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Yuanyang Zhu1, Pingping Cao1, Sheng Liu1

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|March 24, 2020
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Summary

This study introduces a novel, rapid method for measuring water turbidity using two near-infrared (NIR) cameras and image processing. The technique accurately determines turbidity by analyzing light scattering and transmission, offering a viable alternative to commercial turbidimeters.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Optical Engineering

Background:

  • Accurate and rapid water turbidity measurement is crucial for environmental monitoring and water quality assessment.
  • Traditional turbidimeters can be expensive and may have limitations in certain applications.
  • Developing cost-effective and efficient methods for turbidity determination is an ongoing research area.

Purpose of the Study:

  • To propose and validate a new method for measuring water turbidity using two near-infrared (NIR) digital cameras.
  • To design and implement a measuring device incorporating NIR cameras and image processing software.
  • To establish the accuracy and feasibility of the proposed method compared to commercial turbidimeters.

Main Methods:

  • Utilizing two NIR digital cameras to capture scattered and transmitted light images of turbid water samples.
  • Employing image processing software to analyze the central regions of the captured images.
  • Calculating average RGB values, converting them to CIE Lab color space, and correlating these values with turbidity measurements.

Main Results:

  • A strong functional relationship was established between water turbidity and various color components (R, G, B, L, a, b, grayscale).
  • The proposed method demonstrated high accuracy for standard solutions, exhibiting a wider linear range than some conventional methods.
  • Measurements of real water samples showed consistency with results obtained from a commercial turbidimeter, confirming the method's practical applicability.

Conclusions:

  • The developed NIR camera-based system provides an accurate and rapid method for water turbidity measurement.
  • This technique offers a feasible and potentially cost-effective alternative for both laboratory and field applications.
  • The study validates the use of image analysis from NIR cameras for quantitative assessment of water turbidity.