Josephson junction Q-spoiler
US4733182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Mar 25, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0358
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.