Invented method and device system allow maintenance of particles in suspension with no interference with their structure. The slow mixing in the sensing chamber transforms the highly turbulent flow in a steady unidirectional flow that passes the detection system. Photodiodes detect the average signal additionally carrying the information from the area of maximal detection. The detector forwards the average signal containing additional information on the morphological and physiological characteristics of micro-particles. Applicable in all areas of research, detection, diagnosis and monitoring of aggregated micro-particles, such as water quality monitoring.