Patent Number: 6,396,262

Title: Method and apparatus for short term inspection or long term structural health monitoring

Abstract: A method and apparatus is shown for implementing magnetostrictive sensor techniques for the nondestructive short term inspection or long term monitoring of a structure. A plurality of magnetostrictive sensors are arranged in parallel on the structure and includes (a) a thin ferromagnetic strip that has residual magnetization, (b) that is coupled to the structure with a couplant, and (c) a coil located adjacent the thin ferromagnetic strip. By a transmitting coil, guided waves are generated in a transmitting strip and coupled to the structure and propagate along the length of the structure. For detection, the reflected guided waves in the structure are coupled to a receiving strip and are detected by a receiving magnetostrictive coil. Reflected guided waves may represent defects in the structure.

Inventors: Light; Glenn M. (San Antonio, TX), Kwun; Hegeon (San Antonio, TX), Kim; Sang-Young (San Antonio, TX), Spinks, Jr.; Robert L. (San Antonio, TX)

Assignee: Southwest Research Institute

International Classification: G01N 29/11 (20060101); G01N 29/24 (20060101); G01N 29/04 (20060101); G01N 027/82 (); G01N 029/04 (); G01N 009/24 (); G01R 033/12 ()

Expiration Date: 05/28/2019