UNIVERSAL FLUID DROPLET EJECTOR

摘要

A droplet generator (22) comprises a fluid reservoir (58) having a side wall (60) made of glass or quartz, and an end cap (96) made from a silicon plate. The end cap (96) contains a micromachined aperture (24) through which the fluid is ejected. The side wall (60) is thermally fused to the end cap, and no adhesive is necessary. This means that the fluid only comes into contact with the side wall (60) and the end cap (96), both of which are chemically inert. Amplitudes of drive pulses received by the fluid reservoir (58) determine the horizontal displacements of droplets relative to the ejection aperture (24). The drive pulses are varied such that the dropper (22) generates a two-dimentional array (50) of vertically-falling droplets. Vertical and horizontal inter-droplet spacings may be varied in real time. Applications include droplet analysis experiments such as Millikan fractional charge searches and aerosol characterization, as well as material deposition applications.