Patent ID: 9029800
Filing Date: 2015-05-12
Classification: G01J,G01N

Abstract:
1. An apparatus for analyzing a sample that may comprise particles of at least a first and second particle type, the apparatus comprising: a flow channel through which the sample can pass; a first light source adapted to emit first excitation light into a first excitation portion of the flow channel, the first excitation light adapted to stimulate a first light emission from particles of the first particle type; a second light source adapted to emit second excitation light into a second excitation portion of the flow channel, the second excitation light adapted to stimulate a second light emission from particles of the second particle type; a detector disposed to receive at least a portion of the first and second light emission from the corresponding particles that may be present in the sample in a detection portion of the flow channel, the detection portion overlapping with the first and second excitation portions of the flow channel, the detector adapted to provide a detector output based on the received light emission; and a spatial filter having a pattern of variable transmission, the spatial filter being disposed between the detection portion of the flow channel and the detector, the spatial filter further being adapted to transmit light emanating from the particles that may be present in the flow channel by varying amounts as such particles travel along the detection portion of the flow channel; wherein the first light source is adapted to emit the first excitation light at a first modulation frequency ν