Differential pressure sensor incorporating common mode error compensation
First Claim
1. A differential pressure sensor comprising:
- a sensor housing including a base plate having a hole therein, wherein a first side of the base plate is configured to be in fluid communication with a first fluid at a first pressure and a second side of the base plate is configured to be in fluid communication with a second fluid at a second pressure;
a first pressure sensing die assembly attached to the first side of the base plate in a first chamber of the sensor housing, said first pressure sensing die assembly including;
(1) a first pressure sensing die including a first diaphragm having an upper side configured to be in fluid communication with said first fluid and a lower side configured to be in fluid communication with said hole in said base plate and said second fluid; and
(2) at least one pressure sensitive electrical element, formed in or on the first diaphragm, configured to exhibit a varying resistance responsive to deflection of said first diaphragm representative of a differential pressure between the first pressure and the second pressure;
a second pressure sensing die assembly attached to the first side of the base plate in the first chamber of the sensor housing, said second pressure sensing die assembly including;
(1) a second pressure sensing die including a second diaphragm having an upper side configured to be in fluid communication with said first fluid and a lower side configured to be in fluid communication with said first fluid; and
(2) at least one pressure sensitive electrical element, formed in or on the second diaphragm, configured to exhibit a varying resistance responsive to deflection of said second diaphragm representative of a common mode error corresponding to the second pressure sensing die assembly;
one or more electrical conductors electrically connected to one or both of the at least one pressure sensitive electrical element of the first diaphragm and the at least one pressure sensitive electrical element of the second diaphragm.
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Accused Products
Abstract
A differential pressure sensor may provide a common mode corrected differential pressure reading. The differential pressure sensor may include two pressure sensing diaphragms. The pressure sensor may be configured so that the first diaphragm measures the differential pressure between two sections of a fluid. The pressure sensor may also be configured so that the second diaphragm measures the common mode error experienced by the die at the time the differential pressure is read by the first diaphragm. Electrical connectors may be configured so that the differential pressure outputs a common mode error corrected differential pressure reading based on the readings of the first and second diaphragm.
13 Citations
20 Claims
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1. A differential pressure sensor comprising:
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a sensor housing including a base plate having a hole therein, wherein a first side of the base plate is configured to be in fluid communication with a first fluid at a first pressure and a second side of the base plate is configured to be in fluid communication with a second fluid at a second pressure; a first pressure sensing die assembly attached to the first side of the base plate in a first chamber of the sensor housing, said first pressure sensing die assembly including;
(1) a first pressure sensing die including a first diaphragm having an upper side configured to be in fluid communication with said first fluid and a lower side configured to be in fluid communication with said hole in said base plate and said second fluid; and
(2) at least one pressure sensitive electrical element, formed in or on the first diaphragm, configured to exhibit a varying resistance responsive to deflection of said first diaphragm representative of a differential pressure between the first pressure and the second pressure;a second pressure sensing die assembly attached to the first side of the base plate in the first chamber of the sensor housing, said second pressure sensing die assembly including;
(1) a second pressure sensing die including a second diaphragm having an upper side configured to be in fluid communication with said first fluid and a lower side configured to be in fluid communication with said first fluid; and
(2) at least one pressure sensitive electrical element, formed in or on the second diaphragm, configured to exhibit a varying resistance responsive to deflection of said second diaphragm representative of a common mode error corresponding to the second pressure sensing die assembly;one or more electrical conductors electrically connected to one or both of the at least one pressure sensitive electrical element of the first diaphragm and the at least one pressure sensitive electrical element of the second diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A differential pressure sensor comprising:
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a sensor housing including a base plate having a hole therein, wherein a first side of the base plate is configured to be in fluid communication with a first fluid at a first pressure and a second side of the base plate is configured to be in fluid communication with a second fluid at a second pressure; a pressure sensing die assembly attached to said first side of said base plate, said first pressure sensing die assembly including; a support structure including a first aperture and a second aperture defined therethrough, wherein the support structure is attached to the first side of the base plate and is configured to place the first aperture in fluid communication with the hole in the base plate and the second fluid; a pressure sensing die attached to the support structure, said pressure sensing die comprising; a first chamber defining a first diaphragm having a first diaphragm upper side configured to be in fluid communication with said first fluid and a first diaphragm lower side configured to be in fluid communication with said first aperture and said second fluid; at least one pressure sensitive electrical element formed in or on the first diaphragm, the at least pressure sensitive electrical element exhibiting a varying resistance responsive to deflection of said first diaphragm representative of a differential pressure between the first pressure and the second pressure; a second chamber defining a second diaphragm including a second diaphragm upper side configured to be in fluid communication with said first fluid and a second diaphragm lower side configured to be in fluid communication with said second aperture and said first fluid; at least one pressure sensitive electrical element formed in or on the second diaphragm, the at least one pressure sensitive electrical element exhibiting a varying resistance responsive to deflection of said second diaphragm representative of a common mode error corresponding to the pressure sensing die assembly; one or more electrical conductors electrically connected to one or both of the at least one pressure sensitive electrical element bonded to the first diaphragm and the at least one pressure sensitive electrical element bonded to the second diaphragm, said one or more electrical conductors configured to output a common mode error corrected differential pressure output. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A differential pressure sensor comprising:
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a sensor housing including a base plate having a hole therein, wherein a first side of the base plate is configured to be in fluid communication with a first fluid at a first pressure and a second side of the base plate is configured to be in fluid communication with a second fluid at a second pressure; at least one pressure sensing die assembly attached to said first side of said base plate, said at least one pressure sensing die assembly including; at least one support structure including a first aperture and a second aperture defined therethrough, wherein the at least one support structure is attached to the first side of the base plate and is configured to place the first aperture in fluid communication with the hole in the base plate and the second fluid; at least one pressure sensing die attached to the at least one support structure, said at least one pressure sensing die comprising; a first chamber defining a first diaphragm having a first diaphragm upper side configured to be in fluid communication with said first fluid and a first diaphragm lower side configured to be in fluid communication with said first aperture and said second fluid; at least one pressure sensitive electrical element formed in or on the first diaphragm, the at least pressure sensitive electrical element exhibiting a varying resistance responsive to deflection of said first diaphragm representative of a differential pressure between the first pressure and the second pressure; a second chamber defining a second diaphragm including a second diaphragm upper side configured to be in fluid communication with said first fluid and a second diaphragm lower side configured to be in fluid communication with said second aperture and said first fluid; at least one pressure sensitive electrical element formed in or on the second diaphragm, the at least one pressure sensitive electrical element exhibiting a varying resistance responsive to deflection of said second diaphragm representative of a common mode error corresponding to the at least one pressure sensing die assembly; one or more electrical conductors electrically connected to one or both of the at least one pressure sensitive electrical element bonded to the first diaphragm and the at least one pressure sensitive electrical element bonded to the second diaphragm, said one or more electrical conductors configured to output a common mode error corrected differential pressure output. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification