J0420207 線集束型空気結合超音波センサーによる効率的円周Lamb波の励起([J042-02]超音波計測・解析法の新展開(2),機械材料・材料加工部門)
詳細
Efficient transduction of a circumferential (C-) Lamb waves by a pair of noncontact air-coupled ultrasonic transducers (NAUT) was presented. A line focus type (LFT-) of the NAUT was employed for the efficient transduction of the C-Lamb wave, which was designed so as to take an almost same angle of the incident longitudinal beam on the circular pipe surface. Outstanding characteristics of the LFT-NAUT for the C-Lamb wave transduction were theoretically and experimentally shown in comparison to those of the conventional plane type (CPT-) NAUT.
