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:
Sep. 18, 2012
Filed:
Dec. 09, 2009
Sherk Chung, Piedmont, CA (US);
James Macallen Chalmers, Danville, CA (US);
Jialing Chen, San Jose, CA (US);
Yi Wang, Foster City, CA (US);
Paul Tran, Sacramento, CA (US);
Sophia Leonidovna Shtilman, Sunnyvale, CA (US);
Joseph R. Monkowski, Danville, CA (US);
Sherk Chung, Piedmont, CA (US);
James MacAllen Chalmers, Danville, CA (US);
Jialing Chen, San Jose, CA (US);
Yi Wang, Foster City, CA (US);
Paul Tran, Sacramento, CA (US);
Sophia Leonidovna Shtilman, Sunnyvale, CA (US);
Joseph R. Monkowski, Danville, CA (US);
Pivotal Systems Corporation, Pleasanton, CA (US);
Abstract
An in-situ gas flow measurement controller measures the temperature and rate of pressure drop upstream from a flow control device (FCD). The controller samples the pressure and temperature data and applies the equivalent of a decimating filter to the data to produce filtered data at a slower sampling rate. The controller derives timestamps by counting ticks from the sampling clock of the A/D converter that is sampling the pressure at regular intervals to ensure the timestamps associated with the pressure samples are accurate and do not contain jitter that is associated with software clocks. The controller additionally normalizes the temperature reading to account for power supply fluctuations, filters out noise from the pressure and temperature readings, and excludes data during periods of instability. It calculates the gas flow rate accounting for possible non-linearities in the pressure measurements, and provides the computed gas flow measurement via one of many possible interfaces.