An optical system (10) for a spectral component analysis of non-solid media, the system comprising: one or several light emitter assemblies (3), each comprising several light emitter modules (1) arranged in a curve along a ring-shaped circumference (3a) of the light emitter assembly (3); and one or several light detector assemblies (4), each comprising several light detector modules (2) arranged in a curve along a ring-shaped circumference (4a) of the light detector assembly (4), The light emitter assemblies (3) and the light detector assemblies (4) are coaxially arranged following one another along a common center axis (C) in an alternating manner.