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19 April 2013 Battery-less PWAS-based wireless acoustic emission sensor
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Battery-less wireless transmission of acoustic emission (AE) signal acquired using a PWAS is demonstrated in this paper. The wireless AE sensor is equipped with a passive wireless transponder that receives a microwave carrier signal and up-converts the AE signal to microwave frequencies for wireless transmission. A low voltage ultrasound amplifier was designed, fabricated, and tested to amplify the AE signal and to provide a better impedance matching between the PWAS and the 50 Ω wireless transponder. A light-based energy harvester was adopted to drive the low-power voltage amplifier so that no battery is needed at the wireless sensor node. The energy harvesting devices and the amplifier were characterized using ultrasound pitch-catch and pencil lead break experiments. The design, implementation, and characterization of the wireless AE sensing system are described.
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Md Mazharul Islam, Farshad Zahedi, and Haiying Huang "Battery-less PWAS-based wireless acoustic emission sensor", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86924C (19 April 2013);

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