System and method for passively monitoring a sample

Abstract

A system for passively monitoring a sample is disclosed. The system comprises an optical arrangement, a filtering unit and a detector unit. The optical arrangement is configured for collecting light arriving from a sample, directing the collected light to the filtering unit for filtering based on at least one of spatial and spectral composition and directing the collected light onto the detector unit. The optical arrangement and the detector unit are arranged to provide imaging of collected light from the sample on the detector unit with selected focusing/defocusing level to generate image data pieces comprising speckle patterns formed in the collected light.

Dependencies are inferred from the claim text.