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- W1973002570 abstract "Ferroelectrets can be significantly improved in their piezoelectric activity by DC-biasing of the properly expanded cellular films. Experiments with polypropylene films have resulted in piezoelectric d <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>33</sub> -coefficients of up to 750 pC/N in the near-ultrasonic range. Stacks of up to 3 layers of ferroelectrets exhibit d <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>33</sub> -values in excess of 2000 pC/N. Ultrasonic senders built with such ferroelectrets generate high sound pressures, the levels depending on transducer size, applied AC-voltage, and distance from source. Unbiased receivers consisting of stacks of 4 or 5 films exhibit sensitivities of about 10 mV/Pa in the near ultrasonic range." @default.
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- W1973002570 date "2009-09-01" @default.
- W1973002570 modified "2023-10-02" @default.
- W1973002570 title "Broadband ferroelectret transducers" @default.
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- W1973002570 doi "https://doi.org/10.1109/ultsym.2009.5441589" @default.
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