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Threshold Energy Switching and Its Application to Wireless Sensing in High Energy Manufacturing Processes

[+] Author Affiliations
Charles B. Theurer, Li Zhang, Robert X. Gao

University of Massachusetts at Amherst, Amherst, MA

David O. Kazmer

University of Massachusetts at Lowell, Lowell, MA

Paper No. IMECE2002-33219, pp. 1071-1077; 7 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-3629-0 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


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.

Copyright © 2002 by ASME



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