A solid state threshold energy switching device based on a relaxation oscillator is discussed in the context of a self energizing wireless pressure sensor. The study is an integral part of the design of a wireless pressure sensor for in-situ injection molding machine cavity pressure measurement and real time process control. The pressure information is measured using a piezoelectric stack and converted to a train of ultrasonic pulses, using the oscillator based threshold switching device, to a receiver outside of the mold. In this paper the threshold switching device is developed, simulated using a circuit simulation program, and validated experimentally. Its properties are discussed with reference to pressure measurement and acoustic signal transmission.
Threshold Energy Switching and Its Application to Wireless Sensing in High Energy Manufacturing Processes
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Theurer, CB, Zhang, L, Kazmer, DO, & Gao, RX. "Threshold Energy Switching and Its Application to Wireless Sensing in High Energy Manufacturing Processes." Proceedings of the ASME 2002 International Mechanical Engineering Congress and Exposition. Dynamic Systems and Control. New Orleans, Louisiana, USA. November 17–22, 2002. pp. 1071-1077. ASME. https://doi.org/10.1115/IMECE2002-33219
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