The alignment and collection of side-scattered light in scattering measurement on individual cells, based on hydraulic focusing technology, is always time-consuming and troublesome. Even small errors result in a poor SNR. This paper presents an optical system including a specially designed telecentric lens to focus stray light and scattering signals. The lens has a compact structure, small distortion and aberration, and large depth of focus. Thus scattering signals can be extracted easily and effectively, even when the spatial filters are out of focus or tilted with respect to the optical axis by human error. Also, the stray light in the side direction is analyzed, and the results show good performance of this special telecentric lens. Scattering results on 4.91-and 16.32-m polystyrene beads verify that this optical system can be well applied for sidescattering signal detection.

No abstract