Presenter Information

Derek J. Sturges, General Electric

Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

By comparison with the detection of the presence of a discontinuity, the inverse process of attempting to define the characteristics of the discontinuity which led to that indication is fraught with difficulty. Detection requires only that the ultrasonic indication is clearly distinguishable from other signals attributable to electronic or material “noise”. That is, it is confined to a relatively short time period, and exhibits a signal-to-noise ratio significantly larger than unity. However, both the signal and the noise are functions of numerous parameters, and, for inversion to be accurate and unambiguous, the inspection process would have to provide as many independent pieces of data as there are independent factors contributing to the signal (and to the noise, too, if its nature is such that it is added coherently to the signal from the discontinuity).

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 9: Systems, Process Control, and Reliability

Pages

2373-2380

DOI

10.1007/978-1-4615-2848-7_300

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Probabilistic Approach to Ultrasonic Flaw Size Estimation

La Jolla, CA

By comparison with the detection of the presence of a discontinuity, the inverse process of attempting to define the characteristics of the discontinuity which led to that indication is fraught with difficulty. Detection requires only that the ultrasonic indication is clearly distinguishable from other signals attributable to electronic or material “noise”. That is, it is confined to a relatively short time period, and exhibits a signal-to-noise ratio significantly larger than unity. However, both the signal and the noise are functions of numerous parameters, and, for inversion to be accurate and unambiguous, the inspection process would have to provide as many independent pieces of data as there are independent factors contributing to the signal (and to the noise, too, if its nature is such that it is added coherently to the signal from the discontinuity).