The tunnel visibility detector works based on the principle of transmission, with the transmitter/receiver ａnd reflector installed relative to each other. After being fixed ａnd aligned with a bracket, the highly focused beam emitted by the optical components becomes a detection beam, with an installation distance interval of 3 meters (round-trip dual optical path, actual detection optical path is 6 meters). Due to the attenuation of dust, the receiver obtains the signal ａnd processes it into the measurement value. According to the requirements of the "Design Specification for Ventilation ａnd Lighting of Highway Tunnels" in China, it is installed on the or side walls of the tunnel.

The intelligent detector comes with a built-in compensation function, which can automatically perform gain compensation when the optical lens is contaminated, ensuring a longer maintenance cycle. A tunnel is a special tubular structure that, due to its small space ａnd airtightness, emits exhaust gases from vehicles passing through the tunnel. If not discharged in a timely ａnd reasonable manner, it can cause the accumulation of CO ａnd suspended particles, which will directly affect the personal safety of vehicle drivers, passengers, ａnd maintenance personnel passing through the tunnel.