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Proceedings Paper

Propogation loss with frequency of ultrasound guided waves in a composite metal-honeycomb structure
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Paper Abstract

Non-destructive testing of critical structural components is time consuming, while necessary for maintaining safe operation. Large aerospace structures, such as the vertical stabilizers of aircraft undergo inspection at regular intervals for damage diagnostics. However, conventional techniques for damage detection and identification before repair can be scheduled are conducted off-line and therefore can take weeks. The use of guided ultrasound waves is being investigated to expedite damage detection in composites. We measure the frequency dependent loss of ultrasonic guided waves for a structure comprising a boron-nitride composite skin sandwiching an aluminum honeycomb. A wide range of ultrasound frequencies propagate as measured using PZTs, with the lowest attenuation observed about 200-250 kHz. These measurements are confirmed using optical fiber Bragg grating arrays used as ultrasound transducers.

Paper Details

Date Published: 6 May 2009
PDF: 7 pages
Proc. SPIE 7314, Photonics in the Transportation Industry: Auto to Aerospace II, 73140P (6 May 2009); doi: 10.1117/12.835473
Show Author Affiliations
Indu F. Saxena, Intelligent Optical Systems, Inc. (United States)
Harsh K. Baid, Univ. of California, Los Angeles (United States)
Narciso Guzman, Intelligent Optical Systems, Inc. (United States)
Lothar U. Kempen, Intelligent Optical Systems, Inc. (United States)
Ajit Mal, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 7314:
Photonics in the Transportation Industry: Auto to Aerospace II
Alex A. Kazemi; Bernard C. Kress, Editor(s)

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