Observations in tera-hertz astronomy can only be done at a site with good atmospheric transmission at millimeter and
submillimeter wavelengths. With extremely dry weather and calm atmosphere resulted by high altitude and cold
temperature, Dome A (or Dome Argus), Antarctica, is possibly the best site on this earth for THz astronomy. To evaluate
the site condition there, we are constructing a Fourier Transform Spectrometer (FTS) based on Martin-Puplett
interferometer to measure the atmospheric transmission in the frequency range of 0.75~15THz. The whole FTS system is
designed for unattended and outdoor (temperatures even below -70 degrees Celsius) operation. Its total power
consumption is estimated to be approximately 200W. This contribution will give a brief overview of this FTS
development.
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