The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
Aug. 07, 2002
Anthony D. Kurtz, Ridgewood, NJ (US);
Joseph Van De Weert, Cliffside Park, NJ (US);
Kulite Semiconductor Products, Inc., Leonia, NJ (US);
Abstract
A differential and absolute transducer are secured to a Pyrex glass header by means of a glass metal frit or other suitable interface. One of the sensors measures absolute pressure and the sensor is a sealed cavity, while the other sensor is designed to measure differential pressure and the sensor is an aperture which permits the pressure media to reach both sides of the sensor. The header itself has a through hole connected to a tube over which the differential sensor is affixed. The Pyrex glass is chosen to match the coefficient expansion of the sensors. The header in turn is attached to an adapter that enables static pressure to be applied to both sensors simultaneously and total pressure applied to the differential sensor, thus permitting the measurement of the difference between the total pressure and the static pressure. Each of the sensors is fabricated by the same processing techniques and is of the same thickness, but have different deflecting areas such that the differential sensor will have a greater stress through the same pressure. By obtaining both the differential and the static pressure, one can now determine air speed by the solution of Bernoulli's theorem for a total pressure in a compressible flow, such as through air or any other fluid.