| 摘要 |
A system is provided for selectively detecting and indicating impacts on a base surface, said system comprising at least one detector unit and at least one indicator unit. Said detector unit comprises one or more capacitors between the plates of which an elastic material is inserted, the distance between said capacitor plates as well as the dynamic spring rate of the elastic material being adjusted to the type of impact to be detected and/or the nature of the base surface, and said detector unit is connected to a voltage source via a resistor having high resistance which is chosen with respect to the speed of the impacts to be detected. Said indicator unit comprises an amplifier connected to the detector unit in such a way that each capacitor in the detector unit actuates the indicator unit, said amplifier amplifying pulses from the detector unit, and a switching means which is connected to the output of the amplifier and which, upon receipt of a pulse from the amplifier, delivers a signal to one or more indicator means during a properly adjusted time.
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