The influence of element arrangements on the sound field of linear phased array ultrasound transducers

Ultrasonic measurement has been used for ocean engineering, noninvasive medical application, and nondestructive testing for years. Ultrasound transducer plays a significant role in whole system. Ultrasonic transducer is piezoelectric transducer, it takes a wide range of relevant knowledge to fully describe it when conducting analyzes; therefore, there are many areas of domestic and foreign scholars, integrating a wide range of simulation methods, simulation software, or a combination of different algorithms to establish model that can represent the real system in order to reduce the costs of trial and error. In addition to the simulation, the actual manufacture and selection of acoustic material also deeply affect the merits of the finished design. However, the energy emitted from single ultrasound transducer is too small, so the array type of the ultrasound transducers is considered no matter in medical or engineering, hope that sound beam can achieve the best constructive interference in order to achieve the purpose of energy which is more concentrated. The research discuss different parameters which have impact on the sound field of linear phased array through simulation, the parameters including：element spacing, element width, element length, element numbers. The research fabricate ultrasound transducers to form a linear array, using a pairs of transducers to measure the directivity of it and figure out the directivity tendency of linear phased array. The results between experiment and simulation are compared to prove the feasibility of the study. Besides, the design of the linear phased array transducers is explored in this research. Hope to provide some reference for future work.