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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Li Zhang Kazmer, D.O. Gao, R.X. Jackson, R.W. |
| Copyright Year | 2001 |
| Abstract | A wireless pressure sensor is described for use in a high-pressure manufacturing process with three major subsystems: energy conversion by a stack of piezoelectric disks, energy measurement and control by a threshold modulator, and ultrasonic signal transmission by a piezoelectric transmitter. The second system, the threshold modulator, is the focus of this paper. The charge, proportional to pressure, on a capacitive element is measured and controlled through the use of a two-transistor modulator. Standard NPN and PNP transistors are used to passively control the flow of charge between a piezoelectric stack and an ultrasonic transmitter. The basis for the design is discussed, from which a simulation is developed and compared to a bench top prototype. The results of this comparison indicate the appropriateness of the assumptions used to produce an analytical model of the design and the limiting conditions under which the modulator will effectively measure charge. Finally, the prototype device is optimized with respect to sensitivity, gain, and operating range for use in real-time process monitoring and control. |
| Sponsorship | IEEE Sensors Council |
| Starting Page | 47 |
| Ending Page | 54 |
| Page Count | 8 |
| File Size | 611947 |
| File Format | |
| ISSN | 1530437X |
| Volume Number | 6 |
| Issue Number | 1 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-02-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Wireless sensor networks Pressure control Transmitters Current measurement Charge measurement Sensor phenomena and characterization Manufacturing processes Energy conversion Energy measurement Signal processing wireless sensor Analog to digital converter charge control charge measurement injection molding passive charge modulation piezoelectric energy harvesting self powered threshold modulator wireless pressure sensor |
| Content Type | Text |
| Resource Type | Article |
| Subject | Instrumentation Electrical and Electronic Engineering |
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