Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-11-12
1988-10-11
Noland, Tom
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
047774436
ABSTRACT:
Disclosed in a nuclear magnetic resonance (NMR) based inspection apparatus using an SQUID flux meter for detecting a small NMR signal, in which a receiving coil for receiving the NMR signal from an object is connected to a mixer, which mixes a reference high-frequency signal with the NMR signal so that the NMR signal is reduced to a low-frequency signal having a differential component of frequencies of both signals, and the low-frequency signal is applied to the input coil of the SQUID flux meter so that it is converted into a voltage signal. The mixer circuit includes Schottky diodes operative at a liquid helium temperature or Josephson junctions, and the portions of apparatus from the reception coil up to the SQUID flux meter are operated in a superconductive state at a liquid helium temperature.
REFERENCES:
patent: 4390840 (1983-06-01), Ganssen et al.
patent: 4585999 (1986-04-01), Hilbert et al.
patent: 4733182 (1988-03-01), Clarke et al.
Hilbert, C. et al., "Nuclear Quadrupole Resonance Detected at 30 MHZ with a DC Superconducting Interference Device" Appl. Phys. Lett. 47(6) 15 Sep. 1985.
Kohno Hideki
Matsui Shigeru
Nakane Hideaki
Ogura Yukiko
Onodera Takashi
Fess Lawrence G.
Hitachi , Ltd.
Noland Tom
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