Temporal data densification in fiber optic interferometer with triangular-wave phase modulation for dynamic displacement measurement

We developed a new data processing scheme for temporal data densification in a fiber optic interferometer with triangular-wave phase modulation for dynamic displacement measurement. The proposed method uses all the peak-point data of the interference signals in the time domain, which can enlarge the measurement bandwidth by four times compared with the previous methods. We have validated the principle of the proposed method by measuring the dynamic displacement of PZT vibrations at 80 kHz.