کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
295555 511556 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Application of Golay codes to improve the dynamic range in ultrasonic Lamb waves air-coupled systems
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Application of Golay codes to improve the dynamic range in ultrasonic Lamb waves air-coupled systems
چکیده انگلیسی

Air-coupled ultrasonic systems are usually limited by poor signal-to-noise ratios. The use of pulse compression techniques based on Golay codes can help to improve the ultrasound signal-to-noise ratio. This type of codes allows virtually side lobe free operation and causes the cancellation of self-induced noise. This paper proposes the use of Golay sequences to code Lamb waves excited in thin materials with a NDT system based on air-coupled piezoelectric arrays. Furthermore, a system for the generation of Lamb waves modulated by 16-bits Golay codes is also proposed. Successful results are presented in copper plates. An improvement in signal-to-noise ratio up to 21 dB is achieved when compared with conventional pulse transmission.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: NDT & E International - Volume 43, Issue 8, November 2010, Pages 677–686
نویسندگان
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