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:
Mar. 15, 1988
Filed:
May. 12, 1986
Gary N Burk, Columbus, OH (US);
AccuRay Corporation, Columbus, OH (US);
Abstract
Disclosed are apparatus and methods for producing electrical signals that can be used to measure the speed of ultrasound in a moving web of paper. The apparatus employs a hollow cylinder in which a plurality of transducers are positioned to contact the web. Power supplied to the cylinder through mercury slip is filtered by power conditioning circuitry in the interior of the cylinder, thus enabling the delivery of clean electrical pulses to the emitting transducers. Signals from the receiving transducers are delivered to voltage-to-frequency converter circuitry in the interior of the cylinder, and the resulting electrical frequency signals are converted to optical frequency signals. The optical signals are then communicated across an air gap to receptors which are external to the cylinder. Thus, signals from which measurements of the speed of ultrasound can be derived are provided substantially free from noise generated by transmission through slip rings.