首页|Theoretical investigation of DFSI with immunity to both Doppler effect and frequency-sweep nonlinearity
Theoretical investigation of DFSI with immunity to both Doppler effect and frequency-sweep nonlinearity
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维普
Frequency-swept interferometry(FSI)is a well-known ranging technique,but it suffers from three problems,namely,the Doppler effect,the frequency-sweep nonlinearity,as well as the slow frequency-sweep rate.The first two problems hinder the measurement accuracy,while the third problem limits the measurement rate.In this paper,we present a dy-namic FSI(DFSI)that solves these three fundamental problems simultaneously.The DFSI consists of two auxiliary interferometers(AUI and AU2)and two measurement interferometers(FSI and frequency-fixed interferometry(FFI)).We use FSI to obtain the Doppler and nonlinearity affected ranging signal,AUI to monitor the frequency-tuning nonlinearity in the frequency-swept laser(FSL),and FFI and AU2 to constitute a laser vibrometer for monitoring the target motion-induced Doppler effect.Then,a novel signal fusion processing technique is applied to reconstruct the real dynamic distance from the above-measured signals.The dynamic ranging error caused by the Doppler effect and frequency-sweep nonlinearity in FSI can be eliminated and the dynamic distance at each sampling point can be ob-tained.The validity of this method is demonstrated by numerical experiments.
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维普
