A novel method and system are disclosed for detecting the breakpoint of a perturbed flow stream. The scattering and extinction of light caused by a perturbed stream at a preselected flow stream sensing point therealong is measured to produce a real time waveform proportional thereto. The real time waveform...http://www.google.com.hk/patents/US4317520?utm_source=gb-gplus-share專利 US4317520 - Servo system to control the spatial position of droplet formation of a fluid jet in a cell sorting apparatus
