Improved Ultrasonic CT Imaging Algorithm of Concrete Structures Based on Simulated Annealing

Abstract

In ultrasonic testing of concrete structure quality, in order to obtain an accurate evaluation to concrete quality, the high imaging accuracy is needed. Because of the non-uniformity of concrete structure, classic algorithm is difficult to meet the requirement of high accuracy tomography computation, and even disabled result will be obtained. An improved simulated annealing (SA) algorithm based on chaos search and natural weight function is presented. Firstly, curve ray tracing method is applied to determine the final propagation path, and then chaos search and natural weight function are introduced to modify the path and improve the accuracy of simulated annealing-backfire algorithm, and the CT image of structure is calculated and obtained by the algorithm. It is shown from numerical simulation that the improved algorithm is more effective and accurate, and imaging resolution is improved obviously.

Keywords

• Concrete structures
• Ultrasonic CT
• Curve ray tracing
• Simulated annealing.