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:
Dec. 26, 1995
Filed:
Aug. 12, 1994
Jay N Zemel, Jenkintown, PA (US);
Hsin-Yi Hsieh, Drexel Hill, PA (US);
Anita L Spetz, Linkoping, SE;
Gas Research Institute, Chicago, IL (US);
Abstract
A pyroelectric swirl indicator for measurement of swirl in flowing fluid comprising at least one pyroelectric substrate having at least one surface to which is applied a fluctuating heat input, the fluctuating heat input causing a fluctuating surface charge distribution in response to temperature fluctuations of the substrate. Spaced apart conductor elements for sensing the fluctuating surface charge on the surface of the substrate in the vicinity of the spaced apart conductor elements are provided, the differences in the charge fluctuations between the spaced apart conductor elements comprising an indication of swirl flow in the fluid, said spaced apart conductor elements disposed in a manner which enables measurement of orthogonal components of fluid flow.