Sensors, Volume 21, Issue 13 (July-1 2021) – 370 articles
Cover Story (view full-size image):
With the scaling down of acoustic particle velocity sensors and the sensitivity enhancement package, acoustic horns are becoming smaller and smaller. For millimeter-sized acoustic horns, the influence of the velocity boundary layer effect is no longer neglectable, and the conventional horn model is gradually becoming less accurate. Chang et al. describe the design and optimization of small-sized acoustic horns designed for the MEMS-based thermal acoustic particle velocity sensor. The boundary layer effect was taken into consideration. A three-wire thermal acoustic particle velocity sensor was fabricated and packaged in the optimized double cone tube horn. Experiment results show that an amplification factor of 6.63 at 600 Hz and 6.93 at 1 kHz was achieved. View this paper.
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