Abstract
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 language | English |
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| Title of host publication | 1995 IEEE Ultrasonics Symposium, 1995. Proceedings |
| Publisher | IEEE |
| Pages | 803-806 |
| Number of pages | 4 |
| ISBN (Print) | 0780329406 |
| DOIs | |
| Publication status | Published - 1995 |
| Event | 1995 IEEE Ultrasonics Symposium - , United Kingdom Duration: 7 Nov 1995 → 10 Nov 1995 |
Conference
| Conference | 1995 IEEE Ultrasonics Symposium |
|---|---|
| Country/Territory | United Kingdom |
| Period | 7/11/95 → 10/11/95 |
Keywords
- 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