Systems and methods for common mode signal cancellation in press detectors

摘要

Certain implementations of the disclosed technology may include systems, methods, and apparatus for common mode signal cancellation in force change detectors. An example embodiment of the disclosed technology includes a press sensor element configured to reduce or eliminate thermally induced signals. The sensor element includes a piezoelectric layer that includes a first surface in communication with a first layer. The first layer includes a first conductive region. The piezoelectric layer includes a second surface in communication with a second layer. The second layer includes a second conductive region, a third conductive region, and a non-conductive void region separating the second conductive region and the third conductive region. The second and third conductive regions are configured to substantially reduce a thermally-induced voltage change between two or more of the first, second and third conductive regions responsive to a corresponding temperature change of at least a portion of the piezoelectric layer.

主权项

1. A sensor element comprising:
a piezoelectric layer including:
a first surface in communication with a first layer, the first layer comprising a first conductive region, wherein the first conductive region substantially covers the first surface; anda second surface in communication with a second layer, the second layer comprising:
a second conductive region;a third conductive region, wherein an area of the third conductive region is configured in size relative to an area of the second conductive region; anda non-conductive void region separating the second conductive region and the third conductive region; the respective areas of the second and third conductive regions configured to substantially reduce a thermally-induced voltage change between two or more of the first, second and third conductive regions responsive to a corresponding temperature change of at least a portion of the piezoelectric layer.