Ultrosonic Beam Steering Behavior of Linear Phased Arrays in Solid

Abstract

This paper studies the beam steering behavior of linear phased arrays in solid and analyzes the influence of the SV waves on the beam steering performance of P waves. The analytical formulas of the beam steering field of P waves in the far field in solid are derived. The influence of array design parameters on the beam steering performance of P waves is discussed in detail by numerical simulation. The results show that the grating lobes of SV waves can be eliminated by selecting the inter-element spacing less than a critical value, and the main lobes of that can be eliminated when P waves are steered at a high steering angle larger than a critical value. The analytical expression of the critical inter-element spacing and steering angle are also obtained. In addition, a larger element size can provide a higher energy of P waves relative to SV waves.