The FBG tunnel crustal settlement monitoring system for dam settlement and bridge building health monitoring connects the FBG static level and FBG slit meter with the FBG sensor analyzer through armored optical cable. The FBG sensor analyzer receives the optical signal with measurement information sent by the optical fiber sensor and demodulates it to the measurement value to realize the settlement The on-line measurement of fracture condition forms the historical measurement curve. When the settlement, fracture is too high or the rising trend is abnormal, the alarm will be given, and the settlement, fracture value and historical alarm value of each monitoring point will be saved, so as to provide scientific and accurate data support for the change of crustal settlement.。

Advantages of the system:

1、All optical type, no power supply on site;

2、Not affected by electromagnetic interference and nuclear radiation;

3、High measurement accuracy and resolution;

4、High speed, it can complete the temperature acquisition and transmission of thousands of monitoring points in tens of milliseconds;

5、It can be used in the environment of high temperature, high humidity and chemical erosion for a long time;

6、 Absolute measurement, no zero drift, light source attenuation and line loss do not affect the measurement accuracy, no need for field calibration; 7, do not reduce the safety level of the monitored equipment, sensor and transmission fiber insulation, high voltage resistance, anti creepage, flame retardant;

8、Long distance transmission, the distance can be several kilometers to dozens of kilometers, easy to network;

9、Fast installation and easy maintenance.

Technical features:

1、High precision 

2、High reliability

3、 Fast measurement speed 

4、1-64 channel capacity can be expanded smoothly

 5、Compatible with similar FBG sensors of domestic and foreign manufacturers

Performance index:

Number of channels                                   1 / 4 / 6 / 8 / 16 / 32 / 64 channels (customized according to customer requirements)

Capacity per channel                              Temperature: 1-40; strain: 1-18; displacement: 1-12; pressure: 1-12

Wavelength spacing                                             0.4nm minimum

sampling frequency                                      Synchronous measurement speed is 1-100hz

Overall dimension                                        430mm×350mm×88mm    

Temperature resolution                                   0.1 ℃; measurement accuracy: ± 0.5 ℃ 

Strain                                 Resolution: ＜ 0.1% F.S.; measurement accuracy: ＜ 0.3% F.S

Displacement                                 Resolution: ＜ 0.1% F.S.; measurement accuracy ＜ 0.3% F.S

working voltage                                       220V±10%，50Hz

Maximum power consumption                                      Typical value: 30W; maximum value: 40W

data interface                                    Support 100M Ethernet port and RS485 output

Working environment / humidity                           -No condensation at 10 ~ 55 ℃ / 0 ~ 80% RH

Storage environment / humidity                           -No condensation at 20-80 ℃ / 0-95% RH

Wavelength range                                           1525~1565m