Liquid-level sensor based on chirped-fiber Bragg gratings
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摘要: 设计了一种基于啁啾光纤布喇格光栅的新型液位传感器，该传感器主要由矩形悬臂梁构成的传感机构和光纤光谱仪组成。导出了啁啾光纤布喇格光栅的反射谱带宽与液位的关系；通过光谱仪检测啁啾光纤布拉格光栅反射谱的带宽，就可以得到被测液位的高度。并对设计的传感器系统进行了实验验证，实验结果表明，该啁啾光纤布拉格光栅反射谱带宽对温度变化不敏感，且在测量范围内，反射谱带宽与被测液位间有很好的线性关系。Abstract: A novel liquid-level sensor based on a chirped-fiber Bragg grating (CFBG) is proposed，It is mainly constituted of a rectangular cantilever beam sensing mechanism and a fiber optic spectrometer. The expression of relationship between the liquid-level and the bandwidth of the reflection spectra of CFBG is derived. The liquid-level can be obtained by measuring the bandwidth of the reflection spectral of CFBG. The experimental results show that the reflection spectrum bandwidth of a CFBG is insensitive to temperature changes within the measuring range, and a good linear relationship of the bandwidth of the reflection spectrum with the measured liquid-level is obtained.
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