Fibers for Optical Gas Sensors

To date, direct UV absorption sensing has been used mainly in environmental applications to monitor pollutants in the atmosphere such as ozone and NO (Wu et al. 2006), hydrocarbons, and volatile organic compounds (VOCs) (Lin et al. 2004). Fiber optic UV systems for gas and vapor analysis have been reviewed by Eckhardt et al. (2007). The strong absorbance of vapors and gases in the UV region is advantageous and has resulted in a compact detection system of good accuracy. 

Element Single-mode fiber (pm) Multimode fiber (pm) Material 

Heavy-metal fluoride (HMFG) Germanate Chalcogenide Polycrystalline (PC) 

Single crystal (SC) Metal/dielectric film Refractive index 1 

14 Materials for Optical, Fiber Optic, and Integrated Optical Sensors 

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