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System for sensing shaft displacement and strain

  • US 5,734,108 A
  • Filed: 12/12/1995
  • Issued: 03/31/1998
  • Est. Priority Date: 04/10/1992
  • Status: Expired due to Fees
First Claim
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1. A system for analyzing nonrotational movement of a moving shaft having a central longitudinal axis and having a first set of grid lines spaced about its circumference formed at a first angle to the central longitudinal axis and a second set of grid lines spaced about its circumference and formed at a second angle different from the first angle, comprising:

  • first and second optical detection means mountable at fixed positions proximate to the first and second sets of grid lines respectively, for detecting the passage of lines at said first and second angles respectively and producing output signals varying with movement of the grid lines relative to optical grid images generated by the optical detection means; and

    processing circuit means connected to said first and second optical detection means for receiving said output signals and generating an output indicative of at least one of displacement of the central longitudinal axis of the shaft and displacement of the shaft along its central longitudinal axis, at a location of said first and second sets of grid lines.

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