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从双光束干涉的基本原理出发,分析了高斯分布光源条件下利用傅里叶变换解调光纤法布里珀罗传感器的原理。针对高斯分布光源特点,提出直接对波长均匀采样得到的光谱数据进行快速傅里叶变换,然后利用传感器腔长与频域中峰值频率之间的关系求解传感器腔长的可行性。在此基础上,采用频谱插值技术提高了系统解调精度,并利用宽带光源和光谱仪等组成的解调系统,对所提出的方法进行了实验验证。结果表明,从实验中测得的数据与理论计算值能较好地吻合。
Based on the principle of double beam interference, the principle of demodulating fiber Fabry - Perot sensor by Fourier transform is analyzed under Gaussian distributed light source. Aiming at the characteristics of Gaussian distributed light source, a fast Fourier transform is proposed to directly analyze the spectral data obtained by uniform wavelength sampling. Then, the feasibility of using the relationship between the sensor cavity length and the peak frequency in the frequency domain to solve the sensor cavity length is proposed. On this basis, the spectral interpolation technique is used to improve the system demodulation accuracy. The proposed method is validated by the demodulation system composed of broadband light source and spectrometer. The results show that the data measured from the experiment can be well fitted with the theoretical values.