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Advances in Optical Based Turbidity Sensing Using LED Photometry (PEDD).

Cormac D Fay1, Andrew Nattestad2,3

  • 1SMART Infrastructure Facility, Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia.

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|January 11, 2022
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Summary
This summary is machine-generated.

A new Paired Emitter-Detector Diode (PEDD) technique offers a superior, low-cost method for measuring water turbidity. This advancement is ideal for widespread environmental monitoring and Internet of Things (IoT) sensor deployments.

Keywords:
ISO 7027LODNTUPEDDlow-costlow-powerphotodiodequalitysensitivityturbiditywater

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Area of Science:

  • Environmental Science
  • Water Quality Monitoring
  • Sensor Technology

Background:

  • Turbidity is a key water quality indicator, crucial for health and environmental assessments.
  • Current centralized analysis methods and high costs limit large-scale autonomous water quality monitoring using wireless sensor networks (WSNs).

Purpose of the Study:

  • To introduce and evaluate a novel Paired Emitter-Detector Diode (PEDD) technique for quantitative turbidity measurement.
  • To assess the PEDD technique's performance against conventional methods for potential use in low-cost, low-power sensors.

Main Methods:

  • Quantitative turbidity measurements were performed using analytical grade calibration standards.
  • The Paired Emitter-Detector Diode (PEDD) technique was compared to conventional photodiode-LED arrangements.
  • Performance was evaluated based on spectral sensitivity, cost, power consumption, sensitivity, limit of detection, and physical arrangement according to ISO 7027 standards.

Main Results:

  • The PEDD technique demonstrated superior performance across all evaluated metrics, including spectral sensitivity, cost-effectiveness, and power efficiency.
  • It achieved a lower limit of detection and favorable physical arrangement compared to traditional methods.
  • The PEDD approach aligns with the ISO 7027 turbidity sensing standard.

Conclusions:

  • The Paired Emitter-Detector Diode (PEDD) technique is highly suitable for developing low-cost, low-power turbidity sensors for Internet of Things (IoT) applications.
  • This technology has the potential to significantly reduce device and per-measurement costs for environmental monitoring deployments.
  • The findings pave the way for more accessible and widespread water quality assessment.