Multichannel fiber laser acoustic emission sensor system for crack detection and location in accelerated fatigue testing of aluminum panels
| Autor: | Peter Finkel, Marriner H. Merrill, Geoffrey A. Cranch, Joseph D. Hart, William R. Pogue, Caitlin R. S. Williams, Meredith N. Hutchinson |
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| Rok vydání: | 2020 |
| Předmět: |
lcsh:Applied optics. Photonics
Sensor system Imagination Materials science Computer Networks and Communications Acoustics media_common.quotation_subject Bandwidth (signal processing) lcsh:TA1501-1820 chemistry.chemical_element Multilateration Laser Atomic and Molecular Physics and Optics law.invention chemistry Acoustic emission Aluminium law Fiber laser media_common |
| Zdroj: | APL Photonics, Vol 5, Iss 3, Pp 030803-030803-10 (2020) |
| ISSN: | 2378-0967 |
| DOI: | 10.1063/1.5133040 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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