A sensing system comprising - At least one fluidic channel (104, 401) for providing at least one analyte (105,202) into at least one region of interest, - at least one radiation transport system, for providing visible, IR, or UV, excitation radiation (103,203) for exciting analytes traversing the at least one region of interest, so that the analytes emit or scatter a radiation signal upon receiving such excitation radiation, - a radiation collection system for collecting radiation signals emitted from the at least one region of interest, wherein the at least one radiation transport system is adapted to provide excitation radiation (103,203) comprising a plurality of excitation radiation intensity peaks (101, 102, 211, 212), wherein the sensing system furthermore comprises means (302, 303) for measurement of the speed of the at least one analyte within the fluidic channel (104, 401), based on the collected radiation signals emitted from the at least one region of interest, the means for measurement of speed comprising timing means for obtaining the time between maxima in radiation signals emitted by the at least one analyte (105,202), the sensing system characterized in that the at least one radiation transport system is adapted to provide excitation radiation (103,203) comprising a plurality of excitation radiation intensity peaks (101, 102, 211, 212) forming light sheets extending through the width of the fluidic channel (104, 401), the distance between the excitation radiation intensity peaks being known and being between half of the average diameter of the analyte and twice the average diameter of the analyte, so that the at least one analyte, when traversing the at least one region of interest, emits a radiation signal comprising a maximum (111, 112; 603, 604, 606, 607) in its intensity upon crossing each of the plurality of excitation radiation intensity peaks. - At least one fluidic channel (104, 401) for providing at least one analyte (105,202) into at least one region of interest, - at least one radiation transport system, for providing visible, IR, or UV, excitation radiation (103,203) for exciting analytes traversing the at least one region of interest, so that the analytes emit or scatter a radiation signal upon receiving such excitation radiation, - a radiation collection system for collecting radiation signals emitted from the at least one region of interest, wherein the at least one radiation transport system is adapted to provide excitation radiation (103,203) comprising a plurality of excitation radiation intensity peaks (101, 102, 211, 212), wherein the sensing system furthermore comprises means (302, 303) for measurement of the speed of the at least one analyte within the fluidic channel (104, 401), based on the collected radiation signals emitted from the at least one region of interest, the means for measurement of speed comprising timing means for obtaining the time between maxima in radiation signals emitted by the at least one analyte (105,202), the sensing system characterized in that the at least one radiation transport system is adapted to provide excitation radiation (103,203) comprising a plurality of excitation radiation intensity peaks (101, 102, 211, 212) forming light sheets extending through the width of the fluidic channel (104, 401), the distance between the excitation radiation intensity peaks being known and being between half of the average diameter of the analyte and twice the average diameter of the analyte, so that the at least one analyte, when traversing the at least one region of interest, emits a radiation signal comprising a maximum (111, 112; 603, 604, 606, 607) in its intensity upon crossing each of the plurality of excitation radiation intensity peaks.