Magnetostrictive sensing (MsS) technology utilizing ferromagnetic strip materials is widely used for guided wave testing of piping and plates. Due to the increasing demand in enhanced data acquisition and processing, such as phased array systems, sensors used for pipes are split into multiple segments to allow synthetic or dynamic focusing function. Adjusting this multi-segment concept for omni-directional operation on plates was found to be more challenging due to limited space and requirements to maximize signal-to-noise ratio (SNR) as well as signal purity and possibly a wider frequency range. New development in enhancing on omni-directional transducer was done. The transducers utilize a novel MsT magnetostrictive transduction coils arrangement that allows splitting the coils into small segments. The transducer was optimized for optimal energy conversion using iron cobalt (FeCo) alloy strip and also for operation in 150 – 500 kHz frequency range. Transducer performance and limitations will be discussed together with potential future applications.
1. P. Wilcox, M. Lowe, P. Cawley, “Omni -directional guided wave inspection of large metallic plate
structures using an EMAT array”, IEEE Trans. Ultrason. Ferroelectr. 52 (2005) 653– 665.
2. Seung HM, Kim HW, Kim YY, “Development of an omni -directional shear-horizontal wave
magnetostrictive patch transducer for plates,” Ultrasonics. 2013 Sep; 53(7):1304-8.
3. Kwun, et al. Method and apparatus generating and detecting torsional wave inspection of pipes or tubes,”
U.S. Patent 6429650 B1, August 6, 2002.
4. Vinogradov, S., “Method and S ystem for Generating and Receiving Torsional Guided waves in a
Structure,” U.S. Patent 7,821,258, B2, October 26, 2010.
5. S. Vinogradov, "Magnetostrictive Transducer for Torsional Mode Guided Wave in Pipes and Plates,"
Materials Evaluation, Vol. 67, N 3, 2009, pp. 333– 341.
6. S. Vinogradov, G. Light,, H. Kwun, D. Wagar, “Applications of MsT Probes for Guided Wave Testing of
Components,” Presented at the ASNT Spring 2012 Conference, Dallas, TX, 19 -23 March 2012.
7. Adam Cobb and Jay Fisher, “Defect Depth Sizing Using Guided Waves,” QNDE Review of Progress in
Quantitative Nondestructive Evaluation, Minneapolis, MN, July 26-31, 2015.
126 Page Views
0 PDF Downloads
0 Facebook Shares