Mr. Hua Kang Profile

Hua Kang

at Beijing Univ of Technology

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Proceedings Article | 12 November 2010 Paper

The study of interferometer spectrometer based on DSP and linear CCD

Hua Kang, Yuexiang Peng, Xinchen Xu, Xiaoqiao Xing

Proceedings Volume 7855, 78551D (2010) https://doi.org/10.1117/12.868435

KEYWORDS: Digital signal processing, Charge-coupled devices, Spectroscopy, Polarization, Interferometers, Prisms, LCDs, Signal processing, Optical testing, Geometrical optics

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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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