Transmission-type tunnel fire monitoring device and monitoring method

Abstract

The invention provides a transmission-type tunnel fire monitoring device. The transmission-type tunnel fire monitoring device comprises at least one pair of transmitting units, receiving units, optical fibers and an upper computer, wherein the transmitting units and the receiving units are erected at opposite positions in a tunnel; the optical fibers are connected with the transmitting units and the receiving units; the light path part of the transmitting unit comprises a laser, a spectroscope, a first lens, a first photoelectric detector and a beam expander, and the circuit part of the transmitting unit comprises a filtering and amplifying circuit, an analog-to-digital conversion circuit and a transmitting end wireless communication module; the light path part of the receiving unit comprises a second lens and a second photoelectric detector; the circuit part of the receiving unit comprises a lock-in amplifier, an analog-to-digital conversion circuit and a receiving end wireless communication module; a light path adopts a double-end structure, and a modulated light beam emitted by a laser is divided into two paths by a spectroscope. The invention also provides a fire monitoring method adopting the device. The device has the advantages of good stability and high precision.

Description

technical field [0001] The invention relates to a fire monitoring device in a tunnel, which is based on photoelectric technology and designed for fire monitoring and early warning in the tunnel. The device realizes the non-contact fire early warning function in the tunnel site through real-time monitoring of the extinction coefficient of the atmosphere in the tunnel, and is used for long-term online monitoring and alarm of fires in tunnels in railways and highways. Background technique [0002] As the throat of traffic, the tunnel has a complex building structure and a closed environment. Most of the building structures are narrow and long, with small spaces, small roads, and poor ventilation conditions. Various types of accidents in tunnels may lead to fires, such as failure of the vehicle itself, collision of vehicles, fire of transported goods, etc. Due to the structural characteristics of the tunnel, once a fire breaks out, the burning speed of the fire in the tunnel is...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the temperature field in the tunnel itself changes greatly, which is prone to false alarms and false alarms. In addition, the response time is long, and the effect of early warning cannot be truly realized.

Distributed fiber optic detectors are also greatly affected by the external temperature

There are many problems with dual-wavelength flame detectors, such as being susceptible to light pollution, and when an accident is judged, the detector may not be triggered due to poor visibility in the tunnel. In addition, the system has high requirements for maintenance

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