1. P3F-1 Lamb Wave Generation with an Air-Coupled Piezoelectric Array Using Different Square Chirp Modulation Schemes
- Author
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M.J. Garcia-Hernandez, Juan A. Chávez, Antoni Turo, Jordi Salazar, Y. Yañez, and M. Garcia-Rodriguez
- Subjects
Physics ,Lamb waves ,Transducer ,Amplitude ,Pulse compression ,business.industry ,Acoustics ,Nondestructive testing ,Chirp ,Chirp spread spectrum ,Ultrasonic sensor ,Physics::Atomic Physics ,business - Abstract
This paper describes a new Lamb wave excitation technique using square chirp signals for air-coupled inspection of laminate materials in a non destructive testing system. The airborne ultrasonic waves are generated with an air-coupled ultrasonic plane array transducer with 15 active elements. Each array element is excited with a square chirp signal in order to apply pulse compression techniques. The advantages of using chirp signals are a greater SNR when using pulse compression (compared with burst or single pulse), a more precise time of flight calculation and a greater use of the transducer bandwidth. However, a decrease in the signal amplitude is expected due to the dispersion of the Lamb waves.
- Published
- 2007
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