Abstract: The utility model discloses a terahertz time domain spectrum detection mechanism. The terahertz time domain spectrum detection mechanism comprises an arc-shaped guide rail group, two sliding blocks arranged on the arc-shaped guide rail group, and an emission arc-shaped fixing base and a reception arc-shaped fixing base which are arranged on the sliding blocks respectively. An emission probe group is fixed on the emission arc-shaped fixing base, and a reception probe group is fixed on the reception arc-shaped fixing base. A coaxial fixing rack is arranged on the arc-shaped guide rail group, a rotating fixing base is arranged on the coaxial fixing rack, and a spectroscope group and a sample group are arranged on the rotating fixing base. The beneficial effects of the utility model are that: three measurement modes can be realized simultaneously by the same one arc-shaped guide rail group, and the convenience of the whole machine measurement is improved; by an integrated guide rail substrate of the arc-shaped guide rail group, the processing precision of the coaxiality of the emission arc-shaped fixing base, the reception arc-shaped fixing base, the sliding blocks and the guide rail substrate is also conducive, the installation and debugging difficulty is reduced, and the installation and debugging precision is improved.
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