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. 26, 1991
Filed:
Dec. 14, 1989
Rudolf Stocker, Azmoos, CH;
Balzers Aktiengesellschaft, Balzers, LI;
Abstract
In the present pressure measurement process the damping signal of a tuning fork quartz manometer, which is a measure of the prevailing pressure, is so combined with the correction value proportional to the resonant frequency that a measurement result is obtained, which is independent of any contamination of the tuning fork quartz. Apart from the resonant frequency (f.sub.R) of the measuring quartz (11), preferably also the resonant frequency (f.sub.R ') of a reference quartz (21) kept at constant pressure is determined. Thus, the damping signal (R.sub.S) can be corrected by a correction value proportional to the difference between the two reference frequencies (R.sub.R '-f.sub.R), which is substantially temperature-independent.