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.