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:
Feb. 14, 1995
Filed:
Mar. 24, 1993
Philip M Anderson, Madison, NJ (US);
Other;
Abstract
Torque in a rotating or stationary shaft is measured by apparatus that includes: a light source for emitting light along a light path; a light detector for receiving the light; a first polarizing filter comprising a single polarizing area and having a first axis-of-polarization attached at a first point along the shaft within the light path and between the light source and the light detector; and a second polarizing filter comprising a single polarizing area and having a second axis-of-polarization, attached at a second point along the shaft and within the light path and between the light source and the light detector. Twist in the shaft produces a change in angle between the first and the second axis-of-polarization, which change in angle produces a change in intensity of the light.