基于游标效应的并联法布里-珀罗干涉仪传感特性的分析
Analysis of Sensing Characteristics of Parallel Fabry-Perot Interferometer Based on Vernier Effect
查看参考文献28篇
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文摘
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针对应用高阶谐波游标效应时出现的内包络消失、外包络可见度低等问题,从理论分析和实验探索两方面出发,得出了降低传感腔和参考腔的光强差异可以提高光谱质量的结论。此外,通过合理设计优化传感腔与参考腔的腔长、折射率等影响游标放大倍数的参数,在实验上采用平行结构的法布里-珀罗干涉仪制成了一阶谐波游标效应的光纤气压传感器,不仅获得了高对比度的游标干涉光谱,还在10~190 kPa气压范围内,实现了152 pm/kPa的气压灵敏度,线性度高达99%,对应的放大倍数可达到35.3。 |
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其他语种文摘
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Objective Optical fiber sensor technology has been extensively applied in gas pressure sensing in the field of industrial and environmental safety monitoring on account of its high sensitivity, compact structure, and immunity to electromagnetic interference. Compared with long-period fiber gratings and anti-resonance waveguides, optical fiber sensors based on the vernier effect generally have greater advantages in terms of sensitivity. The vernier effect is an effective method for amplifying interferometer sensitivity, which is well-known in optical fiber sensing. However, as the harmonic order j increases, vernier spectra deteriorate, namely that the contrast of the external envelope decreases, and the inner envelope disappears. The objective of this work is to generalize the higher-order vernier effect and obtain high sensitivity through experimental exploration and theoretical analysis. In addition, we intend to explore the reasons for the decrease in external envelope contrast and the loss of internal envelopes that affect spectral contrast. We expect to contribute to the extensive application of the high-order harmonic vernier effect and high-sensitivity sensor design. Methods Firstly, we theoretically simulate the higher-order vernier spectrum for j=1, 2, 3, 4. Then, we fabricate four parallel structures of the Fabry-Perot interferometers experimentally and study the corresponding vernier spectra. After that, we investigate the effect of the difference in light intensity between the sensing cavity and the reference cavity on the vernier spectrum by changing the light intensity difference between the two cavities. In addition, we analyze various parameters that affect the vernier magnification factor and design a highly sensitive fiber-based gas pressure sensor. Results and Discussions On the basis of a parallel Fabry-Perot interferometer, this paper compares the theoretical simulations (Fig. 2) and the experimental results (Fig. 3) of vernier spectra for j=1, 2, 3, 4. The comparison shows that they are consistent, which indicates the vernier effect is valid in the experiment. After that, we simulate the spectra corresponding to different light intensities of the sensing cavity and the reference cavity. It is found that with the increase in the light intensity difference between the two cavities, the contrast of the external envelope decreases, and the internal envelope disappears (Fig. 5). Then, we fundamentally explain the deterioration of the vernier spectrum when the higherorder harmonic vernier effect is applied in the experiment (Fig. 6). In addition, the factors affecting the vernier magnification are discussed from the aspects of a higher value of j and a lower detuning ratio. After that, we put forward reasonable suggestions for obtaining higher magnification when applying the vernier effect in gas pressure sensing. Furthermore, a sample corresponding to the first-order harmonic vernier effect is produced for the gas pressure test. At room temperature, it enjoys gas pressure sensitivity of 152 pm/kPa, a corresponding magnification factor of 35.3, and linearity of 99% in the range of 10-190 kPa (Fig. 4). Conclusions This paper studies the higher-order harmonic vernier effect and proposes a method to improve the interference fringe contrast for the external vernier envelope, which is verified by experiments. The reason for the reduction in the vernier spectrum contrast is the reduction in the imbalance of light intensity between the sensing and the reference cavities. The application demonstrates that with the increase in the light intensity difference between the two cavities, the vernier spectrum becomes more susceptible to the quality or noise of the light source. This leads to weaker visibility of the envelope for higher harmonic orders. |
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来源
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光学学报
,2023,43(5):0506002 【核心库】
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DOI
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10.3788/AOS221550
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关键词
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光纤光学
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光纤传感
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气压传感
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光学游标效应
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游标光谱
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地址
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1.
武汉工程大学, 光学信息与模式识别湖北省重点实验室, 湖北, 武汉, 430205
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中国科学院西安光学精密机械研究所, 瞬态光学与光子技术国家重点实验室, 陕西, 西安, 710119
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2239 |
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学科
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化学工业 |
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基金
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瞬态光学与光子技术国家重点实验室开放研究基金
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武汉工程大学科学基金
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文献收藏号
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CSCD:7448299
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