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Fluorescent penetrant measurement borescope

  • US 5,202,758 A
  • Filed: 09/16/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 09/16/1991
  • Status: Expired due to Fees
First Claim
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1. A fluorescent type borescope having an elongated insertion tube that has a proximal end, a distal end, a distally disposed optical pickup for viewing remotely located targets, and target measuring means including:

  • a first light source that emits light causing an illuminated indication to fluoresce;

    a second light source that emits visible light;

    auxiliary image creating means operatively associated with said second light source, and being disposed to cause an image created to change at least one characteristic in proportion to the distance between an indication to be measured and the distal end of said insertion tube;

    measuring means for determining the change in characteristic of said created image, so that the true physical size of the indication to be measured can be determined;

    a first fiber optic bundle extending from said proximal end to said distal end of said insertion tube and being connected to said first light source; and

    a second fiber optic bundle extending from the proximal end to the distal end of said insertion tube, having an optical axis, and being connected to said second light source, said first and second fiber optic bundles terminating in spaced apart relationship at the distal end of the insertion tube, whereby a target that may include an indication can be viewed.

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