Multichannel fiber laser acoustic emission sensor system for crack detection and location in accelerated fatigue testing of aluminum panels
Abstract
Detection and location of the source of acoustic emission in a thin aluminum panel is demonstrated using a multichannel fiber laser sensor system. Acoustic emission generated by a crack in an aluminum panel used as a test coupon in an accelerated fatigue experiment is detected and the location of the crack identified. Acoustic emission is detected over a bandwidth of around 0.5 MHz from a serially multiplexed array of four laser sensors and compared with measurements taken from four piezo-electric sensors co-located with the fiber laser sensors. The location of the crack is determined by first estimating time difference of arrival of signals at each sensor using a novel algorithm based on the cumulative distribution transform method with hyperbolic positioning. The fiber laser sensor is shown to match the signal-to-noise ratio of the industry standard (Mistras S9225) piezo-electric acoustic emission sensor.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 01, 2020
- Source ID
- 10.1063/1.5133040
Entities
People
- Caitlin R. S. Williams
- Geoffrey A. Cranch
- Joseph D Hart
- Marriner Merrill
- Meredith N. Hutchinson
- Peter Finkel
- William R. Pogue Iii
Organizations
- Office of Naval Research
- United States Naval Research Laboratory