基于变采样长度傅里叶变换的白光干涉仪解调  

Demodulation of White-Light Interferometry Based on Variable Sampling Length Fourier Transform

作　　者：谢杰辉 王付印[1] 胡正良[1] 胡永明[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《光学学报》2014年第13期90-93,共4页Acta Optica Sinica

摘　　要：基于傅里叶变换的非本征光纤法布里-珀罗干涉仪（EFPI）的解调方法，对解调白光干涉的EFPI具有解调精度高，动态范围大，且可实现腔长的绝对测量等优点。然而，该方法的动态范围和解调精度分别受限于采样导致的非线性谱分布以及傅里叶变换的栅栏效应。分别采用三次样条插值和改进的傅里叶变换来消除光谱的啁啾特性和提高解调精度。仿真和实验证明该算法的解凋精度提高了70倍。The Fourier transform （FT） method for demodulating the extrinsic Fabry-Perot interferometer （EFPI） possesses the advantage of high resolution and wide dynamic range for the absolute measurement in demodulating white-light EFPI. However, the dynamic range and the resolution of this method are limited by the nonlinear relationship with the scanning wavelength and the fence effect of FT, respectively. The cubic spline interpolation and a modified FT algorithm are used to reduce the influence of chirped spectrum and increase the resolution, respectively. The simulation and the experimental results show that the algorithm has seventy times enhancement of the resolution of demodulation.

关 键 词：传感器 高精度 新型算法 非本征光纤法布里-珀罗干涉仪 

分 类 号：TN253[电子电信—物理电子学]