| 摘要 |
An impulse sensor comprises a first Piezo electric disc (25) with two oppositely polarized halves disposed symmetrically about a reference plane including the rib (26) of a thin wall of the transducer container vessel and pressed onto the thin wall, and a second Piezo electric disc (29) with the same polarization for both halves disposed symmetrically about the reference plane and pressed onto a rigid wall of the transducer container vessel. The impulses transversely acting on an impulse receiving member extending from the thin wall generate electric signals of high signal-to-noise ratio from the first Piezo electric disc (25) and electric signals of low signal-to-noise ratio from the second Piezo electric disc (29). The electric signals from the two Piezo electric discs are combined to cancel noises and extract refined signals representing the impulses.
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