TV fatigue crack monitoring system
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorReginald J. Exton
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Abstract
An apparatus is disclosed for monitoring the development and growth of fatigue cracks in a test specimen subjected to a pulsating tensile load. A plurality of television cameras photograph a test specimen which is illuminated at the point of maximum tensile stress. The television cameras have a modified vidicon tube which has an increased persistence time thereby eliminating flicker in the displayed images.
Claims7
A fatigue crack monitoring apparatus comprising a specimen which is subjected to a pulsating tensile load which varies from a maximum to a minimum;
- a strobe light means for illuminating said specimen;
- a video means for taking television pictures of said specimen;
- a display means for displaying said television pictures;
- and a recording means for recording said television pictures.
Dependencies are inferred from the claim text.