Piezoelectric driven unloaded pressure sensor专利检索-压电电阻器传感器与探测器专利检索查询-专利查询网

Piezoelectric driven unloaded pressure sensor

阅读：915发布：2021-08-17

专利汇可以提供Piezoelectric driven unloaded pressure sensor专利检索，专利查询，专利分析的服务。并且A d.c. voltage is applied through a series resistor to a capacitive piezoelectric device which is part of a cantilevered beam. The beam is thus made to deflect from a starting position until it contacts a grounded aneroid cell thereby partially discharging the piezoelectric device so that it moves back slightly toward the starting position sufficiently to break the ground contact. The capacitive piezoelectric device is thus alternately charged and discharged as the beam alternately makes and breaks ground by contact with the grounded aneroid cell. Since the expansion of the aneroid cell is in response to ambient pressure, the beam deflection as well as the voltage impressed across the piezoelectric device are related to ambient pressure.，下面是Piezoelectric driven unloaded pressure sensor专利的具体信息内容。

权利要求

1. A device for producing a signal proportional to pressure differential comprising: a beam adapted for deflecting along a line of action including a piezoelectric device having first and second terminals and at least mechanically integrated with said beam so that said beam is deflected along said line of action in response to voltage across said first and second terminals; a source of d.c. voltage having third and fourth terminals; first electrical means connecting said third terminal to said first terminal of said piezoelectric device; second electrical means connecting said fourth terminal to said second terminal of said piezoelectric device; a contact point which moves in response to deflection of said beam by an amount correlated to the deflection of said beam and along said line of action; third electrical means connecting said first terminal to said contact point; pressure sensing means which changes its physical extent in response to changes in differential pressure thereacross arranged in said line of action so as to be touched by said contact when said beam deflects, the change of physical extent of said pressure sensing means being correlated to the change in pressure thereacross; further means electrically connecting the portion of said pressure sensing means so touched with said fourth terminal; and, means for measuring the deflection of said beam.

2. The device of claim 1 wherein said pressure sensing means comprises an aneroid pressure cell having one end connected to a relatively immovable structure and a free end and an axis of physical change, said aneroid pressure cell being arranged so that its axis of physical change substantially coincides with said line of action through said contact so that said contact touches said free end when said beam is deflected.

3. The device of claim 1 wherein said first electrical means comprises a charge circuit having a time constant.

4. The device of claim 1 wherein said third electricAl means comprises a discharge circuit having a time constant.

5. The device of claim 1 wherein said means for measuring comprises a utilization means responsive to the voltage across said piezoelectric device.

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Piezoelectric driven unloaded pressure sensor

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