B008 Enhancement of sensing resolution for minute refractive index change of micro flow by light interferometer using stochastic resonance

Abstract

A visualization method for micro flow using light interferometer to sense the change of refractive index in flow is proposed. In particular, the concept of this method is that noise is added to enhance the sensing resolution based on stochastic resonance. The feasibility of this method was tested by a fundamental experiment. By using scattered light derived from Brownian particles as the noise source, instead of refractive index change, the given displacement of 10nm in optical length difference was distinguished successfully with even 4-bits camera.