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. 11, 2008
Filed:
Feb. 20, 2004
Mark G. Romo, Eden Prairie, MN (US);
Stanely E. Rud, Jr., Victoria, MN (US);
Charles R. Willcox, Eden Prairie, MN (US);
Robert J. Karschnia, Chaska, MN (US);
Mark G. Romo, Eden Prairie, MN (US);
Stanely E. Rud, Jr., Victoria, MN (US);
Charles R. Willcox, Eden Prairie, MN (US);
Robert J. Karschnia, Chaska, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
An electrically variable optical attenuator and associated methods are disclosed. In one aspect, the attenuator includes at least one sensor that provides a sensor output with respect to a variable that affects attenuation. Methods of characterizing the attenuator include obtaining a set of attenuation/sensed variable data, and generating a relationship (such as a look-up table or mathematical function) relating the sensed variable to the attenuation. Aspects of the invention also include characterizing the control input/attenuation output to be related by a selected mathematical function.