Guided Wave Techniques for Structural Health Monitoring
Summary
Guided wave techniques employ ultrasonic waves that propagate along and through structural elements to detect and characterise defects. By exciting and sensing specific wave modes—such as Lamb and shear horizontal modes—over long ranges, these methods can survey large areas with a sparse sensor network. Active approaches typically deploy piezoelectric transducers bonded or embedded to launch controlled wave packets and record their interactions with features such as cracks, corrosion, delaminations or voids. Signal analysis draws on time-of-flight measurements, dispersion curves and imaging algorithms to localise damage and assess its severity. Numerical modelling and finite-element simulation underpin mode selection and optimise transducer placement, while data-driven algorithms enhance sensitivity and automate feature extraction. Applications span aerospace panels, civil infrastructure and energy pipelines, offering real-time monitoring, reduced inspection costs and improved safety. Ongoing challenges include compensating for temperature and load variations, integrating sensor networks into complex geometries and developing robust probabilistic frameworks to quantify uncertainty in damage estimates.
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Guided Wave Techniques for Structural Health Monitoring publication trend
The graph below shows the total number of articles in guided wave techniques for structural health monitoring across all publications each year (not limited to Nature Index journals).
Technical terms
Guided wave: Ultrasonic mode confined by structural boundaries, enabling long-range interrogation.
Lamb wave: A guided wave mode in plates exhibiting symmetric and antisymmetric motion patterns.
Coda wave interferometry: A signal-processing method that analyses late-arriving scattered waves to detect minute changes in material properties.
Piezoelectric transducer: A sensor–actuator element that converts electrical signals to mechanical waves and vice versa via the piezoelectric effect.
Fluidic ultrasonic transducer: A non-contact source utilising fluid flow instabilities to generate ultrasonic bursts without solid radiators.
References
- Fluidic Ultrasound Generation for Non‐Destructive Testing. Advanced Materials (2024).
- Comparing the stretching technique and the wavelet cross-spectrum technique for measuring stress-induced wave-velocity changes in concrete. Automation in Construction (2024).
- Probabilistic residual strength assessment of smart composite aircraft panels using guided waves. Reliability Engineering & System Safety (2023).
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