Study on Electrical Impedance Matching for Broadband Ultrasonic Transducer

Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers

High-quality broadband ultrasound transducers yield superior imaging performance in biomedical ultrasonography. However, proper design to perfectly bridge the energy between the active piezoelectric material and the target medium over the operating spectrum is still lacking. Here, we demonstrate a new anisotropic cone-structured acoustic metamaterial matching layer that acts as an inhomogeneous...

A New Method of Designing Electrical Impedance Matching Network for Piezoelectric Ultrasound Transducer

A new method that is based on genetic algorithm (GA) is developed to design electrical impedance matching network for broadband piezoelectric ultrasound transducer. The new method can both optimize the topology of the matching network and perform optimization on the components at the same time. Results of classical algorithms are referenced to reduce the number of candidate topologies and great...

The Effect of Electrical Impedance Matching on the Electromechanical Characteristics of Sandwiched Piezoelectric Ultrasonic Transducers

For achieving the power maximum transmission, the electrical impedance matching (EIM) for piezoelectric ultrasonic transducers is highly required. In this paper, the effect of EIM networks on the electromechanical characteristics of sandwiched piezoelectric ultrasonic transducers is investigated in time and frequency domains, based on the PSpice model of single sandwiched piezoelectric ultrason...

Broadband Identification of Battery Electrical Impedance for Hev

Electrical impedance measurements provide useful information about the characteristics of a Li-ion battery. The classical method of measurement consists in performing an impedance spectroscopy relying on offline records of the response of the battery to a controlled current or voltage test signal. This method is robust but presents an important drawback: it is very time consuming, especially fo...

Interfacial structure designs with impedance-matching for ideal broadband antireflections