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A multi-resolution wireless force sensing system based upon a passive SAW device.

W Cheng1, Y Dong, G Feng

  • 1Department of Precision Instruments and Mechanology, Tsinghua University, Beijing, PR China. chengwd@post.pim.tsinghua.edu.cn

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|September 26, 2001
PubMed
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This study introduces a low-cost, multi-resolution wireless force sensing system using passive Surface Acoustic Wave (SAW) devices. The system effectively transduces electromagnetic waves into acoustic waves for wireless identification and force measurement.

Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Surface Acoustic Wave (SAW) devices are utilized in wireless identification systems.
  • Existing systems may lack multi-resolution capabilities or be high-cost.

Purpose of the Study:

  • To develop a multi-resolution wireless force sensing system.
  • To create a low-cost interrogation unit for SAW devices.

Main Methods:

  • A passive time-delay SAW device with an interdigital transducer (IDT) connected to an antenna was designed as the force sensing element.
  • Multiple reflectors were incorporated to achieve multi-resolution sensing.
  • Sample-and-hold devices replaced high-speed A/D converters to reduce system cost.

Main Results:

Related Experiment Videos

  • The system successfully transduces electromagnetic waves to surface acoustic waves and vice versa.
  • Theoretical predictions of the sensing system's properties were validated through experimental verification.
  • The use of sample/hold devices contributed to a low-cost interrogation system.

Conclusions:

  • The developed system offers a viable solution for multi-resolution wireless force sensing.
  • The integration of SAW technology with specific design elements enables cost-effective wireless sensing applications.