21 June 1999 Improved diffracting-grating transducers
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Abstract
Diffracting grating transducers are interdigitated grating- like structures of thin elements spaced at a few wavelengths apart. By changing the phase or the frequency of the driving signal, two beams whose angle differs by a known quantity are produced. Doppler measurements in the blood stream at the two beam angles enable the estimation of angle- independent blood velocity. The performance of diffracting grating transducer in term of efficiency and bandwidth has been optimized by finite element analysis. Two different arrays operating at 5 MHz and 10 MHz were fabricated and modeled. The simulated and measured insertion losses for each transducer were compared. To broaden the bandwidth, matching layers were included in the design. The insertion losses for different driving modes were also computed. The results may shed light as to how the performance of the diffracting grating transducer may be improved to make better angle independent Doppler velocity measurements.
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Peggy Palanchon, David H. R. Vilkomerson, Thomas Chilipka, K. Kirk Shung, "Improved diffracting-grating transducers", Proc. SPIE 3664, Medical Imaging 1999: Ultrasonic Transducer Engineering, (21 June 1999); doi: 10.1117/12.350671; https://doi.org/10.1117/12.350671
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