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29 January 2008 Experimental research on dimensional measurement of hot parts based on CCD
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Dimensional measurement of hot parts, such as forgings, is desirable to permit real-time process measure and control, but typically it is not convenient as a result of the difficulty in working with very hot workpieces. On the contrary, the disadvantage of high temperature of the hot parts can properly be used to measure the dimensions based on CCD (Charged Coupled Device) sensors. It is well known that the hot parts can transmit lights, so the general CCD can be applied to measure the dimensions of the hot part (e.g. length and diameter etc.) rapidly and non-contact without any illuminator. Since the illumination system can be omitted, the measurement system can be more flexible and convenient. In this paper the principle of the measurement based on CCD is briefly described at first. Then the structure of measurement system is presented in detail. At last, some experiments are performed to measure the diameter of hot parts. The experimental results indicate that the measured diameter is correlated with the luminance of hot parts and the luminance has something to do with the temperature of the hot parts, and the methods to avoid this question are discussed. In addition, the error sources in the measurement system are also discussed. From these experiments, the method to measure the dimension of hot parts based on inexpensive CCD sensor is feasible.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juan Wang, Zuron Qiu, and Jin Li "Experimental research on dimensional measurement of hot parts based on CCD", Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68291D (29 January 2008);

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