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Vol.10 No.2previousAA148-NT90

Academic Articles
Regular Paper Vol.10 No.2 (2018) p.1 - p.8

A consideration on the use of shear waves to improve the sensitivity of an optical ultrasonic sensor for under-sodium viewers

Koichi SARUTA1,3,*, Takuma SHIRAHAMA2, Toshihiko YAMAGUCHI3, and Masashi UEDA3
1 Applied Laser Research Group, Applied Laser and Innovative Technology Institute, Japan Atomic Energy Agency, 65-20 Kizaki, Tsuruga, Fukui 914-8585, Japan
2 Tsuruga Office, NESI Inc., 2-1 Shiraki, Tsuruga, Fukui 919-1279, Japan
3 Sodium Technology Development Group, Fast Reactor Plant Technology Development Department, Japan Atomic Energy Agency, 1 Shiraki, Tsuruga, Fukui 919-1279, Japan
The present work is intended to investigate shear waves induced on stainless steel diaphragms by the incidence of ultrasonic waves, with the main emphasis on the understanding of the generation mechanism of the resultant second wave, in order to explore the possible use of the shear waves for improvement of the sensitivity of an optical ultrasonic sensor used for under-sodium viewers. The response of the diaphragms exposed to ultrasonic waves with different pressure profiles is measured by a heterodyne interferometer to examine the location where the shear waves are excited. The generation of the second wave is interpreted on the basis of interference of these shear waves. The effectiveness of the use of the shear waves is demonstrated by an improved sensitivity of 0.26 nm/kPa for a 3-mm-diameter and 5-µm-thick diaphragm. This sensitivity is approximately 7 times as high as the sensitivity achieved with the first wave, which is the displacement of the diaphragm caused by directly incident ultrasonic waves.
Optical ultrasonic sensor, Optical pressure sensor, Optical hydrophone, Under-sodium viewer, Fast reactor
Full Paper: PDF EJAM Vol.10 No.2 pp.1- "A consideration on the use of shear waves to improve the sensitivity of an optical ultrasonic sensor for under-sodium viewers"

Article Information
Article history:
Received 18 April 2018
Accepted 24 August 2018