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Open AccessArticle

Thickness Measurement of Water Film/Rivulets Based on Grayscale Index

by Haiquan Jing 1,2, Yi Cheng 1, Xuhui He 1,2,*, Xu Zhou 3 and Jia He 4
1
School of Civil Engineering, Central South University, Changsha 410075, China
2
National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China
3
Chongqing Wanqiao Communication-Tech Co.Ltd., Chongqing 400067, China
4
School of Civil Engineering, Hunan University, Changsha 410075, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(23), 2871; https://doi.org/10.3390/rs11232871
Received: 15 October 2019 / Revised: 28 November 2019 / Accepted: 29 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Vision-Based Sensing in Engineering Structures)
This study proposed a nonintrusive and cost-efficient technique to measure the thickness of a thin water film/rivulet based on the grayscale index. This technique uses millions of probes and only needs a digital camera, fill lights, and pigment. For water colored with diluted pigment, the grayscale index of the water captured by a digital camera depends on the water thickness. This relationship can be utilized to measure the water thickness through digital image processing. In the present study, the relationship between the grayscale index and water thickness was theoretically and experimentally investigated. Theoretical derivation revealed that when the product of water thickness and the color density approaches to 0, the grayscale index is inversely proportional to the thickness. The experimental results show that under the color density of 0.05%, the grayscale index is inversely proportional to the thickness of water film when the thickness is less than 6 mm. This linear relationship was utilized to measure the distribution and profile of a water rivulet flowing on the lower surface of a cable model. View Full-Text
Keywords: vision measurement system; image processing; grayscale index; non-intrusive measurement; multi-point measurement; measurement of water film vision measurement system; image processing; grayscale index; non-intrusive measurement; multi-point measurement; measurement of water film
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MDPI and ACS Style

Jing, H.; Cheng, Y.; He, X.; Zhou, X.; He, J. Thickness Measurement of Water Film/Rivulets Based on Grayscale Index. Remote Sens. 2019, 11, 2871.

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