Abstract: In one example in accordance with the present disclosure, a system is described. The system includes a fluidic die to advance across an ejection path relative to a substrate. The fluidic die includes a channel to contain a portion of a sample fluid, a sensor to detect passage of a particle within the sample fluid into the channel, and an ejection device. The ejection device is to eject the particle. The system also includes a controller. The controller identifies discrete locations along the ejection path as waste sites as the fluidic die advances along the ejection path. This is done by 1) classifying the particle as a target particle or a non-target particle, 2) upon identification of a target particle, ejecting the target particle to a target site of the substrate, and 3) upon identification of a non-target particle, ejecting the non-target particle to a waste site.

Abstract: A droplet generator (100, 600, 700) having a bubble purging fluidic architecture comprises a firing chamber (110, 610, 710); an inlet (155, 655) fluidically connecting the firing chamber (110, 610, 710) to a fluid reservoir (140, 640, 740); and an outlet (120, 400, 620, 720) configured to pass fluid droplets being ejected from the firing chamber (110, 610, 710). The geometry of the outlet (120, 400, 620, 720) and the geometry of the inlet (155, 655) are configured such that the outlet (120, 400, 620, 720) geometry has a substantially lower barrier to expansion or motion of a bubble (300, 310, 410) than the inlet (155, 655) geometry.

Abstract: A droplet generator (100, 600, 700) having a bubble purging fluidic architecture comprises a firing chamber (110, 610, 710); an inlet (155, 655) fluidically connecting the firing chamber (110, 610, 710) to a fluid reservoir (140, 640, 740); and an outlet (120, 400, 620, 720) configured to pass fluid droplets being ejected from the firing chamber (110, 610, 710). The geometry of the outlet (120, 400, 620, 720) and the geometry of the inlet (155, 655) are configured such that the outlet (120, 400, 620, 720) geometry has a substantially lower barrier to expansion or motion of a bubble (300, 310, 410) than the inlet (155, 655) geometry.