Research on Distance Measurement System Based on Swept-Source Interferometry

DOI: https://doi.org/10.62517/jes.202502426

Author(s)

Ruiping Wang*, Jiajia Dong, Xiaomei He, Lei He

Affiliation(s)

Changcheng Institute of Metrology and Measurement (CIMM), Beijing, China *Corresponding Author

Abstract

This paper presents the design and implementation of an absolute distance measurement system grounded in the principles of swept-frequency interferometry. The system utilizes a swept-frequency light source with a central wavelength of 1310 nm and a scanning range of 100 nm, integrated with a Mach-Zehnder fiber interferometer and a balanced photodetector to facilitate high-speed acquisition and processing of interference signals. Spectral calibration is achieved via a k-clock-assisted interferometer, enabling preprocessing of the raw signals through equal wavenumber resampling, DC component removal, and Hanning window shaping, effectively suppressing noise and enhancing signal fidelity. Subsequent Fourier transform transposes the interference data from the wavenumber domain to the depth domain, from which peak extraction is performed to resolve absolute distance measurements.

Keywords

Swept-Frequency Interferometry; Distance Measurement; Spectral Calibration; Fourier Transform

References

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