In this paper, general theory of Fourier-transform spectrometer and polarization interferometer is presented. A new
design is proposed for Fourier-transform spectrometer based on polarization interferometer with Wollaston prisms and
linear CCD. Firstly, measured light is changed into linear polarization light by polarization plate. And then the light can
be split into ordinary and extraordinary lights by going through one Wollaston prism. At last, after going through another
Wollaston prism and analyzer, interfering fringes can be formed on linear CCD behind the analyzer. The linear CCD is
driven by CPLD to output amplitude of interfering fringes and synchronous signals of frames and pixels respectively.
DSP is used to collect interference pattern signals from CCD and the digital data of interfering fringes are processed by
using 2048-point-FFT. Finally, optical spectrum of measured light can be display on LCD connected to DSP with RS232.
The spectrometer will possess the features of firmness, portability and the ability of real-time analyzing. The work will
provide a convenient and significant foundation for application of more high accuracy of Fourier-transform spectrometer.
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