Abstract:
A capacitive pressure sensor (100) includes a substrate wafer (114) and a diaphragm wafer (112). The substrate wafer defines a substrate recess (R") with a first depth (D2). The diaphragm wafer defines a diaphragm recess (R"') with a second depth (D3). The diaphragm wafer is bonded to the substrate wafer such that the substrate and diaphragm recesses form a height differentiated pressure chamber (126).
Abstract:
A pressure sensor assembly (100) includes a pressure sensor (101) having a pressure sensing transducer connected to a plurality of electrode pins (103) via a plurality of electrode pads (105) disposed on the transducer, an inner casing (107) configured to hold the pressure sensing transducer including a plurality of inner casing electrode pin channels (111) having the electrode pins disposed therein. The pressure sensor further includes an outer casing (115) holding the inner casing therein having a capsule header (117) with a plurality of capsule header electrode pin channels (119) defined therein which can include a ceramic seal (133) disposed therein such that the capsule header electrode pin channels engage the electrode pins in an insulating sealed relationship. The outer casing further includes an isolator plate (127) including an isolator plate fluid port (129) defined therein and a pressure isolator (131) disposed on the isolator plate and configured to deflect in response to a change in ambient pressure. The pressure sensor includes a pressure transmitting fluid disposed in the fluid volume.
Abstract:
A system for determining in-plane acceleration of an object. The system includes an in-plane accelerometer with a substrate rigidly attached to an object, and a proof mass-formed from a single piece of material-movably positioned a predetermined distance above the substrate. The proof mass includes a plurality of electrode protrusions extending downward from the proof mass to form a gap of varying height between the proof mass and the substrate. The proof mass is configured to move in a direction parallel to the upper surfaces of each of the plurality of substrate electrodes when the object is accelerating, which results in a change in the area of the gap, and a change in capacitance between the substrate and the proof mass. The in-plane accelerometer can be fabricated using the same techniques used to fabricate an out-of-plane accelerometer and is suitable for high-shock applications.
Abstract:
A system for determining in-plane acceleration of an object. The system includes an in-plane accelerometer with a substrate rigidly attached to an object, and a proof mass-formed from a single piece of material-movably positioned a predetermined distance above the substrate. The proof mass includes a plurality of electrode protrusions extending downward from the proof mass to form a gap of varying height between the proof mass and the substrate. The proof mass is configured to move in a direction parallel to the upper surfaces of each of the plurality of substrate electrodes when the object is accelerating, which results in a change in the area of the gap, and a change in capacitance between the substrate and the proof mass. The in-plane accelerometer can be fabricated using the same techniques used to fabricate an out-of-plane accelerometer and is suitable for high-shock applications.