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The Fourier transform spectrometer (FTS) is a core instrument for solarobservation with high spectral resolution, especially in the infrared. TheInfrared System for the Accurate Measurement of Solar Magnetic Field (AIMS),working at 10-13 $\mu m$, will use a FTS to observe the solar spectrum. TheBruker IFS-125HR, which meets the spectral resolution requirement of AIMS butjust equips with a point source detector, is employed to carry out preliminaryexperiment for AIMS. A sun-light feeding experimental system is furtherdeveloped. Several experiments are taken with them during 2018 and 2019 toobserve the solar spectrum in the visible and near infrared wavelength,respectively. We also proposed an inversion method to retrieve the solarspectrum from the observed interferogram and compared it with the standardsolar spectrum atlas. Although there is a wavelength limitation due to thepresent sun-light feeding system, the results in the wavelength band from0.45-1.0 $\mu m$ and 1.0-2.2 $\mu m$ show a good consistence with the solarspectrum atlas, indicating the validity of our observing configuration, thedata analysis method and the potential to work in longer wavelength. The workprovided valuable experience for the AIMS not only for the operation of a FTSbut also for the development of its scientific data processing software.

Solar observation with the Fourier transform spectrometer I : Preliminary results of the visible and near-infrared solar spectrum