Li Yi, Wang Xiaozhen, Bao Xiaoyi
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa K1N 6N5, Ontario, Canada.
Appl Opt. 2011 May 1;50(13):1873-8. doi: 10.1364/AO.50.001873.
Optical fiber sensors are a good alternative to piezoelectric devices in electromagnetic sensitive environments. In this study, we reported a fiber acoustic sensor based on single-mode fiber (SMF) tapers. The fiber taper is used as the sensing arm in a Mach-Zehnder interferometer. Benefiting from their micrometer dimensions, fiber tapers have shown higher sensitivities to the acoustic vibrations than SMFs. Under the same conditions, the thinnest fiber taper in this report, with a diameter of 1.7 µm, shows a 20 dB improvement in the signal to noise ratio as compared to that of an SMF. This acoustic vibration sensor can detect the acoustic waves over the frequencies of 30 Hz-40 kHz, which is limited by the acoustic wave generator in experiments. We also discussed the phase changes of fiber tapers with different diameters under acoustic vibrations.
在电磁敏感环境中，光纤传感器是压电器件的良好替代品。在本研究中，我们报道了一种基于单模光纤（SMF）锥的光纤声学传感器。光纤锥用作马赫-曾德尔干涉仪中的传感臂。得益于其微米级尺寸，光纤锥对声振动的灵敏度高于单模光纤。在相同条件下，本报告中最细的光纤锥，直径为1.7 µm，与单模光纤相比，信噪比提高了20 dB。这种声振动传感器可以检测30 Hz - 40 kHz频率范围内的声波，这在实验中受到声波发生器的限制。我们还讨论了不同直径的光纤锥在声振动下的相位变化。
