Detection of ultrasonic lamb waves in composite plates using optical-fibres

Anthony Gachagan, Stephen Pierce, WR Philp, A McNab, Gordon Hayward, Brian Culshaw

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

15 Citations (Scopus)


This paper presents experimental results for a new condition monitoring system that uses a combination of piezoelectric and fibre-optic technologies as the active and passive elements respectively. Composite plate samples have been manufactured containing two groups of optical-fibres (typically four strands per group) embedded across the length of the plate. Polyimide coated 4/125 μm single-mode glass fibre has been utilised and connected to a portable 633 nm Mach-Zehnder fibre interferometer for signal demodulation and subsequent data acquisition. For this present work, 1-3 connectivity piezocomposite transducers have been used to generate a known Lamb wave within carbon fibre reinforced composite plate (CFRP) structures. The S0 mode was selected due to the relatively large in-plane motion and low dispersion characteristics. Results using both externally surface bonded fibres and embedded fibres are presented, for a range of defective plates. Defects ranging from 1 mm diameter holes through to significant delaminations have been detected at an ultrasonic operating frequency of 285 kHz
Original languageEnglish
Title of host publication1995 IEEE Ultrasonics Symposium, 1995. Proceedings
Number of pages4
ISBN (Print)0780329406
Publication statusPublished - 1995
Event1995 IEEE Ultrasonics Symposium - , United Kingdom
Duration: 7 Nov 199510 Nov 1995


Conference1995 IEEE Ultrasonics Symposium
Country/TerritoryUnited Kingdom


  • optical-fibres
  • ultrasonic Lamb waves
  • composite plates
  • ultrasonic materials testing
  • Mach-Zehnder interferometers
  • carbon fibre reinforced composites
  • delamination
  • fibre optic sensors
  • flaw detection
  • intelligent sensors
  • piezoelectric transducers
  • surface acoustic wave transducers


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