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Fast Response Microstructured Optical Fiber Methane Sensor With Multiple Side-Openings

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4 Author(s)
Hoo, Y.L. ; Dept. of Electr. Eng., Hong Kong Polytech. Univ., Kowloon, China ; Shujing Liu ; Hoi Lut Ho ; Wei Jin

We have demonstrated a fast response optical fiber methane sensor by use of a hollow-core photonic bandgap fiber with periodic microchannels fabricated by a femtosecond Ti:sapphire laser. A diffusion limited response time of ~3 s and a sensitivity of ~647 ppm have been achieved for a 7-cm sensing fiber with seven side-holes separated by 1 cm along the fiber. The side holes introduce very little loss and hence it would be practically possible to construct fiber gas sensors with long sensing length (up to a few tens of meters) to achieve highly sensitive distributed sensing without compromising the response time.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 5 )