GUIDED WAVE ULTRASOUND FIELD MAPPING USING A NETWORK OF REMOVABLE BRAGG GRATING TRANSDUCERS
- Conference date: 18–23 July 2010
- Location: San Diego, California, (USA)
Portable, in‐situ damage detection techniques for large structures during depot maintenance can find great utility if such capability can be realized, thereby saving considerable time and labor. Contemporary fixed location detection systems, such as the water‐coupled ultrasound imaging with the “squirter,” for instance require structural disassembly and transport to and from dedicated NDE system. For larger aircraft structures this can add weeks to the NDE process. An ultrasound field mapping method, using fiber Bragg gratings embedded in a flexible, removable sheet that can be re‐used over different structures, has been implemented. It is shown that this can be used to map guided wave ultrasonic fields over approximately 2 square feet area in a few tens of minutes. The test sample used is a composite skin with aluminum metal honeycomb of an aircraft structure. The data thus collected, comprising 612 locations over the area, can enable in‐situ damage detection once signal analysis algorithms are applied.
- Fiber Bragg gratings
- Image detection systems
- Nondestructive testing
- Ultrasonic transducers
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