KEYWORDS: Sensors, Bridges, Fiber Bragg gratings, Demodulation, Data acquisition, Data centers, Data storage, Temperature sensors, Computing systems, Optical fibers
Based on optical fiber grating sensing technology,the bridge bearing displacement was monitored for a long term
online.The sensor performance and its installation method were analyzed.The structure of the monitoring system was
studied,the data acquisition system was realized.The 3G network which transfered the data remotely and data storage
method were discussed to build a remote data center. The composition of the database was proposed, and the relation
between the displacement and the temperature for the bridge bearing was discussed on the historical data.The basis on
the bridge safety monitoring was provided.
For the traditional resistance strain sensor's shortage,for example,their stability,durability and monitoring scorpe could
not satisfied the requirement of bridge monitoring system,put forward to adopt advanced fiber-optic bragg grating sensor
and its technology to build up the bridge health monitoring system.Analysed the application scope and aim of difference
kinds of fiber bragg grating sensors used, including stress strain sensors,temperature sensors,crack sensors and testing
force ring sensors.According to the key construction sections as the project designed,expatiated their specific installation
methods and construction craftwork in Wuhan Yangtze River 2th bridge.It formed distributed fiber sensing network of
bridge with large-scale located fiber-optic bragg grating sensors, and pointed out the becareful prodeeding when to link
no more than twenty sensors to one fiber for the demodulator precision.Discussed how to construct the data acquisition
system and its function via the sensors and their demodulator.One fiber of the linked sensors connected to one channel of
the demodulator and all together reached sixteen channels.The demodulator were connected to the switch through rj45
interface and communicated with the acquisition server.Designed the software program of data acquisition software
system and the database,which used the Sqlite of the embed database to storage the configure information and receive
the data through the TCP/IP protocol.It has been build a bridge health monitoring system base on fiber bragg grating
technology.
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