G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/04 (2006.01) G01N 3/30 (2006.01) G01N 3/02 (2006.01) G01N 3/04 (2006.01) G01N 3/06 (2006.01)
Patent
CA 2077214
The apparatus of the invention comprises a portable, hand- held unit having a plurality of impactors disposed therein. The plu- rality of impactors comprise a number of differently weighted spheres that are each designed to impart a different impact energy into the structure to be tested. Each sphere is disposed on a distal end of a spring-steel rod. A particular weighted sphere is chosen by a selector disposed on the testing unit. The sphere is withdrawn from the rest position by a pair of jaws to a given height above the structure. At a predetermined released point, the sphere is released, causing it to impact the structure with a specific duration and im- part a given energy thereto. The impact produces stress waves that are reflected from the internal flaws and external surfaces of the structure. The reflected waves are detected by a transducer that con- verts the stress waves into an electrical signal (displacement wave- form). The waveform is then processed to provide an amplitude spectrum, and in the case of plates, a reflection spectrum. For plates, the reflection spectrum can be interpreted by a neural ne- twork which provides results that are indicative of either the thick- ness of the structure or of the defects disposed therein.
Pratt Donald G.
Sansalone Mary J.
Cornell Research Foundation Inc.
Kirby Eades Gale Baker
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