BROADBAND HIGH-SENSITIVITY AE SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a broadband AE (acoustic emission) sensor having detection performance substantially equal to or higher than that of an AE sensor using lead-based piezoelectric ceramic typified by PZT.SOLUTION: In a broadband AE sensor detecting an AE wave using a piezoelectric element, lead-free piezoelectric ceramic having a density of 4.0-6.5 g/cmis used as a piezoelectric material of a piezoelectric element. The broadband AE sensor incorporates a preamplifier amplifying an output from a piezoelectric element. The broadband AE sensor includes a case with a watertight seal. In the broadband AE sensor, a lead-free piezoelectric ceramic contains a piezoelectric solid solution composition represented by general formula: {M(NaLiK)}{(TiZrHf)(NbTa)}O.SELECTED DRAWING: Figure 4