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Vol. 12, Iss.6—Jun.1, 2024 • pp: 1107-1114 Spec. pp:

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Research ArticlesVol. 12, Iss.6-Jun..1,2024

Instrumentation and Measurements

Transient long-range distance measurement by a Vernier spectral interferometry

Liang Xu, Kun Wang, Chen Liu, Wenying Chen, Chi Zhang, and Xinliang Zhang

Rapid and long-range distance measurements are essential in various industrial and scientific applications, and among them, the dual-comb ranging system attracts great attention due to its high precision. However, the temporal asynchronous sampling results in the tradeoff between frame rate and ranging precision, and the non-ambiguity range (NAR) is also limited by the comb cycle, which hinders the further advancement of the dual-comb ranging system. Given this constraint, we introduce a Vernier spectral interferometry to improve the frame rate and NAR of the ranging system. First, leveraging the dispersive time-stretch technology, the dual-comb interferometry becomes spectral interferometry. Thus, the asynchronous time step is unlimited, and the frame rate is improved to 100 kHz. Second, dual-wavelength bands are introduced to implement a Vernier spectral interferometry, whose NAR is enlarged from 1.5 m to 1.5 km. Moreover, this fast and long-range system also demonstrated high precision, with a 22.91-nm Allan deviation over 10-ms averaging time. As a result, the proposed Vernier spectral interferometry ranging system is promising for diverse applications that necessitate rapid and extensive distance measurement.

Photonics Research

Publication Date: May. 07, 2024
Vol. 12, Issue 6, 1107 (2024)

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