Electricity: measuring and testing – Particle precession resonance – Using a magnetometer
Patent
1986-03-25
1988-03-22
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a magnetometer
324311, 324322, 307306, 331107S, G01R 3308
Patent
active
047331828
ABSTRACT:
An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.
REFERENCES:
patent: 3725819 (1973-04-01), Fulton
patent: 4039856 (1977-08-01), Schlig
The Art of Electronics, P. Horowitz et al., Cambridge University Press 1980.
Nucleus Quadrupole Resonance Detected at 30 MHz with a SQUID, Appl. Phys. Lett. 47(6) Sep. 1985, pp. 637-639.
Clarke John
Hahn Erwin L.
Hilbert Claude
Sleator Tycho
Arana Louis M.
Clouse, Jr. Clifton E.
Gaither Roger S.
Hightower Judson F.
Levy Stewart J.
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