Dr. Yuji Okamoto Profile

Dr. Yuji Okamoto

at Sumitomo Heavy Industries Ltd

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Proceedings Article | 6 November 2018 Paper

Robustness evaluation of the non-contact inner diameter measuring device with micrometer order accuracy

Toshiyasu Mitsunari, Yuji Okamoto, Itta Nozawa, Kazunori Yamazaki

Proceedings Volume 10819, 1081908 (2018) https://doi.org/10.1117/12.2501020

KEYWORDS: Cameras, Inspection, Distortion, Manufacturing, Measurement devices, Optical simulations, Reliability, Optical fibers, Quality measurement

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In recent years, high-speed inspection using non-contact measurement has been increasingly desired in the field of manufacturing. Inner diameter measurement of a cylindrical part is also the same. One of the promising methods for the non-contact inner diameter measurement is the light sectioning method using a ring beam device which consists of a conical mirror and a laser diode. However, further investigation is needed when it comes to practical use at the manufacturing site, especially for the requirement of measuring accuracy of micron order. We have been developing an inner diameter measuring device using the ring beam sectioning method with accuracy on the order of micrometers, aiming at the practical use at the production site. One of the features of our system is the robustness against the relative positional deviation between the workpiece and the sensor probe. Robustness is very important for the use at the production site. In this paper, we report on its evaluation results. We designed and manufactured the ring beam device so that the ring beam is uniform and exits horizontally from the conical mirror for the sake of achieving high accuracy and robustness. We created a simulation model for robustness evaluation by using the measured characteristics of the ring beam. Against the misalignment of central axis between the workpiece and the sensor probe, measurement dependency of less than 0.2 um/mm was obtained. And less than 0.1 um/min was obtained against the angular misalignment. We are also conducting experimental verification, and discuss the difference between the simulation and the experiment.

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