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:
Jan. 10, 2006
Filed:
Feb. 24, 2004
David R. Sosnowski, Lake Orion, MI (US);
Gordon M. Fincannon, West Bloomfield, MI (US);
David R. Sosnowski, Lake Orion, MI (US);
Gordon M. Fincannon, West Bloomfield, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A database is compiled of values of the frequency fcorresponding to the minimum reactance Z″(Nyquist minimum) versus temperature Tover a selected range of temperatures for a probe immersed in a sample of the fluid to be monitored and excited by an a.c. voltage and the frequency swept over a range to cover both bulk fluid and electrode interface impedance characteristics. The probe is then excited in situ and the temperature measured. The Nyquist minimum is then determined from the database and the current measured on the low frequency (interfacial) side of the Nyquist minimum. The angle Θ of the rate of change of resistance Z″ with respect to resistance Z' and magnitude of the impedance Zis then determined from the current measurement; and, the fluid condition Ψ determined from a previously compiled database of values of Ψ, Zand Θ.