A phase surface plasmon resonance (SPR) sensing technology based on white light polarized interference in common-path geometry is reported. A halogen lamp is used as the excitation source of the SPR sensor. The fixed optical path difference (OPD) between p- and s-polarized light is introduced by a birefringence crystal to produce sinusoidal spectral interference fringes. The SPR phase is accurately extracted from the interference fringes using a novel iterative parameter-scanning cross-correlation algorithm. The dynamic detection range is expanded by tracking the best SPR wavelength, which is identified using a window Fourier algorithm. The experimental results show that the sensitivity of this SPR system was 1.3 × 10-7 RIU, and the dynamic detection range was 0.029 RIU. This sensor, not only simple to implement and cost efficient, requires no modulators.

中文翻译：

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基于白光偏振干扰的相位询问SPR感测，适用于宽动态检测范围。

报道了一种基于共模几何中白光偏振干涉的相表面等离子体共振（SPR）传感技术。卤素灯用作SPR传感器的激发源。p偏振光和s偏振光之间的固定光程差（OPD）由双折射晶体引入，以产生正弦频谱干涉条纹。使用新颖的迭代参数扫描互相关算法，可以从干涉条纹中准确提取SPR相位。通过跟踪最佳SPR波长来扩展动态检测范围，该最佳SPR波长使用窗口傅立叶算法进行识别。实验结果表明，该SPR系统的灵敏度为1.3×10-7 RIU，动态检测范围为0.029 RIU。这种传感器不仅易于实施且具有成本效益，