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Passive Wireless LC Proximity Sensor Based on LTCC Technology.

Mingsheng Ma1, Yi Wang2, Feng Liu3

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Sensors (Basel, Switzerland)
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PubMed
Summary
This summary is machine-generated.

This study introduces a passive wireless eddy current proximity sensor utilizing inductive-capacitive (LC) resonance. The sensor demonstrates high sensitivity and a wide detection range for metal targets, suitable for harsh environments.

Keywords:
LC resonanceLTCC technologyeddy currentproximity sensor

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Area of Science:

  • Sensor Technology
  • Electromagnetics
  • Materials Science

Background:

  • Passive wireless sensors are crucial for remote monitoring in challenging conditions.
  • Inductive-capacitive (LC) resonance offers a promising mechanism for proximity sensing.
  • Low Temperature Co-Fired Ceramic (LTCC) technology enables robust sensor fabrication.

Purpose of the Study:

  • To develop and characterize a passive wireless eddy current proximity sensor.
  • To investigate the sensor's performance with different metal targets (copper, aluminum).
  • To analyze the impact of target geometry on sensor sensitivity.

Main Methods:

  • Utilized Low Temperature Co-Fired Ceramic (LTCC) for sensor fabrication.
  • Employed electromagnetic simulation and circuit modeling to understand operational principles.
  • Conducted experimental measurements using copper and aluminum targets of varying dimensions.

Main Results:

  • Observed decreased sensitivity with reduced target surface area and thickness.
  • Achieved a high sensitivity of 11.2 MHz/mm for proximity distances of 1-3 mm.
  • Demonstrated a substantial detection range of up to 10 mm.

Conclusions:

  • The developed LC resonance sensor is effective for passive wireless metal detection.
  • Sensor performance is influenced by target material properties and dimensions.
  • The technology is well-suited for proximity measurements in harsh environments.