Dynamic absolute distance measurement with nanometer-precision and MHz acquisition rate using a frequency comb-based combined method

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Distance metrology is crucial in supporting modern science and technology such as satellites interconnection, autonomous driving, motion control, and precision manufacturing. A combined method, which is a simultaneous distance measurement with multiple methods, was developed and widely utilized to increase the measurable range while maintaining high precision. However, the measurement speed has been limited to a few kHz due to the requirement for combining a precision measurement with a long-range measurement. In this work, we present a new dynamic distance measurement method based on electro-optic sampling timing detection (EOS-TD) that can preserve the non-ambiguity range (NAR) extension even at >1 MHz acquisition rate. By combining the EOS-TD-based pulse time-of-flight detection method with a microwave phase detection method, 300-mm NAR and 49-nm precision are made possible at 1-mu s acquisition time. With longer averaging time, the best precision of 0.99 nm is achieved at 0.22-s acquisition time, corresponding to 169 dB maximum dynamic range. As a demonstration experiment, two mirrors that were similar to 83 mm apart and each controlled by a piezo actuator with hundreds of nanometers of displacement variations had their distance between them precisely measured.
Publisher
ELSEVIER SCI LTD
Issue Date
2023-03
Language
English
Article Type
Article
Citation

OPTICS AND LASERS IN ENGINEERING, v.162

ISSN
0143-8166
DOI
10.1016/j.optlaseng.2022.107414
URI
http://hdl.handle.net/10203/304470
Appears in Collection
ME-Journal Papers(저널논문)
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