Improved signal processing method for heterodyne inter.ferometer

Improved signal processing method for heterodyne inter.ferometerZhao Hongzhi, Zhao YangDept. of Precision Instruments, Tsinghua UniversityBeijing 100084, P. R. ChinaABSTRACTOn the basis of the combination of phase measurement and integer periodic phase measurement, a signal processingscheme, which is used for optical heterodyne interferometer with large range, is described. It not only maintains the