Bridges occupy an important position in the transportation and economic development of a country. Bridge defect detection and structural health monitoring are important means to ensure the safe operation of bridges. Generally speaking, bridges have very high requirements for safety, reliability, durability, and stability. In the course of using the bridge, how can we monitor the bridge in real time? The temperature sensor solves this problem for us. The application of the temperature sensor in the bridge can realize the long-term real-time monitoring of the health of the bridge structure and provide a basis for the future assessment of the damage status of the bridge.
Bridge structure health monitoring
Bridge structure health monitoring (SHM) is a sensor-based active defense method that can make up for the current safety performance is very important structure, the sensor network is placed in bridges, buildings and aircraft, the use of sensors for SHM detection is a reliable And it is not an expensive method, and the formation of defects can be detected in the first time. Such a network can report defects in key structures to maintenance personnel early, thus avoiding catastrophic accidents.
Types of temperature sensors in fiber grating sensors
The traditional bridge defect detection mainly uses the strain measurement technology of electrical sensors. This method has the problems of being susceptible to electromagnetic interference, complex wiring, and low timeliness. The measured instantaneous results cannot accurately and continuously predict the working state of the bridge. The main advantages of Fiber Bragg Grating (FBG) sensors compared to traditional electrical detection technology are: good durability, suitable for long-term monitoring; no sparks, suitable for special monitoring fields; both point measurement and quasi-distributed Measurement, etc. These advantages make the fiber Bragg grating sensor widely concerned in the field of civil engineering, especially in the field of bridge inspection.
The temperature sensor specific to the fiber grating sensor can be divided into civil engineering (requires good sealing, waterproof, moisture-proof, anti-corrosion), electric power (requires insulation pressure resistance, high temperature resistance) and petrochemical (requires explosion-proof) temperature sensor , According to the installation method, it can be divided into surface type (installed on the surface of the object to be measured) and embedded type (for civil engineering monitoring, embedded in the concrete structure), according to the fiber output method, it can be divided into single-ended sensors (applied to high-voltage power Switchgear) and double-ended sensors (applied in tunnels, large structures, bridges, cable trenches, oil tanks and other industries).
The role of temperature sensors in bridge monitoring
In the process of concrete construction, the digital temperature sensor is installed in a metal sleeve with good thermal conductivity to ensure that the sensor responds quickly to changes in concrete temperature. Each temperature monitoring metal tube is connected to a wireless temperature node. The wireless temperature node of the entire site is transmitted to the construction monitoring center through the wireless network. There is no need to lay long cables on the construction site. The installation and deployment are convenient, which can effectively solve the temperature measurement point because The problem of low survival rate caused by construction personnel damaging the cable.
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