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Optimum Detection of Ultrasonic Echoes Applied to the Analysis of the First Layer of a Restored Dome

Abstract

Optimum detection is applied to ultrasonic signals corrupted with significant levels of grain noise. The aim is to enhance the echoes produced by the interface between the first and second layers of a dome to obtain interface traces in echo pulse B-scan mode. This is useful information for the restorer before restoration of the dome paintings. Three optimum detectors are considered: matched filter, signal gating, and prewhitened signal gating. Assumed models and practical limitations of the three optimum detectors are considered. The results obtained in the dome analysis show that prewhitened signal gating outperforms the other two optimum detectors.

References

  1. 1.

    Gosálbez J, Salazar A, Bosch I, Miralles R, Vergara L: Application of ultrasonic nondestructive testing to the diagnosis of consolidation of a restored dome. Materials Evaluation 2006,64(5):492-497.

  2. 2.

    Gustafsson MG: Nonlinear clutter suppression using split spectrum processing and optimal detection. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 1996,43(1):109-124. 10.1109/58.484470

  3. 3.

    Scharf LL: Statistical Signal Processing. Addison-Wesley, Reading, Mass, USA; 1991.

  4. 4.

    Vergara L, Gosálbez J, Fuente JV, Miralles R, Bosch I: Measurement of cement porosity by centroid frequency profiles of ultrasonic grain noise. Signal Processing 2004,84(12):2315-2324. 10.1016/j.sigpro.2004.07.025

  5. 5.

    Vergara L, Páez JM: Backscattering grain noise modelling in ultrasonic non-destructive testing. Waves in Random Media 1991,1(1):81-92. 10.1088/0959-7174/1/1/008

  6. 6.

    Narayanan VM, Molthen RC, Shankar PM, Vergara L, Reid JM: Studies on ultrasonic scattering from quasi-periodic structures. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 1997,44(1):114-124. 10.1109/58.585205

  7. 7.

    Ericsson L, Stepinski T: Algorithms for suppressing ultrasonic backscattering from material structure. Ultrasonics 2002,40(1–8):733-734.

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Author information

Correspondence to Luis Vergara.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://doi.org/creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Keywords

  • Information Technology
  • Quantum Information
  • Practical Limitation
  • Ultrasonic Signal
  • Optimum Detector