Testing device and method for obtaining optimal optical path of infrared spectroscopy

The invention discloses a test device and method for obtaining an optimal optical path of an infrared spectroscopy, belongs to the technical field of spectrum detection, and solves the problems of high test cost and low efficiency in the prior art. According to the technical scheme, the testing device comprises a body, a piston arranged in the body, a light-transmitting piece arranged on the piston, an infrared pulse light source arranged at the first end of the body, a mirror surface arranged at the second end of the body, a reference channel light filter, a measuring channel light filter and a double-channel infrared receiver. A vacuumizing assembly is arranged on the side, close to the mirror face, of the body, and an air inlet and an air outlet are formed in the side, close to the infrared pulse light source, the piston is connected with a driving mechanism, the driving mechanism comprises a motor and a transmission assembly, the motor is controlled by a single-chip microcomputer, the transmission assembl