Journal
OPTICS EXPRESS
Volume 27, Issue 15, Pages 21929-21945Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.021929
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Funding
- National Natural Science Foundation of China (NSFC) [51875447, 51635010]
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A new frequency-scanning interferometry (FSI) scheme using in-phase and quadrature (IQ) detection for real-time and rapid absolute optical ranging is presented. Dynamic measurement with FSI modulates interference signal frequency by both target movement and time-varying optical-frequency scanning rate; hence, a dynamic model is proposed to decouple dynamic absolute distance from the instantaneous frequency of interference signals. The unscented Kalman filter and particle filter algorithms are implemented for the nonlinear first-layer and non-Gaussian second-layer models, respectively. The proposed FSI scheme eliminates nonlinear optical-frequency scanning effects in dynamic measurements and realizes real-time measurement only current observed data are used. Experimental results verify high tracking performance for a vibrating target with approximately 10 mu m amplitude and 50-500 Hz frequency. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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