Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry

To improve the precision of dynamic distance measurement based on the frequency-swept interferometry (FSI) system, a Doppler-induced error compensation model based on a scheme increasing the frequency sweeping rate is proposed. A distance demodulation method based on a Fourier transformation is investigated when the defined quasi-stationary coefficient approaches a constant. Simulations and experiments based on dynamic distance with a sinusoidal change demonstrate that the proposed method has a standard deviation of 0.09 mu m within a distance range of 4 mu m at a sweeping rate of 60 KHz.

Automated summary

In this study, a method is proposed to improve the precision of dynamic distance measurement in a frequency-swept interferometry system by compensating for Doppler-induced errors through increasing the sweep rate. A distance demodulation method based on Fourier transformation is investigated when the defined quasi-stationary coefficient approaches a constant. Simulations and experiments show that the proposed method has a standard deviation of 0.09 μm within a distance range of 4 μm at a sweeping rate of 60 kHz.