NMR frequency locking circuit
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United States of America Patent
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-
Nov 24, 1992
Grant Date -
N/A
app pub date -
Nov 7, 1990
filing date -
Nov 7, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An NMR locking mechanism for use with not only electromagnets, superconducting magnets and permanent magnets, but also with ultrahigh energy product magnets such as neodynium. The circuit utilizes a single conversion superheterodyne receiver with a phase locked loop that forms a locking mechanism that depends upon a variable frequency. The resonant frequency of the nuclei is compared to a variable excitation frequency which is adjusted to maintain a control frequency with one unique value of the control frequency being zero at lock.
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