Frequency-domain imaging algorithm for ultrasonic testing by application of matrix phased arrays

Dmitry Dolmatov,Yana Salchak,Roman Pinchuk,V. Borikov,S. Uchaikin,A. Dolgih,P. Baranov,A. Ignatovskaya,V. Ivanova

doi:10.1051/matecconf/201710201015

Dmitry Dolmatov, Yana Salchak + Show 7 more

Open Access

https://doi.org/10.1051/matecconf/201710201015

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Abstract

Constantly increasing demand for high-performance materials and systems in aerospace industry requires advanced methods of nondestructive testing. One of the most promising methods is ultrasonic imaging by using matrix phased arrays. This technique allows to create three-dimensional ultrasonic imaging with high lateral resolution. Further progress in matrix phased array ultrasonic testing is determined by the development of fast imaging algorithms. In this article imaging algorithm based on frequency domain calculations is proposed. This approach is computationally efficient in comparison with time domain algorithms. Performance of the proposed algorithm was tested via computer simulations for planar specimen with flat bottom holes.

Highlights

Methods of nondestructive testing are used extensively in aerospace industry due to high requirements for materials and systems quality
One of the most promising methods is ultrasonic imaging by using matrix phased arrays. This technique allows to create three-dimensional ultrasonic imaging with high lateral resolution
Thereby, frequency domain algorithm based on Stolt mapping should be extended for application of full matrix capture technique in order to build three-dimensional reconstruction

Summary

Introduction

Methods of nondestructive testing are used extensively in aerospace industry due to high requirements for materials and systems quality. Ultrasonic phased array probes are most common for industrial applications. The main advantage of matrix phased array transducers is that it can be used for 3-D reconstruction. Application of linear arrays is limited for this purpose [2]. Further progress in ultrasonic imaging is determined by development of fast imaging algorithms within the application of matrix phased arrays. There are two basic types of imaging algorithms: frequency-domain and time-domain. It is known that frequency-domain algorithms have better computational speed in comparison with time-domain type [3]. By that reason it is challenging to develop a new three-dimensional imaging algorithm based on calculations in frequency domain. Thereby, frequency domain algorithm based on Stolt mapping should be extended for application of full matrix capture technique in order to build three-dimensional reconstruction

Materials and methods

Results and discussion

Conclusions