Optical Engineering • Open AccessReview on hydrogen leak detection: comparison between fiber optic sensors based on different designs with palladium
A review of optical fiber hydrogen sensors based on palladium (Pd) is presented. Palladium hydrogen optical fiber sensing systems can be considered as a model for other metal hybrid systems. In addition, the Pd hydrogen systems are well characterized in bulk, cluster, or thin film form. We focus on the fiber principles. We then discuss their performances regarding their configurations. We will conclude by introducing the challenges in designing an ideal hydrogen optical fiber sensor based on a metal hybrids approach and which design direction is considered the best to take.