Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 25, Issue 8, Pages 713-716Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2013.2241421
Keywords
Fabry-Perot interferometer (FPI); laser machining; optical fiber sensors; thin films
Funding
- Project of National Science Foundation of China, NSFC [61290311]
- Program for New Century Excellent Talents in University [NCET-10-0664]
- Fundamental Research Funds for the Central Universities [2012-JL-09]
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In this letter, an optical fiber hydrogen sensor based on a Fabry-Perot interferometer cavity fabricated by femtosecond laser micromachining near the fiber end and deposited with Pd film is proposed. The relationship between the reflection spectrum and the hydrogen concentration is simulated, and experimentally demonstrated. The shifts of the interferometer output spectrum are 10, 30, 100, and 150 pm respectively, corresponding to the hydrogen concentration of 2%, 4%, 6%, and 8%, respectively. The proposed sensor is compact, easy in fabrication, and has high potential for hydrogen detection.
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