Gradiometer readout circuit employing phase locked multiplier circuit loops
Abstract
Abstract IN A GRADIOMETER READOUT CIRCUIT EXHIBITING INCREASED SIGNAL-TO-NOISE RATIO, EXTENDED DYNAMIC RANGE AND SIMPLIFIED OPERATION PROVIDING FOR BOTH ANALOG AND DIGITAL OUTPUT INFORMATION, THERE IS DISCLOSED TWO PHASE-LOCKED LOOP X32 MULTIPLIERS ADAPTED TO RECEIVE MAGNETOMETER SIGNALS F1 AND F2 FROM TWO SPACED APART MAGNETOMETERS. ONE OF THE MULTIPLIERS IS OF A NOVEL OFF-SET TYPE FOR PREVENTING THE GENERATION OF A ZERO BEAT SIGNAL IN THE EVENT THE MAGNETOMETERS'' SIGNALS APPROACH EQUALITY. THE MULTIPLIED INPUT SIGNALS ARE MIXED AND THEN FURTHER MULTIPLED BY AN X16 MULTIPLIER. PROVISIONS ARE INCLUDED AT THE OUTPUT OF THE X16 MULTIPLIER AND ONE OF THE X32 MULTIPLIERS FOR THE CONVERSION OF GRADIOMETER AND MAGNETOMETERS FOR THE CONOF HIGH SENSITIVITY FOR PROVIDING THE INFORMATION FOR RECORDING IN EITHER OR BOTH DIGITAL AND ANALOG FORM.
Inventors
- 👤 George R Huggett
Bibliographic Details
Claims Analysis
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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 |