Schedule 4 10:20 AM - 10:40 AM [OPTM-3-04] Design of FPGA-based signal-processing system based on the direct phase determination method for heterodyne interferometry *Dong Thanh Nguyen1, Anh Duong Quang1, Masato Higuchi1, Dong Wei1, Masato Aketagawa1 (1. Nagaoka University of Technology)