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一、前言激光检测技术是激光应用的一个重要组成部分。激光技术与光学、精密机械、电子和计算机结合起来,使激光检测技术进入了全盛时期。激光热波、热象技术是两年前新出现的一种无损检测技术,它是用激光短脉冲瞬时对样品局部加热,然后检测辐射的热波或热象,达到检测缺陷的目的。用于检测电路焊接质量的技术已仪器化,应用在流水线生产中。美国Vanzetti Systems 公司和DataProbe 公司,瑞典Semyre 电子公司等已研制出检测设备。国内也已开始这方面的工作。本篇文章主要说明激光检测电路焊接质量的工作原理。当用脉冲激光照射焊点时,其温度就会升高。温度升高的大小与焊接表面的状况关系很大,不同的表面状况吸收激光能量的能力不一样。另外,温度升高的大小也与焊点的自身因素有关,例如焊接物质的数量,相
I. Introduction Laser detection technology is an important part of laser applications. Laser technology, combined with optics, precision mechanics, electronics and computers, has brought laser inspection technology to its heyday. Laser thermal wave, thermal imaging technology is a newly emerged two years ago, a non-destructive testing technology, which is a short pulse laser instantaneous heating of the sample local, and then detect the heat wave or thermal radiation, to detect defects. The technology used to test the quality of the circuit soldered has been instrumented and used in assembly line production. The United States Vanzetti Systems and DataProbe company, Sweden Semyre Electronics and other companies have developed testing equipment. We have also started work in this area in our country. This article describes the principle of laser welding quality testing circuit. When pulsed laser irradiation spot, the temperature will rise. The magnitude of the temperature increase is strongly related to the condition of the welding surface, and the ability of the different surface conditions to absorb the laser energy is not the same. In addition, the size of the temperature increase is also related to the solder joint itself factors, such as the number of welding material, phase