Parts inspection by laser beam heat injection |
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| Affiliation: | 1. Florida International University, Department of Civil and Environmental Engineering, Miami, FL, USA;2. Mersin University, Environmental Engineering Department, Mersin, Turkey;3. Florida International University, Department of Mechanical and Materials Engineering, Miami, FL, USA;1. Institute of Biotechnology, University of Helsinki, FIN-00014 Helsinki, Finland;2. Intramural Research Program, National Institute on Drug Abuse, Baltimore, MD 21224, USA;3. Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, Tallinn 12618, Estonia;1. National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510641, China;2. Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;1. Chair of Materials Science, Otto Schott Institute of Materials Research, Friedrich-Schiller-University Jena, Jena, Germany;2. Experimental Rheumatology Unit, Department of Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle,” Eisenberg, Germany;3. Thuringian Institute of Textile and Plastics Research, Rudolstadt, Germany;4. Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Jena, Germany;5. Jena School for Microbial Communication (JSMC), Friedrich-Schiller-University Jena, Jena, Germany;1. Department of Biomechatronic Engineering, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon, Republic of Korea;2. Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, USA |
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| Abstract: | When a pulse of laser radiation falls on a material surface, a certain amount of warming will occur which depends upon the surface properties of the material, particularly upon its absorptivity. The amount of warming will also depend upon what is underneath the surface and especially upon the amount of mass which is available for the thermal energy to expand into. If the warming process is monitored by an infrared detection system, one has a ready means of determining whether or not two parts are alike in their surface properties or in their internal features. An automatic, non-contact system is described which uses this principle for the inspection of solder joints on printed wiring boards at rates of up to 10 joints per second. With minor changes, the inspection system can be used to repair defective joints and to manufacture new ones by the reflow of solder paste or performs. Extensions of the inspection method are described with regard to the testing of bonds in metal sheets and to the measurement of paint thicknesses on metals. |
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