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Open AccessArticle

A Traceable High-Accuracy Velocity Measurement by Electro-Optic Dual-Comb Interferometry

1
School of Marine Science and Technology, TianJin University, TianJin 300072, China
2
Beijing Institute of Aerospace Control Devices, Beijing 100854, China
3
Department of Electrical and Computer Engineering, UC Santa Barbara, CA 93106, USA
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(19), 4118; https://doi.org/10.3390/app9194118
Received: 20 August 2019 / Revised: 4 September 2019 / Accepted: 19 September 2019 / Published: 2 October 2019
An electro-optic dual-comb Doppler velocimeter for high-accuracy velocity measurement is presented in this paper. The velocity information of the object can be accurately extracted from the change of repetition frequency, which is in the microwave frequency domain and can be locked to an atomic clock. We generate two optical combs by electro-optic phase modulators and trace their repetition frequencies to the rubidium clock. One functions as the measurement laser and the other the reference. Experimentally, we verify its high accuracy in the range of 100–300 mm/s with a maximum deviation of 0.44 mm/s. The proposed velocimeter combines the merits of high accuracy and wide range. In addition, since the repetition frequency used for the measurement is traceable to the rubidium clock, its potential superiority in traceability can be utilized in velocity metrology. View Full-Text
Keywords: electro-optic dual-comb interferometry; laser Doppler velocimetry; Traceability electro-optic dual-comb interferometry; laser Doppler velocimetry; Traceability
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MDPI and ACS Style

Xue, B.; Zhang, H.; Zhao, T.; Jing, H. A Traceable High-Accuracy Velocity Measurement by Electro-Optic Dual-Comb Interferometry. Appl. Sci. 2019, 9, 4118.

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