Abstract
Lock-in phenomenon in ring laser gyroscopes is directly related to effective
backscattering, which includes both backscattering and nonuniform loss. Effective
backscattering often differs in different states and can only be reflected in a
working state via online estimation in the working state. Moreover, effective
backscattering can result in the intensity modulation of beams in the opposite
directions. The effective backscattering parameters can be obtained by measuring the
weak modulations in the intensity signals under different rotation rates and by
using the curve-fitting method. This letter demonstrates the online estimation of
backscattering.
© 2012 Chinese Optics Letters
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