Impulse sensor with mechanical preamplification

Details Impulse sensor with mechanical preamplification Impulse sensor with mechanical preamplification

1987-03-30

1988-10-11

Levy, Stewart J.

Measuring and testing

Dynamometers

Responsive to force

7386122, 7386123, 7386124, G01L 116, G01F 132

Patent

active

047762225

ABSTRACT:
This invention discloses an impulse sensor that detects change in force imposed on a force receiving member extending from the impulse sensor, which comprises a force receiving member extending from a thin flange forming a portion of the container vessel enclosing at least two Piezo electric elements wherein the first of the two Piezo electric elements disposed in an off-set relationship with respect to the central axis of the force receiving member is under a pressurized contact with the thin flange, while the second of the two Piezo electric elements disposed in a symmetric arrangement about the central axis of the force receiving member is under a pressurized contact with a rigid portion of the container vessel. The first Piezo electric element detects the impulses received by the force receiving member and other noise impulses transmitted through the container vessel wall while the second Piezo electric element detects the same noise impulses as those detected by the first Piezo electric element. The two electric signals respectively generated by the two Piezo electric elements are combined and processed in such a way that the noises are cancelled and the signals representing the impulses received by the force receiving member are delivered.

REFERENCES:
patent: 2250496 (1941-07-01), Postlethwaite
patent: 4258565 (1981-03-01), Sawayama et al.
patent: 4262544 (1981-04-01), Herzl
patent: 4625564 (1986-12-01), Murakami et al.

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