Double-wavelength superheterodyne interferometer for absolute ranging with submillimeter resolution: results obtained with a demonstration model by use of rough and reflective targets

Margheri, Giancarlo; Giunti, C.; Zatti, S.; Manhart, S.; Maurer, Roland

doi:10.1364/ao.36.006211

Cited by 11 publications

(2 citation statements)

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“…The accuracy mainly depends on the phase measurement accuracy of the single wavelength measurement. According to the previous work, the noise level of the whole system except the phase meter was around 1 mV [ 11 , 28 ], wihch is much smaller than the noise level of the AD8302 (~10 mV); therefore, we get the estimated resolution of this prototype as

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Section: Prototype Setup and Experimental Resultsmentioning

confidence: 99%

“…Inspired by these developed optical measurement techniques, we first demonstrate a real-time large NAR and high-resolution optical acceleration measurement approach that makes use of the merits of synthetic wavelength and singe wavelength interferometry along with the superheterodyne detection method [ 28 ]. This new scheme offers the possibility of acceleration measurement with a large NAR in real time without compromising the resolution.…”

Section: Introductionmentioning

confidence: 99%

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

Pan

Bai

et al. 2018

Sensors

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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.

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Section: Prototype Setup and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%