期刊
IEEE SENSORS JOURNAL
卷 12, 期 9, 页码 2875-2880出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2012.2204247
关键词
Fast Fourier transform; fs laser fabrication; intrinsic Fabry-Perot interferometric (IFPI); quasi-distributed sensors; wavelength tracking
资金
- State Key Program of the National Natural Science Foundation of China [60937003, 61107076]
- Research Fund for the Doctoral Program of Higher Education, Ministry of Education of China [20093108120017]
- Innovation Program of Shanghai Municipal Education Commission [10YZ12]
- Shanghai Leading Academic Discipline Project [S30108]
In this paper, we fabricated a quasi-distributed intrinsic Fabry-Perot interferometric (IFPI) sensing array with the femtosecond laser. Each IFPI sensor is constituted by a pair of laser-induced internal reflectors and has a different cavity length. After multiplexing, IFPI sensors can be distinguished in the frequency domain for their different free spectral ranges. Next, a fast-Fourier-transform-based wavelength tracking method was proposed to demodulate the sensing signal. With a specially designed digital filter, frequency components corresponding to each sensor are extracted from the transmission spectra and are transformed back to the wavelength domain. Then the wavelength tracking method is utilized to demodulate the temperature information applied on the individual sensors. Experimental results show that the multiplexed sensors have good consistency and the temperature sensitivity is 11.24 pm/degrees C.
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