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Title: DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers

A spectrometer for measuring the nuclear quadrupole resonance spectra or the zero-field nuclear magnetic resonance spectra generated by a sample is disclosed. The spectrometer uses an amplifier having a dc SQUID operating in a flux-locked loop for generating an amplified output as a function of the intensity of the signal generated by the sample. The flux-locked loop circuit includes an integrator. The amplifier also includes means for preventing the integrator from being driven into saturation. As a result, the time for the flux-locked loop to recover from the excitation pulses generated by the spectrometer is reduced. 7 figures.
Inventors:
;
Issue Date:
OSTI Identifier:
5299940
Assignee:
Univ. of California, Oakland, CA (United States) PTO; EDB-94-047024
Patent Number(s):
US 5254950; A
Application Number:
PPN: US 7-759997
Contract Number:
AC03-76SF00098
Resource Relation:
Patent File Date: 13 Sep 1991
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; NMR SPECTROMETERS; DESIGN; AMPLIFIERS; NMR SPECTRA; SQUID DEVICES; ELECTRONIC EQUIPMENT; EQUIPMENT; FLUXMETERS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; SPECTRA; SPECTROMETERS; SUPERCONDUCTING DEVICES; 440800* - Miscellaneous Instrumentation- (1990-); 665412 - Superconducting Devices- (1992-)