This work demonstrates the fabrication of high-frequency ultrasound transducers, which are capable of sensing high-frequency and broad bandwidth photoacoustics and ultrasound signals. For sensor film fabrication purposes, a piezoelectric composite polymer consisting of PVDF-TrFE (Polyvinylidene difluoride trifluoroethylene) and lab-synthesized single crystal BSTO (Barium Strontium Titanate) nanofiller is used. The piezoelectric efficiency after the addition of BSTO in PVDF-TrFE is characterized using FTIR spectroscopy. The fabricated transducers are tested in the pulse-echo mode and the central frequency is found up to 43 MHz with a bandwidth of 40 MHz (93% at -6dB). Photoacoustic signals of frequency 14.5MHz and bandwidth of more than 100% are detected using the fabricated transducers. The transducers are used for photoacoustic imaging of two photoacoustic sources. The high sensitivity and broad frequency spectrum of the transducers make them suitable for high-resolution photoacoustics and ultrasound imaging for biomedical imaging and nondestructive testing.
In this work, we have developed PVDF-TrFE/BaTiO3 composite thin film-based highly sensitive ultrasound (US) and photoacoustic (PA) transducer. The synthesized nanocomposite polymer-based sensor film has been grown layer by layer on the flat surface of a 9.00 mm diameter aluminum substrate. The fabricated transducer has been tested in pulse-eco mode and it shows high sensitivity with a peak-to-peak voltage 800 mV. Preliminary US and PA experiments have been performed with the aluminum block and multi-layer ink coated phantom. The central frequency of the obtained acoustic signal was found to be 44 MHz with an acoustic bandwidth of 32 MHz (72% of central frequency at -6 dB). The PA signals have been detected with the fabricated transducer and the estimated frequency spectrum shows multiple sub-band central frequencies varying from 17 MHz to 55 MHz. Due to its high sensitivity and broad bandwidth, the developed transducer can be used for high-resolution US and PA microscope imaging (PAI).
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