METHOD AND APPARATUS FOR SHORT TERM INSPECTION OR LONG TERM STRUCTURAL HEALTH MONITORING

摘要

A method and apparatus is shown for implementing magnetostrictive sensor techniques for the nondestructive short term or long term monitoring of a structure (714). A plurality of magnetostrictive sensors (722) are arranged in parallel on the structure and includes a thin ferromagnetic strip that has residual magnetization, that is couples to the structure with a couplant, and a coil located adjacent the thin ferromagnetic strip. By a transmitting coil, guided waves (734) 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 (736) are coupled to a receiving strip and are detected by a receiving magnetostrictive coil. Reflected guided waves may represent defects in the structure.