A novel fibre optic acoustic emission sensor

Research output: Contribution to journalArticle

Authors

  • P Theobald
  • M Gower
  • Jonathan Burns
  • E Fernandes
  • G Bryce

Colleges, School and Institutes

Abstract

This paper presents the design, theory, characterisation and application of a novel fibre optic acoustic emission (AE) sensor. The sensor consists of a pair of optical fibres that are heated, fused and drawn to create a fused-tapered region that is sensitive to acoustic perturbations. The sensor is housed in a silica V-groove. The modelling of this fibre optic AE sensor is presented with a finite element analysis on the strain field based on the effect of the geometry within the sensing region. The characterisation of the sensor was carried out using a glass block with 160mm thickness as an acoustic medium. The applications of this sensor were demonstrated in three experiments. Firstly, the sensor was surface-mounted in carbon fibre reinforced composite samples and tested to failure under tensile loading. In the second experiment, the sensor was surface-mounted on double-cantilever Mode-I test specimens. The AE response from the sensor was correlated to the inferred modes of failure during the Mode-I test. In the third experiment, the sensor was surface-mounted onto the composite "blow-off" test samples. The feasibility of using the sensor to detect damage development in real-time was demonstrated.

Details

Original languageEnglish
Article number693237
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6932
Publication statusPublished - 1 Jan 2008
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems , 2008 - San Diego, United States
Duration: 9 Mar 2008 → …

Keywords

  • NDT, acoustic emission, blow-off test, ultrasound sensor, damage detection, composite