Design of visibility detection system for tunnel based on transmission method

Ye Song; Bai Yunfei; Li Zhiwei; Shi Hailiang; Xiong We; Wang Xinqiang; Wang Jiejun; Zhang Wentao

doi:10.12086/oee.2019.180607

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Ye Song, Bai Yunfei, Li Zhiwei, et al. Design of visibility detection system for tunnel based on transmission method[J]. Opto-Electronic Engineering, 2019, 46(10): 180607. doi: 10.12086/oee.2019.180607

Citation:

Ye Song, Bai Yunfei, Li Zhiwei, et al. Design of visibility detection system for tunnel based on transmission method[J]. Opto-Electronic Engineering, 2019, 46(10): 180607. doi: 10.12086/oee.2019.180607

Design of visibility detection system for tunnel based on transmission method

1.
School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
2.
Anhui Institute of Optics and Fine Mechanics, Key Laboratory of General Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China
3.
Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin, Guangxi 541004, China

Fund Project: Supported by National Natural Science Foundation of China (11703061) and National Key R & D Program of China(2016YFB0500704)

More Information

Corresponding author: Shi Hailiang, E-mail:hlshi@aiofm.ac.cn

Received Date 05 September 2018

Revised Date 06 November 2018

Published Date 18 October 2019

Abstract

Abstract

Tunnel visibility has an important relationship with traffic safety. Real-time monitoring of tunnel visibility can provide a strong basis for ventilation and ventilation of tunnels. Based on the principle of visibility detection by transmission method, a set of visibility detection system is built for automatic detection of tunnel visibility. The detection system is mainly composed of a laser diode, a beam splitter, a silicon detector and a signal processing unit. Two silicon detectors detect the intensity of light before and after attenuation through optical path respectively and output corresponding photocurrent. The signal processing circuit amplifies and filters the output of the detector and converts the output to AD, and then calculates the extinction coefficient. Fixed transmittance filter is used to simulate tunnel environment, and the performance index of the detection system is tested in laboratory environment. The experimental results show that the measurement range of extinction coefficient is 3.37 km^-1~118.82 km^-1, the maximum relative measurement error is 8.4%, and the stability is better than 0.12 km^-1.
- tunnel visibility /
- transmission method /
- extinction coefficient

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References

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Overview

Overview

Overview: With the development of the transportation industry, the number of medium and long road tunnels has been always increasing. Since the tunnel structure has a semi-closed cylindrical configuration, it is difficult to exchange with the outside air, and the exhaust of the vehicle is likely to cause the accumulation of pollutants and to cause a decrease in visibility in the tunnel. Tunnel visibility has an important relationship with driving safety. Real-time monitoring of tunnel visibility can provide a strong basis for tunnel ventilation and ventilation, reduce the probability of accidents under low visibility conditions and improve the tunnel environment. Based on the principle of visibility detection of transmission method, a set of visibility detection system is built for the automatic detection of tunnel visibility. The detection system is mainly composed of a laser diode, a beam splitter, a silicon detector, and a signal processing unit. An LED laser diode with the power of 5 mW and wavelength of 650 nm is used as a detection light source, and two high-reactivity silicon detectors respectively detect the light intensity before and after attenuation by the optical path and output a corresponding photocurrent. A transimpedance amplifier circuit is designed to perform amplification and I/V conversion of the photocurrent signal to meet the detection requirements under low visibility conditions. The signal processing circuit performs amplification filtering and analog-to-digital conversion on the two outputs of the detector, and is collected by the single-chip microcomputer. The extinction coefficient is inversed by the single-chip microcomputer by writing software. According to the calculated extinction coefficient and design threshold, the relay is controlled to be turned on or off to control the motor running in the tunnel. The prototype of the inspection system is designed and fabricated, and the main design parameters including measurement range, maximum measurement error and stability are experimentally analyzed. In order to avoid the influence of background light on the detection system, a 50 cm long shading cylinder and a 4 cm diameter aperture are designed. The tunnels under different visibility conditions are simulated using filters with fixed transmittances of 98.0%, 84.7%, 67.2% and 49.0%, respectively, and the performance indicators of the test system are tested in a laboratory. The experimental results show that the measurement range of the extinction coefficient of the detection system is 3.37 km^-1~18.82 km^-1, the maximum relative measurement error is 8.4%, and the stability within 12 hours is better than 0.12 km^-1. The design indicators meet the requirements for the indicators of tunnel visibility detection instruments in the "Specifications for Design of Highway Tunnels". It laid the foundation for the future commercialization of tunnel visibility testing instruments.