Abstract
In order to detect weak signals of high frequency with fiber Bragg gratings (FBG), the FBG demodulation system based on matched filter is established. First, the output expression and maximum wavelength sensitivity as well as the main way to improve its demodulation property were analyzed in detail. On these bases, the FBG-matched filter demodulation device was set up to measure the vibration signals of an ultrasonic cleaning tank. A SLED broadband light source was used to provide light energy; an amplified InGaAs photo detector was used to measure the optical power; a digital oscilloscope was employed to display and record the output signals. The experiment results showed that ultrasonic signal with main frequency of 43.945 kHz and strain range of about 55με has been achieved.
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Acknowledgment
This paper is funded and supported by the New Doctoral Research Projects of Jianghan University No. 1006-06550001.
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Meng, L., Zhu, F. (2016). Experimental Research on Fiber Bragg Gratings High-Speed Wavelength Demodulation Method. In: Qin, Y., Jia, L., Feng, J., An, M., Diao, L. (eds) Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation. Lecture Notes in Electrical Engineering, vol 378. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-49370-0_23
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DOI: https://doi.org/10.1007/978-3-662-49370-0_23
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