Method for Subtracting Phase Errors in an Interferometer

Polhemus, C.; Chocol, C. J.

doi:10.1364/ao.10.000441

Cited by 9 publications

(1 citation statement)

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“…In order to solve this problem, laser interference absolute distance measurement technology has been studied by more and more scholars. In the 1970s, J. C. Wyant and C. Polhemus in the United States carried out dual wavelength interference experiments [6][7][8], and proposed that multiple wavelengths be combined to form synthetic wavelength chains with different lengths. At the same time, the measured distance is refined step by step from different synthetic wavelengths, which has become the basic theory of multi wavelength ranging.…”

Section: Introductionmentioning

confidence: 99%

Research on Dual-Wavelength Absolute Ranging Technology Based on FMCW Laser Interference

Sun

Song

2021

Preprint

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FMCW (Frequency-Modulated Continuous Wave) interferometer can achieve high-precision displacement measurement by phase discrimination of the interference signal. The phase needs to be superimposed continuously, so the optical path cannot be interrupted in the measurement process. To solve this problem, a new absolute ranging technology - decimal comparison method is proposed in the manuscript. According to the principle of FMCW interference, two DFB lasers with different central wavelengths are used to measure the same target. The sampled interference signal is processed by digital signal processing to calculate the integer and decimal of the synthetic wavelength period. The optical path difference of the target is calculated by the established mathematical model. The experimental results show that this method not only ensures the measurement accuracy, but also realizes the absolute measurement, and expands the application range of FMCW interferometry.

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Section: Introductionmentioning

confidence: 99%