Immersion ultrasonic array imaging using a new array spatial signature in different imaging algorithms

In this paper, we consider the problem of immersion ultrasonic test when a uniform array of ultrasonic transducer is utilized. Since the sound wave propagates in water and solid with two different velocities, the imaging techniques for homogeneous materials can not be utilized. In this paper, we have used a new array spatial signature, which is derived based on distributed source modeling, in three imaging algorithms including the conventional beamforming technique, the MUSIC method, and the Capon algorithm. To show the accuracy of the proposed array spatial signature, we conducted an ultrasonic immersion test. Experimental results of the three aforementioned imaging algorithms, presented here, show the accuracy of the proposed array spatial signature.