| 摘要 |
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. |
