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The evaluation method of the bolt conclusion for ultrasonic waves using reflection coefficient S 11 of scattering parameter was proposed. Ultrasonic waves of 2 MHz were used because variation of reflection coefficient S 11 was the greatest. Reflection coefficient S 11 was decreased as the axial force was increased. Usefulness of the evaluation method of the bolt conclusion using reflection coefficient S 11 was demonstrated.

A Study of Bolt Conclusion Evaluation for Ultrasonic Waves Using Scattering Parameter