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

Abstract

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
Patent Number(s):
5254950 A
Application Number:
PPN: US 7-759997
Assignee:
Univ. of California, Oakland, CA (United States)
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
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-)

Citation Formats

Fan, N Q, and Clarke, J. DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers. United States: N. p., 1993. Web.
Fan, N Q, & Clarke, J. DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers. United States.
Fan, N Q, and Clarke, J. Tue . "DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers". United States.
@article{osti_5299940,
title = {DC superconducting quantum interference device usable in nuclear quadrupole resonance and zero field nuclear magnetic spectrometers},
author = {Fan, N Q and Clarke, J},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {10}
}