Patent ID: 9222869
Filing Date: 2015-12-29
Classification: G01N

Abstract:
1. A sheath flow device, comprising: a reflecting plane; an aspheric reflecting surface comprising a focal point; a conduit comprising a central hollow and configured to allow passage of cells disposed in the central hollow; and a transmission plane adjoining the reflecting plane, the transmission plane configured such that: a parallel light vertically incident on a first transmissive side of the transmission plane is transmitted thereby to reach the first reflective side of the reflecting plane, reflected thereby to reach the first reflective surface of the aspheric reflecting surface, and reflected thereby before being focused on the focal point to reach the second reflective surface of the aspheric reflecting surface to be reflected thereby to reach the second reflective side of the reflecting plane, and to be reflected thereby to reach a second transmissive side of the transmission plane to be transmitted; and wherein the first and second transmissive sides of the transmission plane, the first and second reflective sides of the reflecting plane, and the first and second reflective surfaces of the aspheric reflecting surface are centrosymmetric, wherein: the focal point of the aspheric reflecting surface is positioned in a location where the cells settle; the reflecting plane and the aspheric reflecting surface are configured such that a collimated beam generated by an external light source incident on a first reflective side of the reflecting plane is reflected thereby to reach a first reflective surface of the aspheric reflecting surface, and is reflected thereby before being focused on the focal point to reach a second reflective surface of the aspheric reflecting surface to be reflected thereby to reach a second reflective side of the reflecting plane to emerge after being reflected thereby; and the first and second reflective sides of the reflecting plane and the first and second reflective surfaces of the aspheric reflecting surface are centrosymmetric.