly adjust the laser output power.This dual-control mechanism ensures rapid and meticulous temperature regulation,thereby improving control and an enhancing quality of intensification.Results and Discussions The simulation and experimental validations o

关 键 词：激光固态相变 热成像 温度控制 模糊控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]