Design of interference system for portable Fourier transform infrared gas analyzer

In this paper, a novel interference system for portable Fourier transform infrared gas analyzer was developed. Compared to the traditional Michelson interferometer, 4 times optical path difference can be obtained at a small swing angle by swinging a structure with double cube corner mirrors of the system. Simultaneously, the portability and vibration resistance of the system are also enhanced. A compact Fourier gas analyzer with the inversion infrared spectrum range of 1110 ~ 5000 cm−1 was realized with the interference system. Validated by measuring the concentrations of different gradients, the results showed that the error of inversion concentration is less than 1%, which indicates the interference system has potential to be embedded in portable Fourier infrared gas analyzer for on-line comparison and supervision.