差压传感器的条纹调幅方法

S. Kinugasa
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引用次数: 0

摘要

本文提出了一种新型的光纤干涉法和光谱调幅法相结合的压差传感器。传感系统由两个带可动压膜和反射膜的法布里-珀罗(FP)干涉腔组成。宽频光从两个FP型传感器探头返回,并在光频域中叠加。双气隙尺寸远小于与光谱分辨率成反比的相干长度,而两光纤通道之间的光程差(OPD)设计远大于相干长度。由于气隙大小的差异,叠加的干涉条纹显示出正弦和调幅信号,该信号在频域中由总气隙大小引起的信号偏置。将低频因子的频率区间转换为DP值,而不补偿源功率波动和光纤弯曲损耗等不需要的因子。实验结果表明,每太赫兹分辨率高达0.08 kPa,每满量程精度高达1.0%。
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Fringe Amplitude Modulation Method for Differential Pressure Sensor
This paper presents a new type of differential pressure (DP) sensor, which combines fiber interferometry and spectral amplitude-modulation (AM) method. The sensing system consists of two Fabry-Perot (FP) interferometric cavities with pressure movable and reflective diaphragms. The broadband lights return from the two FP type of sensor probes, and they are superimposed in the optical frequency domain. The doubled air gap size is much smaller than the coherence length inversely proportional to the spectral resolution, while the optical path difference (OPD) between two fiber channels is designed much longer than the coherence length. The superimposed intereference fringe shows a sinusoidal and amplitude modulated signal due to the air gap sizes' difference, which is biased by the signals due to the total air gap sizes in the frequency domain. Frequency interval of the low frequency factor is converted into the DP values without any compensation for the unwanted factors, including source power fluctuation and fiber bending losses. Experimental result shows that a resolution is as high as the 0.08 kPa per THz and accuracy as high as 1.0% per full scale.
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