Structure design and application of hollow core microstructured optical fiber gas sensor: A review

Gas sensors play an important role in the increasing trend of industrial automation in recent years. Hollow core microstructured optical fibers have become a popular material for gas sensors because of their unique structure and excellent performance. In this paper, the hollow-core microstructured optical fiber gas sensors are divided into two types (interferometric type and absorptive type) according to the sensing principle. The corresponding principles and structures are introduced and discussed respectively. We focus on the research progress and key performance of hollow core microstructured optical fiber based gas sensors reported in the past 10 years to compare and discuss their advantages and disadvantages, as well as their future development prospects.