脉冲激光辐照瓷质绝缘子表面损伤试验研究

Experimental Study on Surface Damage of Ceramic Insulators Irradiated by Pulsed Laser

为防止激光清洗瓷质绝缘子过程中基底发生损伤,开展激光辐照下瓷质绝缘子损伤试验。采用1064 nm脉冲激光辐照于瓷质绝缘子表面,探究不同能量密度、脉冲个数以及不同辐照时间下瓷质绝缘子的损伤规律,并对瓷质绝缘子表面开展振镜扫描试验,利用图像法确定瓷质绝缘子的激光损伤阈值。试验结果表明,激光定点辐照下,随着激光能量密度的提高、脉冲数的增加、辐照时间的增加,绝缘子表面坑洞直径逐渐增大,最后趋于定值,约为聚焦光斑直径的1.3倍;减小扫描速度,损伤形貌由斑点状变化至条纹状,粗糙度随能量密度的增大、速度的减小而增大;基于图像法的瓷质绝缘子损伤判据,得到损伤能量密度阈值。

In order to prevent the damage of insulator base during laser cleaning,the damage test of ceramic insulator under laser irradiation was carried out in this paper.A 1064 nm pulsed laser was irradiated on the surface of a porcelain insulator to explore the damage rule of the porcelain insulator under different energy density,pulse number and irradiation time.A scanning test was carried out on the surface of the porcelain insulator,and the laser damage threshold of the porcelain insulator was determined by image method.The experimental results show that with the increase of laser energy density,pulse number,and irradiation time,the diameter of insulator surface pit gradually increases and finally tends to a constant value,which is about 1.3 times of the diameter of focused spot.When the scanning speed decreases,the damage morphology changes from speckle to stripe,and the roughness increases with the increase of energy density and the decrease of velocity.Based on the damage criterion of porcelain insulator with image method,the damage energy density threshold was obtained.