Interferogram region spreading technology in spatial domain

摘要

The kernel of modern interferometry is to obtain necessary surface shape and parameter by processing interferogram with a reasonable algorithm. The circular interferogram must be spread into square region when the interferogram is dealt with by using 2-D FFT arithmetic, which is only applied to numeric discrete data and requires square distributing region. On the basis of the study of the basic principle of interferometry by using 2-D FFT arithmetic, the principle and the method of interferogram region spreading are proposed. This technique has been used in region spreading of an actual interferogram with a satisfactory result. The results indicate that the method, with high processing precision, has established the foundation for phase recovery.