A detector system comprising illuminating means, a plurality of light guides (11a, 11b, 11c, 11d), each guiding incoming light from a respective object in use, wherein the incoming light is provided by means of the illuminating means, said illuminating means comprising at least one light source for providing light into each light guide (11a, 11b, 11c, 11d), wherein light from the illuminating means is transmitted through the object and at least partially collected by a corresponding light guide receiving the incoming light from said object; diffracting means for diffracting the incoming light in different wavelength ranges, at least one focuser for projecting the incoming light exiting the light guides onto the diffracting means, a detector having a detector area for receiving the diffracted light from the plurality of light guides, and a control unit arranged to: operate the illuminating means to pulsate incoming light via only one light guide at a time based on a pulse timing parameter configured to indicate the timing for activation of each light source of the illuminating means, and record a spectrum of light diffracted from each light guide and detected by the detector based on the pulse timing parameter, wherein a first sub area of the detector area for receiving light diffracted from a first light guide overlaps on the detector area with a second sub area of the detector area for receiving light diffracted from a second light guide, and wherein at least two of the plurality of light guides (11a, 11b, 11c, 11d) are arranged one above the other along a height axis in a geometrical configuration, and wherein the detector area has a height extending parallel to the height axis and a width for receiving the diffracted light beams from the plurality of light guides. a plurality of light guides (11a, 11b, 11c, 11d), each guiding incoming light from a respective object in use, wherein the incoming light is provided by means of the illuminating means, said illuminating means comprising at least one light source for providing light into each light guide (11a, 11b, 11c, 11d), wherein light from the illuminating means is transmitted through the object and at least partially collected by a corresponding light guide receiving the incoming light from said object; diffracting means for diffracting the incoming light in different wavelength ranges, at least one focuser for projecting the incoming light exiting the light guides onto the diffracting means, a detector having a detector area for receiving the diffracted light from the plurality of light guides, and a control unit arranged to: operate the illuminating means to pulsate incoming light via only one light guide at a time based on a pulse timing parameter configured to indicate the timing for activation of each light source of the illuminating means, and record a spectrum of light diffracted from each light guide and detected by the detector based on the pulse timing parameter, operate the illuminating means to pulsate incoming light via only one light guide at a time based on a pulse timing parameter configured to indicate the timing for activation of each light source of the illuminating means, and record a spectrum of light diffracted from each light guide and detected by the detector based on the pulse timing parameter, wherein a first sub area of the detector area for receiving light diffracted from a first light guide overlaps on the detector area with a second sub area of the detector area for receiving light diffracted from a second light guide, and wherein at least two of the plurality of light guides (11a, 11b, 11c, 11d) are arranged one above the other along a height axis in a geometrical configuration, and wherein the detector area has a height extending parallel to the height axis and a width for receiving the diffracted light beams from the plurality of light guides.