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Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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Microfluidic Microwave Sensor for Detecting Saline in Biological Range.

Joni Kilpijärvi1, Niina Halonen2, Jari Juuti3

  • 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland. joni.kilpijarvi@oulu.fi.

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Summary

This study presents a novel microwave sensor for real-time analysis of small biological liquid volumes. The printed circuit board (PCB) and polymethylsiloxane (PDMS) based device accurately detected sodium chloride (NaCl) levels in water.

Keywords:
IDERF sensorlab-on-a-chipmicrofluidic sensing

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Area of Science:

  • Biomedical Engineering
  • Microwave Sensing Technology
  • Analytical Chemistry

Background:

  • Real-time measurement of small biological liquid samples is crucial for diagnostics.
  • Microwave sensors offer a non-invasive method for liquid analysis.
  • Printed circuit board (PCB) and polymethylsiloxane (PDMS) are cost-effective materials for sensor fabrication.

Purpose of the Study:

  • To develop and validate a novel microwave sensor for real-time analysis of biological liquid samples.
  • To assess the sensor's performance using a prototype combining PCB and PDMS microfluidic channels.
  • To demonstrate the sensor's capability in detecting clinically relevant concentrations of sodium chloride (NaCl).

Main Methods:

  • Simulation, fabrication, and testing of a microwave reflection sensor.
  • Integration of a vacuum-powered sample delivery system with robust fluidic ports.
  • Utilizing a broad frequency band (150 kHz to 6 GHz) with three resonance frequencies for sensing.

Main Results:

  • A functional prototype sensor was successfully manufactured and tested.
  • The sensor demonstrated a broad operational frequency band.
  • The device accurately detected NaCl concentrations within the typical range of healthy human blood plasma (125-155 mmol).

Conclusions:

  • The developed microwave sensor is a promising tool for real-time, small-volume biological liquid analysis.
  • The combination of PCB and PDMS offers a low-cost approach for sensor construction.
  • This technology has potential applications in point-of-care diagnostics and biochemical monitoring.