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US 5,174,158 AGranted
Resistive strain gauge pressure sensor
AssigneeMacLean-Fogg Company
InventorJames R. Kremidas
Life of this patent
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AssigneeMacLean-Fogg Company
InventorJames R. Kremidas
Estimating the term…
A resistive strain gauge pressure sensor including upper and lower housings coacting to define a pressure chamber within the housing. A board member is clamped between the housings and defines a diaphragm portion which extends across the pressure chamber to divide the pressure chamber into upper and lower chamber portions. All of the circuitry of the sensor is screen printed onto the lower planar face of the board member including the various resistor elements of the strain gauge assembly, the various elements of the conditioning circuit receiving the output of the strain gauge assembly, and the various further leads required to connect the circuitry elements to the terminals of the sensor. The sensor terminals are provided by a plurality of connector pins extending downwardly through the board member for connection at their respective lower ends to the circuitry provided on the lower face of the board member.
A resistive strain gauge pressure sensor including a diaphragm exposed to a pressure to be sensed, a resistive strain gauge assembly positioned on the diaphragm and operative to generate an output signal in response to flexing of the diaphragm, and a conditioning circuit receiving the output signal from the strain gauge assembly and operative to generate a sensor output signal, characterized in that the sensor includes a board member having a relatively thin portion defining a diaphragm portion and a relatively thick portion defining a substrate portion, the board defines a generally flat planar surface including one side surface of the diaphragm portion and one side surface of the substrate portion, the strain gauge assembly is positioned on said one side surface of said diaphragm portion, the conditioning circuit is positioned on said one side surface of said substrate portion, and the sensor further includes a plurality of connector pins extending through said substrate portion and terminating proximate said flat planar surface to define terminals for connection to said conditioning circuit and said strain gauge assembly.
A transducer comprising:
A resistive strain gauge pressure sensor comprising:
A differential pressure sensor including a housing defining a pressure chamber, a diaphragm extending across the chamber to divide the chamber into an upper chamber portion in communication with a first fluid pressure and a lower chamber portion in communication with a second fluid pressure, and a resistive strain gauge assembly positioned on the diaphragm and operative in response to flexing of the diaphragm to generate an output signal proportional to the pressure differential between the upper and lower chamber portions, characterized in that the housing further defines an instrumentation chamber laterally displaced from and sealed from the pressure chamber, the sensor includes a board member extending laterally within the housing and including a relatively thin diaphragm portion constituting the diaphragm of the sensor and a relatively thick substrate portion extending across the instrumentation chamber, the strain gauge assembly is positioned on the diaphragm portion with the pressure chamber, and the sensor further includes a conditioning circuit positioned on the substrate portion within the instrumentation chamber and electrically connected to the output of the strain gauge assembly.
Dependencies are inferred from the claim text.