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Laser alignment system

  • US 4,889,425 A
  • Filed: 11/02/1987
  • Issued: 12/26/1989
  • Est. Priority Date: 11/02/1987
  • Status: Expired due to Fees
First Claim
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1. An apparatus for monitoring change in shape of a structure comprising:

  • light source means for generating a light beam, said light source means being rigidly attached to said structure;

    photodetecting means rigidly attached to said structure and positioned such that said light beam is directed onto said photodetecting means, said photodetecting means producing data representing a light intensity distribution of said light beam directed onto said photodetecting means; and

    means receiving the data for calculating values of parameters of a function modeling beam intensity distribution of the light beam, such that the calculated parameter values optimize a fit with respect to predetermined criteria of the intensity distribution modeled by the function to the intensity distribution represented by the data, wherein at least one of the parameters represents a position of said light beam on said photodetector, and for ascertaining change in shape of the structure by comparing a position of the beam defined by a calculated value of said at least one parameter to a reference position.

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