Intermediate infrared spectrometer

The invention discloses an intermediate infrared spectrometer for realizing nanosecond time resolution by using pulse warming. The intermediate infrared spectrometer is used for measuring dynamic structure change of protein, and comprises a wideband tunable carbon oxide laser for emitting intermediate infrared detection laser to a to-be-detected protein solution, a nanosecond Q-modulation holmium laser for emitting pumping laser to heat the to-be-detected protein solution, a pumping detection light path system for detecting the strength of the intermediate infrared detection laser penetrating through the to-be-detected protein solution, and a data acquiring system for acquiring the strength data detected by the pumping detection light path system. The intermediate infrared spectrometer disclosed by the invention can be used for accurately measuring instant infrared spectrometry data of protein dynamic structure change and dynamics information of the protein dynamic structure change, the high-precision measurement on the protein secondary protein structure dynamic structure can be realized, and the infrared spectrometry data precision can reach 1*10 OD.