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Optical Acceleration Measurement Method with Large Non-ambiguity Range and High Resolution via Synthetic Wavelength and Single Wavelength Superheterodyne Interferometry

State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
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Sensors 2018, 18(10), 3417; https://doi.org/10.3390/s18103417
Received: 6 September 2018 / Revised: 8 October 2018 / Accepted: 10 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue Laser Sensors for Displacement, Distance and Position)
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Abstract

Interferometric optomechanical accelerometers provide superior resolution, but the application is limited due to the non-ambiguity range that is always less than half of the wavelength, which corresponds to the order of mg. This paper proposes a novel acceleration measurement method based on synthetic wavelength and single wavelength superheterodyne interferometry to address this issue. Two acousto-optical modulators and several polarizers are introduced to the two-wavelength interferometry to create four beams with different frequencies and polarization states, and two ultra-narrow bandwidth filters are used to realize the single wavelength measurement simultaneously. This technique offers the possibility to expand the non-ambiguity range without compromising the high resolution. Also, the superheterodyne phase measurement and the corresponding processing algorithm are given to enable real-time measurement. A prototype is built and the preliminary experimental results are compared with the simulation results, showing good agreement. The results prove an estimated acceleration measurement resolution of around 10 μg and a non-ambiguity range of larger than 200 mg, which is more than 100 times that of the single wavelength-based optical accelerometer. View Full-Text
Keywords: acceleration measurement; synthetic wavelength; superheterodyne; large non-ambiguity range; high resolution acceleration measurement; synthetic wavelength; superheterodyne; large non-ambiguity range; high resolution
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Lu, Q.; Pan, D.; Bai, J.; Wang, K. Optical Acceleration Measurement Method with Large Non-ambiguity Range and High Resolution via Synthetic Wavelength and Single Wavelength Superheterodyne Interferometry. Sensors 2018, 18, 3417.

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