An assembly for measurements of one or more optical parameters of a medium is disclosed. The assembly comprises a light sheet generator, a light intensity modulator, a holder for a sample, and an optical sensor. The light sheet generator is configured to provide a polychromatic light sheet comprising a light spectrum extending in a first spatial dimension, wherein the polychromatic light sheet has a propagation path in a second spatial dimension. The light sheet generator comprises a light source configured to provide white light, a dispersive element configured to spread the white light in the first spatial dimension to provide the light spectrum, and an optical slit extending in the first spatial dimension configured to provide the polychromatic light sheet by limitation of the spread white light. The light intensity modulator is configured to provide an intensity modulated polychromatic light sheet by applying –to the polychromatic light sheet –an intensity modulation having a periodical (or substantially periodical) pattern in the first spatial dimension. The holder for a sample of the medium is configured to enable the intensity modulated polychromatic light sheet to illuminate the sample. The optical sensor is configured to record intensity of light exiting the sample over the light spectrum for provision of the one or more optical parameters. A method of using the assembly for measuring one or more optical parameters of a medium is also disclosed.
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