Noise filtering in the synthetic transmit aperture imaging by decomposition of the time reversal operator: Application to flaw detection in coarse-grained stainless steels
Abstract
In the present work, the Synthetic Transmit Aperture (STA) imaging is applied on coarse grained steels using a contact phased-array probe. In order to reduce the noise introduced by the heterogeneous structure, as well as artifacts due to surface guided waves, the Decomposition of the Time Reversal Operator method is performed before calculating STA images.
Keywords
Decomposition of the time reversal operator
Flaw detection
Heterogeneous materials
Heterogeneous structures
Noise filtering
Non destructive testing
Phased array probes
Synthetic transmit aperture imaging
Ultrasonic testing
Antenna phased arrays
Audio signal processing
Guided electromagnetic wave propagation
Materials testing
Nondestructive examination
Spurious signal noise
Synthetic apertures
Ultrasonic applications
Ultrasonic imaging