Spectral demodulation method for high fineness F-P sensors

IF 1.1 4区 工程技术 Q4 OPTICS
Bin Liu, Hanqing Song, Yan Wang, Lei Liu, Mingguang Shan, Zhi Zhong, Lei Yu
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引用次数: 0

Abstract

We propose a white-light interferometric demodulation algorithm for high-finesse fiber-optic F-P sensors, in order to improve the demodulation accuracy and the dynamic range encountered in traditional demodulation techniques. The interferometric spectral signal of the high-finesse F-P cavity was converted to the frequency domain and then a more accurate cavity length was estimated based on full phase on higher-order components. A detailed theoretical analysis was operated. A high-finesse F-P temperature sensor based on a silicon diaphragm was fabricated and tested to verify the proposed method. The demodulation accuracy increases with the increase of order, and the anti-noise performance is improved. For the third-order component, the optical path difference sensitivity obtained by this algorithm is 0.231 ± 0.0188 μm / ° C, and the average error rate of cavity length demodulation value is 0.0152%. The proposed algorithm is applicable to demodulate the high-finesse F-P cavities in the light source bandwidth of 1525 to 1575 nm, providing high accuracy and improved anti-noise performance.
高精细度F-P传感器的光谱解调方法
为了提高传统解调技术的解调精度和动态范围,提出了一种高精细度光纤F-P传感器的白光干涉解调算法。将高精细度F-P腔干涉光谱信号转换到频域,基于高阶分量的全相位估计出更精确的腔长。进行了详细的理论分析。制作了一种基于硅膜片的高精密F-P温度传感器,并对该方法进行了测试。解调精度随阶数的增加而提高,抗噪声性能得到改善。对于三阶分量,该算法获得的光路差分灵敏度为0.231±0.0188 μm /°C,腔长解调值的平均误差率为0.0152%。该算法适用于光源带宽为1525 ~ 1575 nm的高精细度F-P空腔的解调,具有较高的解调精度和较好的抗噪性能。
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来源期刊
Optical Engineering
Optical Engineering 工程技术-光学
CiteScore
2.70
自引率
7.70%
发文量
393
审稿时长
2.6 months
期刊介绍: Optical Engineering publishes peer-reviewed papers reporting on research and development in optical science and engineering and the practical applications of known optical science, engineering, and technology.
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