Advanced Tomographic Imaging Methods for the Analysis of Materials
Abstract
Nuclear magnetic resonance (NMR) imaging is being vigorously pursued as a nondestructive characterization tool for materials. The promise of measuring spin concentration, molecular mobility (via the spin-lattice (T1) and spin spin (T2) relaxation times), and chemical structure (by largely unrealized localized spectroscopy techniques) at various locations within a sample has resulted in initial applications in a wide variety of nonmedical areas. Sizes have ranged from tree trunks of 25-cm diameter to 'microscopic' studies on millimeter-sized objects at 50-100 um resolution. Because standard NMR imaging techniques are limited to observing molecularly mobile components, applications to date have concentrated on bulk elastomers, solvent diffusion, and liquids in porous inorganic materials such as ceramics and oil cores. Techniques are being developed for imaging of highly rigid materials, which is the subject of other papers in this proceedings. For standard NMR imaging techniques, the primary requirement for increased resolution is powerful gradients.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1991
- Accession Number
- ADA241912
Entities
People
- Jerome L. Ackerman
- William A. Ellingson
Organizations
- Materials Research Society