Abstract
We present an experimental study of a fiber optic hydrogen gas sensor which works on the phenomenon of surface plasmon resonance. The sensor operates in intensity modulation scheme. The fiber optic probe was fabricated by removing a small section of the fiber cladding and symmetrically depositing a thin layer of indium tin oxide (ITO) by thermal evaporation technique onto the fiber core. The presence of hydrogen in the air around the ITO changes the dielectric function of ITO. The SPR spectra were obtained for 100% nitrogen as well as for a mixture of 4% hydrogen and 96% nitrogen. A sharp dip in the transmittance spectrum was observed in the case of mixture of 4% hydrogen and 96% nitrogen. The transmittance corresponding to the resonance wavelength was found to decrease with the increase in the exposure time of the hydrogen gas to ITO. The present sensor can be used for the online monitoring of hydrogen gas in various environments.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
