Urban utility tunnels integrate critical infrastructure – power, communication, gas, water supply, and drainage – into a single corridor, serving as the lifeline of a city’s safe and reliable operation. Ensuring efficient, accurate, and around‑the‑clock health monitoring of this buried lifeline is a core challenge in smart city development. In collaboration with AP Sensing, a global pioneer in distributed fiber‑optic sensing technology, MRD™ introduces the APSensing‑MRD Utility Tunnel Health Monitoring System. Built on proven technology validated across hundreds of projects worldwide over decades, the system is centered on Distributed Fiber‑Optic Sensing (DFOS), integrating DTS (Distributed Temperature Sensing), DAS (Distributed Acoustic Sensing), and the SmartVision intelligent software platform. Together, they deliver an integrated, highly reliable, and maintenance‑free monitoring solution – covering fire pre‑warning, pipeline leak detection, third‑party intrusion prevention, and structural safety for utility tunnels.
As urban underground development enters a finer phase, traditional point-sensor video schemes (smoke/temperature) show clear shortfalls:
Monitoring discontinuities
The point sensor is stored in the blind area and cannot cover the long-distance pipe gallery.Response lag after
Often in fire, leakage has occurred and after the impact before the alarm.Lack of synergy
Each subsystem works independently, making it difficult for achieves linkage analysis and unified situational awareness.
Given the uniqueness and complexity of tunnel projects, we provide full-lifecycle professional assurance from design to O&M:
Distributed fiber optic sensing for fire monitoring, etc. Critical safety scenarios.
Applied to comprehensive tunnel safety monitoring.
Applied to busbar monitoring, etc. Benchmarking project, MRD provides this localized rapid response and technical support.
Supports 24 Ethernet ports including 8×2.5G SFP; any two ports can form a self-healing ring with multiple independent rings; QoS (IEEE 802.1p/1Q and ToS/DiffServ); SNMPv1/v2c/v3
MoreEvery solution is built on relentless pursuit of product fundamentals. We disclose the following design details for the most demanding engineering review:
MTBF (Mean Time Between Failures)
Device-level stress prediction based on the SR-332 algorithm; system MTBF exceeds one million hours.
Service Life
Not only datasheet ratings—measured estimates based on electrolytic capacitor capacitance fade at minimum operating parameters @ operating temperature.
Technology rooted in HP/Agilent 35+ years of leadership in fiber measurement and testing; quality proven over time.
Hundreds of global installations including Channel Tunnel fire monitoring, Japanese chemical-plant tunnel safety, and Korea National Bank busbar monitoring. MRD Meridian provides localized rapid response and technical support.
Laser source meets the highest safety class; circuits are ATEX Zone 0 certified for utility tunnels with flammable gases.
Hotline: 86-21-58330762
Zip: 201203
Email: sales@mrdcom.net
Address: No.123 Curie Road, China (Shanghai) Pilot Free Trade Zone
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Using Raman scattering, turn one communications fiber into thousands of continuous temperature sensors.
Supports up to 24 channels with a maximum detection range of 50 km per channel. Using a single sensor (single detector) solution, there is no need to calibrate again after leaving the factory; support double-ended measurement, eliminate the impact of loss, and have higher accuracy. Temperature accuracy standard deviation ± 0.6 ℃, measuring range -250 ℃ to +750 ℃.
Cable temperature in-line monitoring:Real when monitoring the temperature of the high-voltage cable connector and this body to warn of the risk of overheating.
Early Fire Detection:Quickly find and precisely locate (meter-level accuracy) the fire source, the sensor cable can passes IEC60331-25standard test, and the maintenance function at 750 °C is at least 2 small when.
Pipe Leak Monitoring:passes Analyze the abnormal temperature of soil or pipe wall around the leak point to accurately locate the leak location.
Using coherent Rayleigh scattering to detect faint vibration/sound along the fiber—turning fiber into a distributed microphone.
provides 10km @ 4KHz, 20km @ 2KHz, 40km @ 1KHz, etc. Various probe range configurations. Good impact and vibration resistance (compliant with IEC 60068-2-6: 2007) and electromagnetic compatibility (passes EN 61326-1: 2013 test). Laser source meets IEC 60825: 2007 1M, etc. Grade, with ATEX 0 zone this quality safety certification.
Third-party intrusion detection:Actual when monitoring manual excavation, mechanical construction around the pipe gallery, etc. Invasion for, and precise positioning to prevent damage.
Perimeter Security:can is laid along the pipe gallery or station fence to form a vibration fence without blind spots.
Structural health monitoring:Capture wall deformation, settlement, etc. Weak stress waves are generated to assess structural safety.
