Portable FBG based optical sensor array

Fiber Bragg grating (FBG) sensors have become quite common in many applications for monitoring strain, temperature and similar. These systems are usually fixed since the FBG interrogation unit is sensitive to the environment and therefore mounted into the equipment cabinet. However, a portable FBG interrogation unit would be of great benefit in applications where there is no need for continuous monitoring. For this reason here we propose a portable interrogation system based on a temperature stable SLED broadband source, calibrated tunable optical filter and an adaptive peak search algorithm.