Journal
MICROMACHINES
Volume 12, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/mi12020099
Keywords
sensor interface; ultrasonic transducer; PVDF; voltage conveyor
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The study introduces a novel approach for receiving ultrasounds in air using a piezopolymer sensor and VCII electronic interface, achieving a sensitivity level of about -100 dB without any filtration stage. The results are obtained using a commercially available AD844 for the second-generation voltage conveyor active device with a supply voltage of +/- 15 V.
Exploiting the transmission and reception of low frequency ultrasounds in air is often associated with the innate echolocating abilities of some mammals, later emulated with sophisticated electronic systems, to obtain information about unstructured environments. Here, we present a novel approach for the reception of ultrasounds in air, which exploits a piezopolymer broadband sensor and an electronic interface based on a second-generation voltage conveyor (VCII). Taking advantage of its capability to manipulate both voltage and current signals, in this paper, we propose an extremely simple interface that presents a sensitivity level of about -100 dB, which is in line with commercially available references. The presented results are obtained without any filtration stage. The second-generation voltage conveyor active device is implemented through a commercially available AD844, with a supply voltage of +/- 15 V.
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