Measuring and testing – Vibration – Sensing apparatus
Patent
1995-12-12
1998-03-31
Williams, Hezron E.
Measuring and testing
Vibration
Sensing apparatus
73660, G01H 1700, G01M 1300
Patent
active
057341087
ABSTRACT:
A system detects relative movement between an optical sensor unit and a set of finely spaced, parallel grid lines. Unlike prior optical line detection systems, each set of lines is applied to a surface of an object at an angle relative to movement between the optical sensor unit and the object. The system is particularly useful for monitoring rotating members, such as shafts, but is also useful with linearly moving members. In a preferred shaft monitoring application, a plurality of optical units are provided, with a plurality of corresponding sets of parallel lines at different angles on the shaft. Signal output phase differences between the optical units are compared to precisely determine movement of the shaft in seven directions of freedom, including rigid body displacement components along three translational and three rotational axes, and shaft twist. The differentially angled sets of lines may be spaced axially along the shaft or other object, or a plurality of angled line sets may be superimposed in a single location as a set of cross-hatched lines.
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Walker Dana A.
Walker Michael D.
Miller Rose M.
Sixbey Daniel W.
Smith Evan R.
Williams Hezron E.
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