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Mechanical Engineering Commons

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1983

Engineering Physics

Articles 1 - 2 of 2

Full-Text Articles in Mechanical Engineering

The Maximum Entropy Formulation Of Inverse Problems Of Nde, R. M. Bevensee Jan 1983

The Maximum Entropy Formulation Of Inverse Problems Of Nde, R. M. Bevensee

Review of Progress in Quantitative Nondestructive Evaluation

This paper introduces the Maximum Entropy method of resolving underdetermined objects (flaws or inclusions) by a physicists’ brand of nonlinear processing of the image data. We survey three areas of research: (1) synthetic aperture imaging to resolve three dimensional flaws, with the aid of selective back projection, (2) scattering from anomalies according to the inhomogeneous Fredholm integral equation of the second kind, and (3) ultrasonic flaw characterization by the boundary integral equation method. A simple example is offered to illustrate the potential resolving power of the ME method for problems in area (2). We present some criteria for effective ME ...


High Resolution Arma Model Reconstruction For Nde Ultrasonic Imaging, Yoh-Han Pao, Victor Chen, Ahmed El-Sherbini Jan 1983

High Resolution Arma Model Reconstruction For Nde Ultrasonic Imaging, Yoh-Han Pao, Victor Chen, Ahmed El-Sherbini

Review of Progress in Quantitative Nondestructive Evaluation

Ultrasonic imaging is of use in a number of important areas, including nondestructive testing and medicine. The field has grown considerably in the past ten years and remains an active and growing area of research. For nondestructive evaluation of materials (NDE), the aim is to provide means for obtaining estimates of the size, shape and orientation of flaws in sufficiently a quantitative manner so that failure of mechanical structural parts can be predicted.1,2 As an imaging technique, ultrasonic imaging is appropriate whenever the medium considered is opaque to other sources of radiation, such as optical radiation. It is ...