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20 January 1997 Die Parting welt marks' measurement using structured laser analysis
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Heating and cooling air for an aircraft interior is transported using metal ducts. These ducts vary in size from a few centimeters to twelve centimeters in diameter. In the assembly of aircraft air ducts, coupling is swaged onto the ducts. In assuring the mechanical dies are operating properly the die parting welt mark is inspected. The current method of visual inspection and checking with calipers does not allow implementation of statistical process control methods. In an effort to improve this process check, a new measurement method is being developed. A feasibility study indicated that a structured light laser system would be a good approach. A few requirements are: it must be portable to be used at different locations within the fabrication area, it must be fast, it should be easy to use by the mechanic, the reading must be accurate, a hard copy print out is required, and it must be non-destructive. Due to the mechanical configuration of the duct and coupling, a camera with magnification optics is used. The measurement of the bump has a maximum height of 50.8 microns. The prototype systems uses computer vision and custom software written in the C language. This paper discusses different measurement methods tested and the benefits of each technology. The development of a specialized system is justified for production use. This paper describes the prototype system and some of its configuration for factory testing.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dennis P. Sarr and Joey H. Mullen "Die Parting welt marks' measurement using structured laser analysis", Proc. SPIE 2909, Three-Dimensional Imaging and Laser-Based Systems for Metrology and Inspection II, (20 January 1997);


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