Ultrasonic defect detection in jet-engine alloys is often a hunt for a flaw response in the presence of microstructural noise. Signal-to-noise ratios (S/N) are often used to quantify the extent to which the response from a defect or reference reflector stands out above the competing noise. In many cases of practical interest the microstructural scattering is 'weak' in the sense that single-scattering events dominate and multiple scattering may be ignored. In such cases, independent-scatterer noise models apply and can be used to develop simple, approximate formulas for S/N. For pulse-echo (P/E) inspections, the formulas relate S/N to the response-weighted volume of the incident sonic pulse, and these formulas have proven useful in designing P/E inspections of jet-engine forgings. After briefly reviewing the P/E case, we introduce generalized versions of the formulas which apply to ultrasonic pitch-catch inspections. The use of the new formulas to assess inspections is then discussed, including a treatment of phased-array inspections using so-called dynamic depth focusing.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Estimates of signal-to-microstructural-noise ratios in ultrasonic inspections of metals


    Additional title:

    Abschätzung des Mikrogefüge-Signal-Rausch-Verhältnisses bei der Ultraschallprüfung von Metallen


    Contributors:


    Publication date :

    2006


    Size :

    8 Seiten, 3 Bilder, 8 Quellen





    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




    Estimates of Small Signal/Noise Ratios

    Howard, L. D. | NTRS | 1985


    Real-time evaluation of ultrasonic weld inspections

    Brown, L.M. / DeNale, R. | Tema Archive | 1992


    Probability of detection for applied ultrasonic inspections

    Burkel, R.H. / Sturges, D.J. / Tucker, W.T. et al. | Tema Archive | 1996


    Pipeline girth weld inspections using ultrasonic phased arrays

    Moles, M. / Dube, N. / Labbe, S. et al. | Tema Archive | 2004


    Ultrasonic phased arrays for pipeline girth weld inspections

    Moles, M. / Dube, N. / Russell, M. | Tema Archive | 2000