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Use the photoelectric device-linear CCD as a measurement tool, and use the SCM for the data acquisition and data processing, a diameter measurement system which is a low costing, high-precision, non direct contact, can be created. The system can provide diameter real-time monitor to pipe production process.doi:10.4028/www.scientific.net/amm.602-605.1984 fatcat:2qarehq6pzbujol7ezpbsiiks4