Developing Improved Nuclear Magnetic Resonance Marginal Oscillator Spectrometers for Advanced Teaching Laboratories

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Abstract:

Three marginal oscillator circuits are evaluated in their signal-to- noise performance in a complete nuclear magnetic resonance spectrometer. A circuit based on the hybrid Darlington source follower is superior to the other two, a modified Donnally oscillator and an FET cascade oscillator. Also the hybrid Darlington circuit has a voltage gain of 0.95 as compared, respectively, to 0.79 and 0.53 for the other two circuits. A sensitive but easy to understand phase sensitive detector of original design is presented as an integral part of the system, allowing simultaneous observation of the Lorentzian absorption signal and its derivative. Another new development is an external RF injection mode of operation of the marginal oscillators which permits observation of easily saturated NMR lines. Using this system, the variation of proton line widths in water as a function of the concentration of paramagnetic CuSO4 in the water is presented. Theses.

Author(s):
Willingham, Frank P.
Author Organization(s):
ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA
Descriptive Note:
Final rept. 2 Jun 1986-28 Oct 1988
Supplementary Note:
Master's Thesis.
Pagination:
0058

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
MILPERCEN
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_5_Command and Control; JCA_5.1.1_Establish and Maintain Unity of Effort with Mission Partners; JCA_5.1_Organize; JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_6.1.3_Switching and Routing; JCA_6_Net Centric; JCA_5.3_Planning; JCA_1.2.1_Training; JCA_6.1_Information Transport; JCA_6.3.3_Spectrum Management
Modernization Areas:
Microelectronics; Directed Energy
Communities of Interest:
Advanced Electronics
Descriptor(s):
*OSCILLATORS, *NUCLEAR MAGNETIC RESONANCE, PHASE DETECTORS, FIELD EFFECT TRANSISTORS, LABORATORIES, RADIOFREQUENCY, LINES(GEOMETRY), SIGNAL TO NOISE RATIO, EDUCATION, THESES
Field(s)/Group(s):
Atomic and Molecular Physics and Spectroscopy
Report Date:
1988 Dec 01