C9-a5 - Optimization of Low-Frequency Shear Wave Transducers for Guided Wave Applications
- Event
- 2025 ICU PADERBORN - 9th International Congress on Ultrasonics
2025-09-21 - 2025-09-25
Paderborn - Band
- Lectures
- Chapter
- C9-a - NDT and NDE Transducers
- Author(s)
- M. M. Narayanan, M. Nicolai, J. Prager - Federal Institute for Material Research and Testing (BAM), Berlin (Germany)
- Pages
- 223 - 226
- DOI
- 10.5162/Ultrasonic2025/C9-a5
- ISBN
- 978-3-910600-08-9
- Price
- free
Abstract
Development of ultrasonic transducers for the excitation of a torsional mode T(0,1) mode in a large pipe of the material typical of actual oil/gas pipelines is discussed. Towards this, 16 ultrasonic transducers are designed and fabricated using shear plates of PIC 255 material, backing mass of tungsten-epoxy composite and brass shims as wear plates. The transducers are qualified using Laser Doppler Vibrometry. Then, the transducers are embedded in a springloaded ring and tested on a pipe using a multi-channel ultrasonic system. The results show the successful excitation of T(0,1) mode and it is seen to propagate for distance of 60 m with a good SNR.