弹光调制干涉具干涉数据的获取及光谱复原

为了获得弹光调制干涉具干涉信号的频谱,需进行光谱反演,但因其相位是非线性的,直接采用快速傅里叶变换反演光谱会导致光谱严重失真,因此提出采用非均匀快速傅里叶变换算法对干涉数据进行光谱反演的方法。首先采用基于高速数据采集卡PCI-5122设计的虚拟示波器获取652.6nm激光经弹光调制干涉具的干涉数据,然后在MATLAB环境中对干涉数据进行光谱反演,得到了相应的频谱信息。结果表明,对采集的652.6nm激光波长测量误差小于1nm,谱线位置误差小于0.1%,验证了该算法在弹光调制非均匀干涉数据光谱反演的可行性,这对弹光调制高性能傅里叶变换光谱仪的设计有借鉴应用价值。

Acquisition of photoelastic modulator interferometer data and spectrum recovery

In order to obtain the frequency spectrum of a photoelastic modulator interferometer,it needs spectrum recovery.Because of the nonlinear phase,the effect of spectrum recovery is poor by using the fast Fourier transform,so the non-uniform fast Fourier transform algorithm was proposed for spectrum recovery of the interference data.Firstly,the interference data with 652.6nm laser passing through the photoelastic modulator interferometer was obtained by the virtual oscilloscope based on high-speed data acquisition card PCI-5122.Then,the spectrum interference data was recovered with Matlab software.The recovery results show that the wavelength measurement error of the collected 652.6nm laser data is less than 1nm,the recovered error is less than 0.1%,which verifies the feasibility of the algorithm for the spectrum recovery of non-uniform photoelastic modulation interference data and have reference value for the design of high-performance photoelastic modulator-Fourier transform spectrometer.