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Portable Multichannel Measurement System for Real-Time Microplastics Assessment Using Microwave Sensors.

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Area of Science:

  • Environmental Science
  • Electrical Engineering
  • Sensor Technology

Background:

  • Microplastic pollution is a growing environmental concern requiring effective detection methods.
  • Existing methods for microplastic assessment can be time-consuming and lack real-time capabilities.
  • Microwave sensing offers a promising, non-invasive approach for detecting microparticles in liquids.

Purpose of the Study:

  • To develop and characterize a multichannel electronics measurement system for real-time microplastic assessment.
  • To enable simultaneous detection of microplastics with varying sizes and properties using multiple microwave sensors.
  • To validate the system's performance with microplastic particles in an aqueous flow.

Main Methods:

  • A multichannel system integrating radio-frequency integrated circuits and microprocessors was designed.
  • Excitation signals were generated using an ADF4351 frequency synthesizer (700 MHz–3.5 GHz).
  • An ADL5902 power detector and MSP430FR2355 microprocessor handled signal conditioning, acquisition, and processing.

Main Results:

  • The system demonstrated real-time microplastic detection capabilities in aqueous environments.
  • Characterization confirmed signal generation (700 MHz–3.5 GHz) and sensor output detection (-50 dBm to -5 dBm).
  • Validation showed successful detection of 400 μm polyethylene spheres at a 10 mL/min flow rate.

Conclusions:

  • The developed multichannel system provides a compact and low-power solution for microplastic monitoring.
  • The system's design supports the integration of multiple sensors for comprehensive microplastic analysis.
  • This technology holds potential for advancing environmental monitoring and water quality assessment.