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Related Concept Videos

Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

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The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
560

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Updated: Mar 29, 2026

Manufacturing Simple and Inexpensive Soil Surface Temperature and Gravimetric Water Content Sensors
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Enhanced Fringing Field Micro-Moisture Sensor with Elements Optimization.

Xiangrui Meng1, Chong Li1, Yunlong Lan2

  • 1Department of Automation and Measurement, Ocean University of China, Qingdao 266100, China.

Micromachines
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed economic, miniaturized micro-moisture sensors using an interdigitated fringe electric field principle. Optimized prototypes offer high sensitivity and consistency, paving the way for industrial applications.

Keywords:
fringing electric field sensormoisture detectionsensor optimization

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Traditional moisture sensors often lack miniaturization, cost-effectiveness, and high resolution.
  • Printed Circuit Board (PCB) based sensors offer a potential platform for miniaturized sensor development.
  • Interdigitated fringe electric field (IFE) sensing is a promising technique for moisture detection.

Purpose of the Study:

  • To establish a principle and optimization methodology for economic, miniaturized, high-resolution micro-moisture sensors.
  • To investigate the IFE principle for PCB-based moisture sensors and optimize key design parameters.
  • To develop design rules for enhanced measurement sensitivity and batch consistency.

Main Methods:

  • Investigated the IFE principle for PCB-based sensor design.
  • Conducted comprehensive analysis of parameter variations to establish design rules.
  • Designed and manufactured two sensor prototypes.
  • Utilized water droplets to control ambient relative humidity (%RH).
  • Employed a double-correlated sampling circuit for capacitance sensing.

Main Results:

  • Achieved high-resolution micro-moisture sensors with linearity of 1% and sensitivity of 0.1 pF/mg.
  • Prototype 2 demonstrated superior batch consistency, crucial for commercialization.
  • Equivalent input-output sensitivity reached 1.2403 pF/%RH, surpassing existing IFE sensors.
  • Optimized prototypes exhibit miniaturized size, low cost, and high consistency.

Conclusions:

  • The proposed methodology successfully yields economic, miniaturized, and high-resolution micro-moisture sensors.
  • The optimized IFE-based sensors demonstrate significant improvements in sensitivity and consistency.
  • These sensors have the potential for substantial impact on various industrial moisture monitoring applications.