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首页> 外文期刊>Applied optics >Harmonic peak locations based on the twice fast Fourier transform algorithm in a Sagnac intrusion sensing system
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Harmonic peak locations based on the twice fast Fourier transform algorithm in a Sagnac intrusion sensing system

机译：Sagnac入侵感测系统中基于两次快速傅里叶变换算法的谐波峰值位置

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Null frequencies in the spectrum of a phase difference signal are used for intrusion localization since their values are associated with the position of intrusion in a Sagnac interferometer. However, searching the null frequencies individually is troublesome and unreliable for localization. In this paper, an algorithm which directly captures the interval of null frequencies is proposed to achieve a simpler and more robust intrusion localization. By applying the modified spectrum to a second fast Fourier transform, the interval responds as multiple peaks in the resulting location curve. After determining the values of the base peak and its harmonic peaks, the intrusion's distance can be localized. Intrusions are applied at a position of 130 km in a sensing fiber. Due to the resolution increase as peak order, localization performance of 2nd harmonic peak is 25 m, which is 34% better than the base peaks. By calculating the average of the localization results by all remarkable peaks, localization performance improves by 47% in laboratory experiments and by 24% in practical applications over the previous single-peak localization algorithm. (C) 2016 Optical Society of America
机译：相差信号频谱中的零频率用于入侵定位，因为它们的值与Sagnac干涉仪中的入侵位置相关。然而，单独搜索零频率是麻烦的并且对于定位是不可靠的。本文提出了一种直接捕获零频率间隔的算法，以实现更简单，更可靠的入侵定位。通过将修改后的频谱应用于第二个快速傅立叶变换，该间隔将在结果位置曲线中作为多个峰响应。在确定基本峰值及其谐波峰值的值之后，就可以确定入侵的距离。入侵在感应光纤中的130 km位置处进行。由于分辨率随着峰阶的增加而增加，因此二次谐波峰的定位性能为25 m，比基本峰好34％。通过计算所有显着峰的定位结果的平均值，与以前的单峰定位算法相比，在实验室实验中的定位性能提高了47％，在实际应用中的性能提高了24％。 （C）2016美国眼镜学会

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