Masters Theses

Abstract

"The construction and performance of a system to generate pulsed magnetic field gradients for use with a commercial superconducting NMR spectrometer for the purpose of molecular self-diffusion measurements is described. Types of coils that provide linear field gradients are discussed. The design and construction of a conventional Helmholtz pair is outlined. A procedure to estimate the magnitude of the field gradients generated by the Helmholtz coils is explained. The design of a circuit to generate fast current pulses using a power MOSFET has been detailed and compared with a functionally similar circuit using bipolar power transistors. The performance of the design has been evaluated and discussed.

A 15-turn Helmholtz pair with a separation distance of 16 mm constructed on a 12 mm glass form was used for the self-diffusion experiments. 28 gauge enameled copper wire (diameter = 0.3211 mm) was used for the coils. Magnetic field-gradients of the order of 8 G/cm/A were experimentally determined. The current pulse generator produced current pulses up to a maximum amplitude of 17.5 A with the worst case rise and fall times of 40 μs and 24 μs respectively"--Abstract, page ii.

Advisor(s)

Dawson, Darrow Finch, 1931-2007

Committee Member(s)

Wilson, Edward A.
Blum, Frank D.
Ho, C. Y. (Chung You), 1933-1988

Department(s)

Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering

Publisher

University of Missouri--Rolla

Publication Date

Fall 1989

Pagination

vii, 62 pages

Note about bibliography

Includes bibliographical references (pages 54-55).

Rights

© 1989 Saumil Shirish Mehta, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 5978

Print OCLC #

21311931

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