Proximity fuse
Abstract
Abstract A proximity fuse comprising at least two frequency selective amplifiers having different band-pass characteristics and both receiving the same input signals. The first amplifier, having the narrower band-pass filter, will activate a detonator upon receipt of a signal which lies within the pass-band of said filter and which exceeds a given value. If a signal appears in the pass-band of the second amplifier which has the broader pass-band, and said signal exceeds a certain level, the output of said second amplifier will change said level which a signal in said first amplifier must exceed in order to activate the detonator. The output terminal of said first amplifier is connected to a first level detector, and the output terminal of said second amplifier is connected to a second level detector. Said first and second level detectors are interconnected so that the threshold value of said first level detector is changed in pace with the output signal from said second level detector when the latter detector receives a signal from the second amplifier. In order to prevent the proximity fuse from coming into operation until after a certain time after the launching of a projectile, the second level detector comprises delay elements. These delay elements are also utilized to prolong the change of the threshold value of the first level detector after said signal in the pass-band of said second amplifier has vanished.
Inventors
- 👤 Bjorn Dahl
Bibliographic Details
Claims Analysis
Total Claims: 9References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |