Side band detection system for nuclear magnetic resonance flowmeters
Abstract
Abstract PARAMAGNETIC FLUID FLOWING THROUGH A CONDUIT, WHICH HAS BEEN PREVIOUSLY POLARIZED BY A MAGNETIZING FIELD, IS TAGGED BY ROTATING THE POLARIZATION DIRECTION IN SPACED BOLUSES OF THE FLUID. AT A DETECTION STATION LOCATED DOWNSTREAM FROM THE TAGGING STATION, MEANS IS PROVIDED FOR OSCILLATING THE DIRECTION OF POLARIZATION WITH AN AUDIO FREQUENCY SIGNAL, WITHIN A SPACE OCCUPIED BY CROSSED STEADY STATE AND R.F. MAGNETIC FIELDS TO INDUCE NUCLEAR MAGNETIC RESONANCE. THE DETECTION OF A TAGGED BOLUS IS REALIZED BY THE PRODUCTION OF SIGNALS AT A FREQUENCY REPRESENTING A SIDE BAND OF THE R.F. FREQUENCY, SPACED FROM THE R.F. FREQUENCY BY THE FREQUENCY OF THE AUDIO SIGNAL, WHICH IS COMPLETELY SEPARATED FROM THE R.F. SIGNAL BY MEANS OF FILTERS.
Inventors
- 👤 William H Vander Heyden
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |