Laser interference signal acquisition for Fourier transform spectrometer

The laser interference signal provides effective control signal for the reliable operation of atmospheric sounder. Main components of interferometer are presented by analyzing the principle of swinging interferometer in this paper. In order to acquire the laser interference signal, it is necessary to design a method of signal acquisition for the interferometer with analyzing the noise performance of the preamplifier. By means of an interference experiment of He–Ne laser, the sinusoidal signal is obtained, the frequency of which varies with change of angular velocity of moving mirrors. The experimental results indicate that the principle of swing interferometer is feasible, and that the method of interference signal acquisition is correct.