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10. Introduction

Author

Zevin, Lev S., Kimmel, Giora, Mureinik, Inez, Zevin, Lev S., Kimmel, Giora, and Mureinik, Inez, editor

Published
1995
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49. Powder Crystallography of Useful Materials Using Synchrotron Radiation

Author

J. Faber, Shiyou Pei, and James A. Kaduk

Subjects
National Synchrotron Light Source, Crystallography, Materials science, Synchrotron radiation, Crystallite, Phase analysis, Single crystal, Powder diffraction
Abstract

Although the title seems innocuous, it is intended to be deliberately provocative. When chemists think of powder diffraction, it is generally in the traditional sense of a tool for phase identification, and perhaps the determination of lattice parameters, semiquantitative phase analysis, or average crystallite size. Recent advances in software (particularly the Rietveld method) and the availability of synchrotron radiation have facilitated the extraction of accurate and precise structural information from powder diffraction data, information comparable to that obtained from a typical single crystal experiment. It is now possible to do “powder crystallography”, and not merely the traditional tasks of powder diffraction.

Published
1996

50. Depth-Selective Squid Eddy Current Techniques for Second Layer Flaw Detection

Author

John P. Wikswo and Yu Pei Ma

Subjects
Materials science, Lap joint, law, Acoustics, Rivet, Eddy current, Penetration (firestop), Phase analysis, Penetration depth, Excitation, Magnetic field, law.invention
Abstract

Detecting hidden damage at the second layer of lap joint structures in aircraft by using eddy current techniques is difficult because the cracks are usually located beneath the head of the rivets, which cause large signals that mask the relatively smaller signals from the second layer cracks. In addition, using lower frequency excitation for deeper penetration of the eddy currents reduces the signal-to-noise ratio. Several new techniques have been tried, such as using a sheet inducer to increase the penetration depth or using sensors that have a frequency independent response, to improve the signal to noise ratio [1, 2]. To better extract the information due to the cracks beneath the rivet at the second layer, we have developed a phase analysis of the magnetic field produced from the eddy currents induced by the sheet inducer.

Published
1996

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