Problems of extracting ultrasonic signals from structural noise during inspection of articles produced from materials with complex structures

Abstract

Problems of ultrasonic testing of materials with complex structures are considered. Such problems arise owing to a correlated interference—structural noise (SN). The simplest models describing the formation of SN are analyzed, and static noise characteristics are determined for them. The main concepts that define the parameters of SN are introduced. The requirements imposed on the procedure of discriminating echo signals from a flaw against a correlated-noise background are determined.