Abstract
A novel fiber optic surface plasmon resonance (SPR) hydrogen sensor has been developed based on hetero-core structured fiber optics with multi-layer films of gold (Au), tantalum pentaoxide (Ta2O5) and palladium (Pd) uniformly coated onto a cylindrical cladding surface. We experimentally observed that the SPR resonant wavelength is shifted 28nm with 4%-hydrogen concentration in nitrogen. In a light intensity-based experiment with an LED operating at 850nm, it has been presented that a transmitted loss change of 0.23dB was induced with a response time of 15s for 4% hydrogen in the case of 25-nm Au, 60-nm Ta2O5 and 3-nm Pd multi-layer film. The proposed sensor has successfully detected hydrogen concentrations with a high sensitivity despite the usage of very thin Pd films.
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