Bioinspired Transducer and Second-Generation Voltage Conveyor for a SONAR System

Ultrasonic transducers for in-air applications are mostly characterized by a narrow frequency band, representing a technological bottleneck for bioinspired SONAR systems. To overcome actual limitations, efforts have been focused on both transducers and electronic interfaces using alternative technological solutions. The use of polyvinylidene fluoride (PVDF) has been proposed for the fabrication of an asymmetricshaped ultrasonic transducer, inspired by the cochlea of mammals. Moreover, the generation and reception of ultrasounds exploited the use of second-generation voltage conveyors (VCII). Obtained results evidenced that the transducer possess interesting characteristics in terms of bandwidth (similar to 80 kHz) and directionality (360 degrees on both planes), while the electronic interfaces are characterized by a nonconstant gain bandwidth product, so providing a wide bandwidth (100 kHz) also at higher gain level (90 dB in reception).

Automated summary

Ultrasonic transducers for in-air applications are limited by their narrow frequency band, but efforts have been made to overcome this limitation. The use of PVDF and VCII technology has been proposed to improve the transducers and electronic interfaces. Experimental results have shown that the transducers have interesting characteristics in terms of bandwidth and directionality, while the electronic interfaces provide a wide bandwidth even at higher gain levels.