Abstract
A Sagnac polarized standing wave interferometer (SPSWI) is extensively developed. It exploits two polarized standing wave signals formed in two orthogonal planes of oscillation to measure the displacement. However, two equal amplitude signals, which are complicated control, are sensitively required for displacement data analysis. Thus, the simple calibration process is necessary to accomplish this situation. In this paper, we present a methodology for calibrating signals from SPSWI by using Python programming to remove the constant signals, normalize oscillating signals and eliminate non-orthogonal error based on technique proposed by Fan. The relative displacement is derived from these calibrated signals.
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