Polytechnic School of Pernambuco, University of Pernambuco (UPE), Recife, PE, Brazil.
Sensors (Basel). 2012;12(3):3438-48. doi: 10.3390/s120303438. Epub 2012 Mar 12.
We present two configurations of an amplified fiber-optic-based corrosion sensor using the optical time domain reflectometry (OTDR) technique as the interrogation method. The sensor system is multipoint, self-referenced, has no moving parts and can measure the corrosion rate several kilometers away from the OTDR equipment. The first OTDR monitoring system employs a remotely pumped in-line EDFA and it is used to evaluate the increase in system reach compared to a non-amplified configuration. The other amplified monitoring system uses an EDFA in booster configuration and we perform corrosion measurements and evaluations of system sensitivity to amplifier gain variations. Our experimental results obtained under controlled laboratory conditions show the advantages of the amplified system in terms of longer system reach with better spatial resolution, and also that the corrosion measurements obtained from our system are not sensitive to 3 dB gain variations.
我们提出了两种基于光纤放大的腐蚀传感器配置，使用光时域反射（OTDR）技术作为询问方法。该传感器系统是多点的、自参考的，没有移动部件，可以在距离 OTDR 设备数公里的地方测量腐蚀速率。第一个 OTDR 监测系统采用远程泵浦在线 EDFA，并用于评估与非放大配置相比系统范围的增加。另一个放大监测系统使用 booster 配置的 EDFA，我们进行了腐蚀测量和系统对放大器增益变化的灵敏度评估。我们在受控实验室条件下获得的实验结果表明，在更长的系统范围和更好的空间分辨率方面，放大系统具有优势，而且我们系统获得的腐蚀测量结果对 3dB 增益变化不敏感。
