Patent ID: 8647860
Filing Date: 2014-02-11
Classification: C12Q,G01N

Abstract:
1. A particle detector system, comprising: a sample cell; a light source on one side of a sample cell for sending a focused beam of light along a path to and through the sample, the direction of the beam of light through the sample cell defining an axis, whereby portions of the beam of light are scattered at various angles by particles of various sizes present in the sample area, and an unscattered portion of the beam of light remains unscattered; a beam blocking device on an opposite side of the sample cell along the axis for blocking at least the unscattered portion of the beam of light and configured to limit a range of particles measured, such that light scattered from particles of a predetermined size range proceeds past the beam blocking device along a light path; a first detector positioned in the light path after the beam blocking device along the axis for detecting a portion of forward scattered light, and producing an output including information on the size of a single particle in the light path within a predetermined size range; a second detector positioned off the axis from the beam of light for detecting intrinsic fluorescence from said same single particle.