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Simple Signal Processing Method to Enlarge the Dynamic Range of the Fresnel Reflection-Based Fiber Fabry–Perot Refractive Index Sensors
Journal of Lightwave Technology ( IF 4.7 ) Pub Date : 2020-11-19 , DOI: 10.1109/jlt.2020.3039419
Carmen E. Dominguez-Flores , Osvaldo Rodriguez-Quiroz , David Monzon-Hernandez

In this work, we propose a signal processing algorithm to enlarge the refractive index dynamic range (RIDR) of the Fresnel reflection-based fiber Fabry–Perot (FR-FFP) sensors. In this approach, the reflected spectrum of the FR-FFP interferometer is modulated by an impulse function. The processed optical spectrum includes the superposition of the original wavelength-modulated interference pattern and an ultra-narrow peak, produced by the impulse function. The wavelength of that peak coincides with a maximum of the interference fringe. In Fourier domain, the spectrum exhibits the characteristic interference peaks superimposed to a broad step. In Fourier domain the amplitude of one of the interference peaks is modulated by refractive index (RI) of the external medium, but the amplitude of the step is not affected. It was possible to stablish a simple correspondence between the amplitude of the interference peak and the RI of the external medium in a wide dynamic range [1.000, 2.000]. The inclusion of the impulse function, which produces the step in the Fourier domain, eliminates the RI ambiguity of the FR-FFP allowing the enlargement of the RIDR.

中文翻译:

简单的信号处理方法可扩大基于菲涅耳反射的法布里-珀罗折射率传感器的动态范围

在这项工作中,我们提出了一种信号处理算法,以扩大基于菲涅耳反射的法布里-珀罗光纤(FR-FFP)传感器的折射率动态范围(RIDR)。在这种方法中,FR-FFP干涉仪的反射光谱通过脉冲函数进行调制。处理后的光谱包括原始的波长调制干涉图和由脉冲函数产生的超窄峰的叠加。该峰值的波长与干涉条纹的最大值一致。在傅立叶域中,频谱显示出特征干扰峰,该峰叠加到宽阶上。在傅立叶域中,干扰峰之一的幅度由外部介质的折射率(RI)调制,但阶跃的幅度不受影响。在宽动态范围[1.000,2.000]中,可以在干扰峰的幅度和外部介质的RI之间建立简单的对应关系。脉冲函数的加入会在傅立叶域中产生阶跃,从而消除了FR-FFP的RI模糊性,从而扩大了RIDR。
更新日期:2020-11-19
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