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. 11, 2003
Filed:
Jan. 23, 2001
John R. Vig, Colts Neck, NJ (US);
Arthur Ballato, Oceanport, NJ (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
Methods are included for determining deviations from &phgr;=0° in test resonators based on the quasi-pure modes' displacement ratio variations with &phgr; angle. A direct relationship between deviation from &phgr;=0° and the c-mode displacement ratio has been observed, so that the larger the deviation from &phgr;=0°, then the larger is the change in the normalized frequency of the c-mode upon immersion in, or contact with, a fluid. The method includes measuring &thgr; and &phgr; angles in reference resonators with different small &phgr; angles and quasi-pure mode frequencies of reference resonators in both air and a test fluid at ambient temperatures, calculating the normalized frequency changes between the air and fluid measurements as a reference point, measuring the test resonator in air then in the fluid and comparing the results. Also includes are similar methods for measuring the &phgr; angles in the quasi-pure mode of near-BT-cut resonator plates and the LGX family of rotated-y-cut ZTC crystal resonators, so that the appropriate modes' displacement ratio variations with the &phgr; angle determine deviations from &phgr;=0°. In the preferred method of this invention the test fluid used for measuring a reference fluid quasi-pure mode frequency is pure water at ambient temperature.