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Wireless Passive Sensor Technology through Electrically Conductive Media over an Acoustic Channel.

Thomas Schaechtle1, Taimur Aftab1, Leonhard M Reindl1

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Summary
This summary is machine-generated.

This study introduces a novel passive wireless sensor for monitoring hydrogen tanks. The technology uses ultrasonic waves for temperature sensing within carbon-fiber-reinforced polymer tanks, ensuring safe operation.

Keywords:
acoustic communication channelchipless sensorharsh environmentpassive sensor technologyresonant sensorwireless readout

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Area of Science:

  • Materials Science and Engineering
  • Sensor Technology
  • Mechanical Engineering

Background:

  • Hydrogen storage in carbon-fiber-reinforced polymer (CFRP) tanks is crucial for climate-friendly mobility.
  • Internal monitoring of these high-pressure tanks is essential for safety and long-term operation.
  • Existing wired and wireless technologies are unsuitable for internal tank monitoring due to the harsh environment.

Purpose of the Study:

  • To present a novel passive wireless sensor technology for internal monitoring of CFRP hydrogen tanks.
  • To demonstrate acoustic communication through the tank hull using ultrasonic waves.
  • To enable wireless temperature measurement within the operational range of hydrogen tanks.

Main Methods:

  • Development of a passive wireless sensor node utilizing an analog resonant sensor with a high quality factor.
  • Implementation of an ultrasonic communication channel through the electrically conductive CFRP tank hull.
  • Characterization of electric impedances and acoustic transmission for designing the measurement setup.

Main Results:

  • Successful wireless temperature measurement through a 10 mm CFRP plate.
  • Demonstrated operation across the full temperature range of -40 to 110 °C.
  • Achieved a high-resolution temperature measurement with less than 1 mK accuracy.

Conclusions:

  • The developed passive wireless sensor technology is effective for monitoring CFRP hydrogen tanks.
  • Ultrasonic acoustic communication provides a viable method for internal tank sensing.
  • This technology enhances the safety and reliability of hydrogen-based mobility solutions.