Journal
SENSORS
Volume 22, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/s22134771
Keywords
frequency-sweeping interferometry; dynamic distance measurement; Doppler-induced error compensation
Funding
- National Natural Science Foundation of China [52175530, 51975077, 51675068, 61875023]
- General projects of Chongqing Natural Science Foundation [cstc2020jcyj-msxmX0948, cstc2019jcyj-msxmX0036]
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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.
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.
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