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Sensors 2018, 18(6), 1830; https://doi.org/10.3390/s18061830

Ultrasonic Phased Array Sparse-TFM Imaging Based on Sparse Array Optimization and New Edge-Directed Interpolation

1
College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China
2
School of Traffic and Transportation Engineering, Central South University, Changsha 410075, China
*
Author to whom correspondence should be addressed.
Received: 19 April 2018 / Revised: 24 May 2018 / Accepted: 24 May 2018 / Published: 5 June 2018
(This article belongs to the Special Issue Intelligent Sensing Technologies for Nondestructive Evaluation 2018)
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Abstract

The ultrasonic phased array total focusing method (TFM) has the advantages of full-range dynamic focusing and high imaging resolution, but the problem of long imaging time limits its practically industrial applications. To reduce the imaging calculation demand of TFM, the locations of active array elements in the sparse array are optimized by combining almost different sets with the genetic algorithm (ADSGA), and corrected based on the consistency of the effective aperture with the equivalent point diffusion function. At the same time, to further increase the imaging efficiency, a sparse-TFM image with lower resolution is obtained by reducing the number of focus points and then interpolated by the new edge-directed interpolation algorithm (NEDI) to obtain a high quality sparse-TFM image. Compared with TFM, the experimental results show that the quantitative accuracy of the proposed method is only decreased by 1.09% when the number of sparse transmitting elements reaches 8 for a 32-element transducer, and the imaging speed is improved by about 16 times with the same final pixel resolution. View Full-Text
Keywords: ultrasonic phased array; sparse-TFM imaging; sparse array optimization; new edge-directed interpolation ultrasonic phased array; sparse-TFM imaging; sparse array optimization; new edge-directed interpolation
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Hu, H.; Du, J.; Ye, C.; Li, X. Ultrasonic Phased Array Sparse-TFM Imaging Based on Sparse Array Optimization and New Edge-Directed Interpolation. Sensors 2018, 18, 1830.

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