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Reader Architectures for Wireless Surface Acoustic Wave Sensors.

Fabian Lurz1, Thomas Ostertag2, Benedict Scheiner3

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Summary

Wireless surface acoustic wave (SAW) sensors offer passive, wireless operation ideal for industrial metrology in harsh environments. This review surveys reader architectures and performance metrics for SAW sensors.

Keywords:
frequency measurementpressure sensorsurface acoustic wavestemperature sensortorque sensortransceiver architecturewireless sensor

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Wireless Surface Acoustic Wave (SAW) sensors are valuable for industrial metrology due to their passive operation and wireless readout.
  • Their small size, low cost, and ruggedness make them suitable for inaccessible and harsh environments.
  • SAW sensors require dedicated excitation and interrogation circuits, known as readers, to perform measurements.

Purpose of the Study:

  • To provide a comprehensive survey of current reader architectures for wireless SAW sensors.
  • To compare and discuss critical performance parameters of state-of-the-art SAW sensor interrogation systems.
  • To highlight the potential of SAW sensors in industrial metrology applications.

Main Methods:

  • Review of existing literature on SAW sensor reader architectures.
  • Analysis of Time Domain Sampling (TDS), Frequency Domain Sampling (FDS), and hybrid concepts.
  • Comparison of performance metrics including measurement accuracy, dynamic range, update rate, and hardware costs.

Main Results:

  • Various reader architectures for SAW resonators and reflective SAW delay line sensors have been investigated.
  • Key performance parameters of different interrogation techniques are presented and discussed.
  • The review offers insights into the current state of technology in SAW sensor readers for industrial use.

Conclusions:

  • Wireless SAW sensors are highly promising for industrial metrology, especially in challenging conditions.
  • The choice of reader architecture significantly impacts sensor performance and application suitability.
  • Further development and comparison of reader designs are crucial for optimizing SAW sensor systems.