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首页> 外文期刊>Optics Letters >Wavelength-switched phase interrogator for extrinsic Fabry-Perot interferometric sensors
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Wavelength-switched phase interrogator for extrinsic Fabry-Perot interferometric sensors

机译：用于外部法布里-珀罗干涉传感器的波长切换鉴相器

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We report on phase interrogation of extrinsic Fabry-Perot interferometric (EFPI) sensors through a wavelength-switched unit with a polarization-maintaining fiber Bragg grating (PMFBG). The measurements at two wavelengths are first achieved in one total-optical path. The reflected peaks of the PMFBG with two natural wavelengths are in mutually perpendicular polarization detection, and they are switched through an electro-optic modulator at a high switching speed of 10 kHz. An ellipse fitting differential cross multiplication (EF-DCM) algorithm is proposed for interrogating the variation of the gap length of the EFPI sensors. The phase demodulation system has been demonstrated to recover a minimum phase of 0.42 mu rad/root Hz at the test frequency of 100 Hz with a stable intensity fluctuation level of +/- 0.8 dB. Three EFPI sensors with different cavity lengths are tested at the test frequency of 200 Hz, and the results indicate that the system can achieve the demodulation of EFPI sensors with different cavity lengths stably. (C) 2016 Optical Society of America
机译：我们通过具有保偏光纤布拉格光栅（PMFBG）的波长切换单元，报告了外在法布里-珀罗干涉（EFPI）传感器的相位询问。首先在一个全光路径中实现两个波长的测量。具有两个自然波长的PMFBG的反射峰处于相互垂直的偏振检测中，并以10 kHz的高开关速度通过电光调制器进行开关。提出了一种椭圆拟合差分交叉乘法（EF-DCM）算法，用于查询EFPI传感器的间隙长度变化。经证明，该相位解调系统可在100 Hz的测试频率下恢复最小0.42μrad / root Hz的相位，并具有+/- 0.8 dB的稳定强度波动水平。在200 Hz的测试频率下测试了三种不同腔长的EFPI传感器，结果表明该系统可以稳定地实现不同腔长的EFPI传感器的解调。 （C）2016美国眼镜学会

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