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Tunnel Monitoring Applications

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    Road tunnel atmosphere monitoring

    CODEL`s road tunnel monitors are designed exclusively for road tunnel applications. It offers a family of tunnel sensors that provide all the essential measurements necessary to monitor the tunnel atmosphere.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Tunnel solutions for the light sensors

    According to the International Committee on Illumination CIE recommendations, luminance should be monitored as the luminance contained within in a conical field of view, subtending an angle of 20º. It is recommended that a luminance photometer is mounted in the tunnel approach road approximately 120 - 200 metres from the portal, depending on the approach speed of the vehicles and their stopping distance. The purpose of monitoring the luminance at the portal is to adjust the level of light intensity inside the road tunnel to the light intensity outside so that drivers do not have to adjust their eyes quickly or become affected by the “black hole” effect where they decelerate rapidly and become a hazard to other road users.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Tunnel solutions for the tunnel air flow

    Tunnel ventilation systems are designed to enable a sufficient throughput of air to be maintained to ensure a safe operating environment for users. These systems consume large amounts of power and need to be operated as efficiently as possible. To do this it is necessary to know the effectiveness of the system in terms of air flow and direction developed within the tunnel. The TunnelTech 301 is a single point ultrasonic flow monitor that is unaffected by traffic flow and sound reflections. It is designed to withstand the harsh tunnel environment and has a working range of 0-20 metres/second in both directions.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Tunnel solutions for the visibility monitor

    The TunnelTech 101 Visibility Monitor (VIS), is an essential part of any road or rail tunnel safety system. It monitors the Visibility within the tunnel and ensures that the tunnel ventilation system provides sufficient clean air for drivers to clearly see the road ahead. The TunnelTech 102 Cold smoke monitor (CSM detects smoke from a fire to rapidly warn the operator of the hazard. Secondly, used in combination with other TunnelTech 101 VIS monitors, the operator can quickly detect the locus of the fire if it is also equipped with the optional PT 101 temperature sensor to accurately measure ambient air temperature in a range of -15 to 1050C.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Tunnel solutions for the gaseous pollutants

    The TunnelTech 200 series are primarily gas monitors with optional Visibility capability. Most use Infra-red absorption technology to monitor gaseous pollutants and those with a visibility channel use optical attenuation for that application. All TunnelTech 200 analysers except the TunnelTech 205 use the same rugged corrosion resistant enclosures and have an optional Data Display unit. As there is only one moving part so reliability levels are very high and maintenance levels very low.

    By Codel International Ltd based in Bakewell, UNITED KINGDOM.

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    Ambient air quality monitoring solutions for tunnel monitoring

    Car tunnels need ventilation in order to keep air pollution below the limits. When the pollution levels reaches a setpoint, the fans must be started and kept running until the pollution levels decreases.

    By Opsis AB based in Furulund, SWEDEN.

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    Emissions Monitoring for Tunnels

    The Opsis monitoring solution is designed for high-quality gas measurement in traffic tunnels. The monitoring systems have been approved by the Germany TÜV and the U.S. EPA among others.

    By Opsis AB based in Furulund, SWEDEN.

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    Air Flow Monitoring for Tunnels

    By Optical Scientific Inc. (OSi) based in Gaithersburg, MARYLAND (USA).

  • Smoke generator device for wind tunnel studies

    For producing a point source of smoke in a wind tunnel environment, Concept have the Aerotech smoke system, with a heated tip on the end of a thin wand. For seeding a wind tunnel for LDA/PVA type work the ViCount 1300 system is normally supplied. This can produce either water or oil based smoke with minor re-programming, so it is a very adaptable solution. The ViCount is such a versatile machine, that its capable of everything from seeding the world’s largest wind tunnel (NASA AMES) through to producing fine smoke rakes in educational wind tunnels.

    By Concept Smoke Systems based in Maidenhead, UNITED KINGDOM.

  • Tunnel Structural Health Monitoring Systems

    Structural Health Monitoring allows rapid assessment of a tunnel’s state of health and such approach is becoming recognized as an appropriate mean to increase the safety and optimize operational and maintenance activities of tunnels. Data resulting from the monitoring program is used to improve the operation, the maintenance, the repair and the replacement of the structure based on objective results. Detection of ongoing damages can be used to discriminate deviations from design performance. Malfunctioning tunnels can often have serious consequences. The most severe are failures involving human victims. Even when there is no loss of life, populations suffer if the structure is partially or completely out of service. Learning how a tunnel performs in real conditions will help design better structures for the future. This can lead to cheaper, safer and more durable structures with increased reliability, performance and safety.

    By Roctest - part of Nova Metrix LLC based in Saint-Lambert, QUEBEC (CANADA).

  • Smoke generator device for large scale external exercises and tunnel testing

    Making smoke in a very open environment or external environment can be a challenging! An oil-based smoke generator, such as a ViCount system, can produce dramatically more artificial smoke than multiple water based systems. This is due to the fact that the smoke ViCounts produce, being oil-based, does not evaporate in the same way and speed that water-based smoke does. The smoke from a ViCount smoke generator will travel for 1000`s of meters, compared to a typical water based smoke machine that may produce a smoke visible for 100 meters. Just one ViCount or Vulcan can replace 10 or more conventional water based smoke systems. ViCount`s have been used world wide for many tunnel smoke simulations, be it for RTA training / evacuation exercises or tunnel ventilation testing.

    By Concept Smoke Systems based in Maidenhead, UNITED KINGDOM.

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