In-fiber quasi-Michelson interferometer for liquid level measurement with a core-cladding-modes fiber end-face mirror

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• 作者：Qiangzhou Rong ; Xueguang Qiao ; Yanying Du ; Hao Sun ; Dingyi Feng ; Ruohui Wang ; Manli Hu ; Zhongyao Feng
• 关键词：Optical fibers ; Quasi-Michelson interferometer ; Liquid level measurement
• 刊名：Optics and Lasers in Engineering
• 出版年：June, 2014
• 年：2014
• 卷：57
• 期：Complete
• 页码：53-57
• 全文大小：1309 K

文摘

An in-fiber quasi-Michelson interferometer (IFQMI) working on reflection is proposed and experimentally demonstrated for liquid level measurement. The device consists of a short piece of small-core fiber (SCF) followed by a standard single-mode fiber (SMF) where its end-face is terminated by a thick silver film. A well-defined interference pattern is obtained as the result of the fiber-core mismatch and core-cladding modes interference. The proposed device with a 30 mm pigtail SMF at a wavelength of 1555 nm presents a water level sensitivity of 鈭?8.3 pm/mm. Besides, the proposed device can also discriminate the refractive index (RI) of liquid measured. The IFQMI with 50 mm-long SMF provides a high RI sensitivity of 鈭?200.61 (pm/mm)/RIU.