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Cleaning Test for Highway Tunnel Cameras Based on High-pressure Water Jet and Robotic Arms
(1. National Engineering Research Lab of Highway Maintenance Equipment, Chang′an University, Xi′an 710064; 2. Key Laboratory of Road Construction Technology and Equipment under the Ministry of Education, Chang′an University, Xi′an 710064; 3. Shaanxi Highway Electronic Engineering Co., Ltd, Xi′an 710054)
Abstract To address the problem of low efficiency and potential safety hazards in the cleaning of highway tunnel cameras at height, this study proposes a high-pressure water jet method to clean the lens surfaces of the cameras, and designs a cleaning device with six-degree freedom. The composition of the contaminants is analyzed using the Fourier transform infrared spectrometer (FTIR) based on the contaminants on the surface of the tunnel cameras. To achieve a good combination of parameters for the cleaning process, 70 camera samples are collected in the tunnels around the Yuhua Palace in Shaanxi Province, and a cleaning parameters optimization test is carried out through the single factor variable method. Then, the images are processed through the method of "graying + sharpening + binarization", so as to investigate the impact of the cleaning pressure (0.5~2 MPa), the cleaning spacing (0.3~1.5 m), and cleaning time (0.2~2 s) on the cleaning efficiency. The test results show that the main components of the contaminants on the shell surface of the tunnel cameras are carbon black and PAHs, while those on the lens surface are mainly particulate fugitive dust.The better combination of parameters for the cleaning process is as follows: cleaning pressure 0.5 MPa, cleaning spacing 1 m, and cleaning time 0.4 s (clean twice with an interval of 0.2 s). In this combination of parameters, the clean?ing efficiency is over 99%.
Abstract：
To address the problem of low efficiency and potential safety hazards in the cleaning of highway tunnel cameras at height, this study proposes a high-pressure water jet method to clean the lens surfaces of the cameras, and designs a cleaning device with six-degree freedom. The composition of the contaminants is analyzed using the Fourier transform infrared spectrometer (FTIR) based on the contaminants on the surface of the tunnel cameras. To achieve a good combination of parameters for the cleaning process, 70 camera samples are collected in the tunnels around the Yuhua Palace in Shaanxi Province, and a cleaning parameters optimization test is carried out through the single factor variable method. Then, the images are processed through the method of "graying + sharpening + binarization", so as to investigate the impact of the cleaning pressure (0.5~2 MPa), the cleaning spacing (0.3~1.5 m), and cleaning time (0.2~2 s) on the cleaning efficiency. The test results show that the main components of the contaminants on the shell surface of the tunnel cameras are carbon black and PAHs, while those on the lens surface are mainly particulate fugitive dust.The better combination of parameters for the cleaning process is as follows: cleaning pressure 0.5 MPa, cleaning spacing 1 m, and cleaning time 0.4 s (clean twice with an interval of 0.2 s). In this combination of parameters, the clean?ing efficiency is over 99%.
WANG Chao1,
2 YANG Yusheng1,
2 ZHANG Jun1 etc
.Cleaning Test for Highway Tunnel Cameras Based on High-pressure Water Jet and Robotic Arms[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 238-246
2023, Vol. 60 