Scale transform signal processing for optimal ultrasonic temperature compensation

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 59; no. 10; pp. 2226 - 2236
• Main Authors: Harley, J. B., Moura, J. M. F.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustics; Algorithms; Computation; Computer programs; Exact sciences and technology; Ferroelectric materials; Fourier transforms; Fundamental areas of phenomenology (including applications); Measurement and testing methods; Optimization; Physics; Signal processing; Signal Processing, Computer-Assisted; Silicon carbide; Solid mechanics; Structural and continuum mechanics; Temperature; Temperature compensation; Temperature measurement; Transforms; Ultrasonography - methods; Temperature measurement; Thermal compensation; Structure integrity; Guided wave; Signal processing; Thermal wave; Scale factor; Experimental study; Monitoring
• ISSN: 0885-3010; 1525-8955; 1525-8955
• DOI: 10.1109/TUFFC.2012.2448

In structural health monitoring, temperature compensation is an important step to reduce systemic errors and avoid false-positive results. Several methods have been developed to accomplish temperature compensation in guided wave systems, but these techniques are often limited in computational speed. In this paper, we present a new methodology for optimal, stretch-based temperature compensation that operates on signals in the stretch factor and scale-transform domains. Using these tools, we demonstrate three algorithms for temperature compensation that show improved computational speed relative to other optimal methods. We test the performance of these algorithms using experimental guided wave data.