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The “Invisible Guardian” in Tunnels: Thermal Imaging and Visible Light Dual-Spectrum Fusion Leaves No Hiding Place for Fires
Jun 11,2026
I. The greatest fear in a tunnel fire is discovering it too late.
Once a vehicle fire occurs inside a high-speed tunnel, the risks are far more complex than on ordinary roads. The tunnel’s enclosed space prevents smoke from dispersing quickly, making it difficult to evacuate vehicles and limiting access for rescue operations. By the time visible flames or thick smoke are detected, the scene has already escalated into a high‑risk situation.
Vehicle fires typically do not erupt suddenly without warning. Overheated tires, abnormal braking, elevated temperatures in the engine compartment, and localized heat buildup in cargo can all initially manifest as unusual temperature readings.
The problem is that standard cameras cannot detect temperature; on-duty personnel can only see a vehicle’s exterior and its passage status, making it difficult to determine in advance which vehicles are overheating.
Therefore, tunnels require a monitoring device capable of “seeing temperature.” The dual‑light fusion temperature‑measurement system was developed precisely to address this challenge.
II. Thermal imaging detects high temperatures, while visible light is used to confirm the vehicle.
The advantage of thermal imaging is its ability to detect heat sources; it can directly display on a thermal map which parts of a vehicle are at abnormal temperatures. By contrast, visible-light imaging excels at revealing a vehicle’s exterior, lane position, direction of travel, and the surrounding environment.
If only thermal imaging is available, the operators in the control room may detect a high‑temperature spot in the scene, but the vehicle’s details remain insufficiently clear.
If only visible light is available, vehicles can be seen clearly, but early-stage temperature anomalies may remain entirely undetectable.
Dual‑light fusion combines the two, enabling both clear vehicle detection and thermal‑source identification.
The TX9800 features high-performance visible-light and infrared thermal imaging sensors, enabling real-time fusion of thermal and visible imagery to enhance image detail and information richness.
This is highly practical for high-speed tunnels: once a hot spot is detected, it can immediately be pinpointed to the specific vehicle, lane, and area where the anomaly is occurring.
3. Over-temperature alarms in the backend eliminate the need for on-duty personnel to constantly stare at the screen.
One of the biggest challenges with traditional surveillance is its reliance on human operators monitoring screens. Tunnel surveillance systems generate a high volume of video feeds, handle heavy traffic, and operate over extended periods, making it impossible for on-duty personnel to continuously scrutinize every vehicle in detail.
The significance of the dual‑light fusion temperature‑measurement system is to transform “manual anomaly detection” into “system‑initiated proactive alerts.”
The system can measure the temperature of key vehicle areas; when the temperature exceeds the threshold, it triggers an over-temperature alarm in the backend, enabling on-duty personnel to focus on vehicles exhibiting anomalies.
The TX9800 supports configurable temperature‑measurement rules, enabling various measurement modes such as point, area, and line, and accommodates multi‑scene, multi‑rule temperature monitoring. It also features alarm output and interlock functionality.
This type of alarm system can reduce missed alerts and enhance tunnel management efficiency.
IV. Vehicle temperature screening inside tunnels: focusing on three key risk categories.
Tunnel vehicle temperature monitoring is not a matter of taking just any temperature reading; rather, it must be conducted with a focus on early‑stage fire‑risk hotspots.
The first category is the tire and braking systems. On long downhill grades, under heavy loads, or after frequent braking, tires and the braking system may experience abnormal temperature rises.
The second category encompasses the engine compartment and the underbody. Engine overheating, electrical wiring faults, and mechanical friction can all manifest as localized high temperatures.
The third category is the cargo and car‑body area. Certain hazardous chemicals, flammable goods, or non‑standard cargo may pose a risk of temperature rise.
Using thermal imaging, the system can perform area‑based temperature measurements; via visible‑light imagery, operators in the control room can verify vehicle type and location; and platform alerts enable rapid identification of vehicles exhibiting abnormal behavior.
V. Tunnel environments require engineering-grade stability.
High-speed tunnels are not typical indoor surveillance environments. Front-end devices are subjected to prolonged exposure to vehicle exhaust, dust, vibration, fluctuating humidity, and continuous operation. If the equipment is unstable, even the most intelligent alarm systems will be rendered ineffective.
The TX9800 features an IP67 protection rating, supports a wide operating temperature range, and incorporates lightning‑ and surge‑protection design, making it ideal for long‑term operation in complex and harsh environments.
Such capabilities are critical for tunnel projects, as tunnel safety systems must not only perform reliably during testing but also operate stably in everyday traffic conditions—continuously monitoring, issuing timely alerts, and maintaining continuous records.
VI. True value lies in preventing fire risks before they escalate into open flames.
The tunnel dual‑light fusion temperature‑monitoring system is neither intended to replace the fire‑protection system nor to supplant manual management. Its value lies in detecting abnormal vehicle temperatures well before a fire can develop.
When the system detects that a vehicle has overheated, the backend can implement a variety of response measures:
Remind vehicles to exit via the information display board;
Alert drivers via broadcast;
Notify tunnel inspection personnel or traffic police;
Guide vehicles into the safe zone;
Save alarm videos and heatmaps as records.
This is the essence of the “Invisible Guardian”: it does not impede vehicle traffic under normal conditions, but proactively issues an alert when anomalies are detected.
Summary
In tunnel vehicle fire prevention and control, we cannot rely solely on detecting smoke and flames. The truly effective approach is to identify anomalies at the very early stage of abnormal temperature rise.
The SSK/NW-TX9800 tunnel‑specific dual‑spectrum temperature‑measurement system uses visible‑light imaging to identify vehicles and thermal imaging to detect temperature anomalies, triggering an over‑temperature alarm in the backend. This elevates tunnel monitoring from “viewing video” to “assessing risks.”
Such systems are particularly well-suited for vehicle temperature monitoring, early fire detection, and intelligent tunnel safety management in highway tunnels.
Corresponding Device Orientation (Important)
For different application scenarios, common corresponding device orientations include:
- Product link: https://www.settall.com/products_details/SSK/NW-TX9800.html
- Product Name: Tunnel-Specific Dual-Optical Fusion Temperature Measurement System
- Product Model: SSK/NW-TX9800
Contact Us
Tel:13001168699/13021219308
EMAIL:Guojin@settall.com
8th Floor, Building 14, Zone 7, Headquarters Base, West Outer Ring Road, Fengtai District, Beijing
Contact
EMAIL:Guojin@settall.com
8th Floor, Building 14, Zone 7, Headquarters Base, West Outer Ring Road, Fengtai District, Beijing
