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:
Nov. 28, 1989
Filed:
Feb. 18, 1988
Charles B Leffert, Troy, MI (US);
Leo H Weisman, Warren, MI (US);
Other;
Abstract
A mass flow meter particularly adapted for measuring the mass flow rate of finely divided coal being transmitted through a conduit, for example, as used in large scale fossil fuel power plants. The invention is particularly related to several embodiments of transducer assemblies mounted to the conduit which enable ultrasound pulses to be transmitted across the conduit and detected such that the downstream drift and attentuation of the pulses can be evaluated and correlated to coal concentration and velocity. In a first embodiment, a pair of transducers on variable pitch mounts are located at diametrically opposite positions across the conduit. The transmitting transducer is aimed upstream with respect to the flow and simultaneously the receiving transducer is aimed downstream a corresponding angular amount such that it receives the transmitted pulse in a manner which produces a maximum amplitude output signal. In a second embodiment, a pair of transducer linear arrays are positioned diametrically across the diameter of the conduit. Discrete elements along the linear array are pulsed with a time delay to provide a steerable wave front which traverses the conduit. The received signal is time delayed to reconstruct the angular wave front.