Simultaneous measurement of refractive index and temperature based on a core-offset Mach-Zehnder interferometer combined with a fiber Bragg grating

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• 作者：Qiqi YaoAuthor Vitae ; Hongyun Meng ; ^{hymeng@scnu.edu.cn" class="auth_mail}Author Vitae ; Wei WangAuthor Vitae ; Hongchao XueAuthor Vitae ; Rui XiongAuthor Vitae ; Ben HuangAuthor Vitae ; Chunhua TanAuthor Vitae ; Xuguang HuangAuthor Vitae
• 关键词：Fiber sensor ; Refractive index (RI) ; Core-offset Mach&ndash ; Zehnder interferometer (MZI) ; Fiber Bragg grating (FBG)
• 刊名：Sensors and Actuators A: Physical
• 出版年：1 March, 2014
• 年：2014
• 卷：209
• 期：Complete
• 页码：73-77
• 全文大小：1099 K

文摘

An all-fiber sensor for simultaneous measurement of refractive index and temperature in solutions is proposed and demonstrated. The sensing head contains a core-offset Mach-Zehnder interferometer (MZI) and a fiber Bragg grating (FBG). The interference fringe of the MZI and the Bragg wavelength of the FBG would shift with the variation of the ambient refractive index (RI) and/or temperature. The experimental results show that the RI sensitivity and the temperature sensitivity for the sensor are 13.7592 nm/RI and 0.0462 nm/掳C, respectively. Its low fabrication cost, simple configuration and high sensitivity will have attractive potential applications in chemical and biological sensing.