Room Temperature Study on Rare Earth Doped Multiferroics for Fiber Optic Gas Sensing Applications

Abstract

To ensure overall safety, industrialization and the subsequent degradation of the environment over the last few decades necessitate immediate modification of industrial processes as well as the rapid implementation of effective environmental monitoring and control strategies. As a result, environmental monitoring sensors have risen to the top of the priority list for monitoring industrial effectiveness in both temporal and spatial domains. The fiber optic gas sensor (FOGS) using clad modification methodology provides a very appealing platform for use in biomedicine, acoustics, environmental monitoring, structural health monitoring, and a variety of industrial applications owing to its remarkable properties such as EMI immunity, miniaturized structure, ability to operate in high temperature, biocompatibility, and remote sensing ability. The standard FOGS sensing concept is to coat a sensing element over the etched cladding on the optical fiber surface, then allow the analyte to communicate with the coated sensing element at room temperature, causing changes in the optical properties of the sensing material, such as absorbance and thus the refractive index, resulting in a change in the output optical signal. Ternary metal oxides (e.g., spinels, ferrites and perovskites) are being explored for modification of the clad in the fiber optic sensors newline