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:
Apr. 26, 2005
Filed:
May. 06, 2004
Douglas C. Myhre, Eagan, MN (US);
Douglas C. Myhre, Eagan, MN (US);
Rosemount Aerospace Inc., Burnsville, MN (US);
Abstract
A non-intrusive sensor for measuring mass flow of a medium flowing through a tube comprises: a probe having a predetermined length disposed along an external wall of the tube; a heater for heating the probe at a first point along the length thereof; a first temperature measuring device disposed at the first point for measuring a temperature of the probe and for generating a first signal Trepresentative thereof; a second temperature measuring device disposed at a second point along the length of the probe for measuring another temperature of the probe and for generating a second signal Trepresentative thereof; a third temperature measuring device disposed along the external wall of the tube a distance away from the probe for measuring an ambient temperature and for generating a signal Trepresentative thereof; and circuitry coupled to the first, second and third temperature measuring devices for generating a mass flow signal based on a ratio of temperature differential signals (T−T)/(T−T). A counterpart method is also disclosed.