Special linear phased array probes used for ultrasonic examination of complex turbine components

摘要

A large variety of linear phased array probes (LPAP) [size, frequency,bandwidth, multi-heads, pitch size] were designed and manufactured forexamination of complex-shape turbine components, such as blade roots, rotorsteeples, narrow-gap welds, disk blade rim attachment. The probes weredesigned and characterised for the following features: geometric dimensions,centre frequency, pulse duration, beam features (focal depth, beam spread inboth directions, signal-to-noise ratio). Multi-head LPAP were manufacturedto optimise detection and sizing for limited accesses contact areas.Examples of probe characterisation, detection and sizing of artificial andnatural defects are given for the following applications: blade roots, rotorsteeple, and disk rims. Examples of probe beam features are also presented.Some aspects of Imasonic and OPG QA program for phased array probecharacterisation will be illustrated