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:
May. 07, 1985
Filed:
Jun. 14, 1983
David B Fenneman, Fredericksburg, VA (US);
Larry F Rinehart, Albuquerque, NM (US);
Leonard W Hardesty, Jr, King George, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
The intrinsic time constant .tau. of liquids is measured directly by using he apparatus of the present invention termed a 'taumeter'. The taumeter impresses a predetermined voltage, level between a pair of electrode immersed in the liquid to be measured. The taumeter then measures the time it takes for the foregoing voltage to decay from a predetermined value V.sub.A to a predetermined value V.sub.B. Comparator logic produces a gate pulse having a leading edge at a time T.sub.A corresponding to the occurrance of the predetermined voltage V.sub.A and a trailing edge at a time T.sub.B corresponding to the occurrance of the predetermined voltage V.sub.B. The gate pulse is used to gate a system counter which counts the zero crossings of a very accurate system clock to determine the intrinsic time constant of the liquid. The foregoing pulsing is repeated as determined by a duty cycle generator.