克服准直性误差对傅里叶变换光谱仪光谱性能的影响是研制傅里叶变换光谱仪的难点,定镜动态校准技术是解决该问题的好方法,而准直性误差检测是实现动态校准技术的关键。介绍了一种基于相位检测的傅里叶变换光谱仪准直性误差检测装置,该装置采用相位检测法实时检测动镜倾斜角,并用 FPGA 实现了相位检测算法,具有实时性好、测量精度高的优点,为实现动态校准系统打下了基础.给出了实测的动镜动态倾角曲线. Overcoming the influence of collimation error on the spectral performance of Fourier transform spectrometer is difficult to develop Fourier transform spectrometer. The dynamic calibration technology of fixed mirror is a good way to solve the problem. The collimation error detection is to realize the dynamic calibration technology The essential. A phase error detection device for Fourier transform spectrometer based on phase detection is introduced. The phase detection method is used to detect the tilt angle of the moving mirror in real time. The phase detection algorithm is realized by FPGA. It has the advantages of good real - time and high measurement accuracy The advantages of this method have laid the foundation for the realization of dynamic calibration system, and the dynamic inclination curve of the moving mirror has been given.