The focus acoustic field simulation based on parameter optimization of OPCM ultrasonic phased array elements

One of the fundamental features of phased arrays is the ability to focus and steer the propagating waves to a specific point and direction within the load material by inducing a certain time delay. The acoustic characteristic of phased array transducers determine whether the reflective echo can be received. Orthotropic piezoelectric composite materials (OPCM) elements which bears orthotropic function are used to design ultrasonic phased array actuator/senor. A model was developed to compute acoustic pressure distribution of the waves radiated from an ultrasonic linear phased array. Based on the model, beam directivity and focus characteristic were studied for various transducer parameters such as inter-element spacing, element width and number of elements. The focus acoustic field simulation results show that the effects of array elements parameters optimization on directivity are consistent with the one on focus acoustic field, and focus energy enhanced obviously for OPCM elements application.