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Method of and apparatus for inspecting honeycomb-shaped object having plural through holes

  • US 5,463,462 A
  • Filed: 03/29/1994
  • Issued: 10/31/1995
  • Est. Priority Date: 03/31/1993
  • Status: Expired due to Fees
First Claim
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1. A method of inspecting a honeycomb-shaped object having a plurality of through holes defined therein by partitions, comprising the steps of:

  • introducing a parallel light beam into the through holes at an angle with respect to an axis of the through holes;

    generating at least one Fourier-transform image from the honeycomb-shaped object by passing light through the honeycomb-shaped object; and

    determining whether there are interstices in the partitions based on the at least one Fourier-transform image, by observing whether said at least one Fourier-transform image includes a Fourier-transform image of interstices in the partitions, which includes a pattern of periodic images, said periodic images including equidistantly spaced parallel stripes.

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