Development of a New Method for Turbidity Measurement Using Two NIR Digital Cameras

Yuanyang Zhu; Pingping Cao; Sheng Liu; Ying Zheng; Chaoqun Huang

doi:10.1021/acsomega.9b04488

Development of a New Method for Turbidity Measurement Using Two NIR Digital Cameras

ACS Omega. 2020 Mar 2;5(10):5421-5428. doi: 10.1021/acsomega.9b04488. eCollection 2020 Mar 17.

Authors

Yuanyang Zhu¹, Pingping Cao¹, Sheng Liu¹, Ying Zheng¹, Chaoqun Huang²

Affiliations

¹ College of Computer Science and Technology, Huaibei Normal University, Huaibei 235000, China.
² Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Science, Hefei 230031, China.

Abstract

This paper proposes a new method of using two NIR digital cameras to measure water turbidity accurately and quickly. A measuring device based on an NIR camera and image processing software is designed. Two NIR cameras collect scattered and transmitted images when the NIR light is passing through the turbid solution. The average RGB values of 400 pixels in the central region of the image are obtained and converted into CIE Lab color space values. The water turbidity was measured by the functional relationship between turbidity and the corresponding color components (R, G, B, L, a, b, and grayscale). The results of comparison with a commercial turbidimeter show that this method has a high accuracy for the determination of standard solution with wider linear range and is consistent with the turbidimeter results for the measurement of real samples, which verifies the feasibility of this method.