TERM	DEFINITION
anti-iced	Inlet and structure are continuously managed (usually by adding heat) to prevent build up of ice in supercooled water clouds. Contrast with de-iced where accumulated ice is removed by heat, alcohol, or other methods.
CVI	Counter-flow Virtual Impactor inlet
diffuser	Cone-shaped piping with cross section area increasing downstream to reduce flow velocity. 1-stage: single diffuser. 2-stage: two diffusers in series.
isokinetic	Air velocity at inlet tip exactly matches surrounding velocity. In this case, streamlines do not converge into the inlet or diverge around the inlet. Isokinetic operation is achieved by adjusting flow through the inlet piping. Favors preserving ambient particle concentration. Contrast with sub-isokinetic or super-isokinetic
laminar	smooth flow, as opposed to turbulent
LTI	Low Turbulence Inlet, developed by Univ. Denver. Turbulent flow that is generated in the boundary layer next to inlet walls is sucked through porous inner pipe into a second pipe that surrounds the sample piping, leaving the core flow laminar. Has higher efficiency for passing particles larger than ~ 3µm (depending on aircraft, speed, ..)
SDI	Solid Diffuser Inlet - simple diffusing inlet that does not have porous walls (compare LTI)
shroud	cylinder around and forward of inlet to straighten and align the flow with inlet axis. Shroud may also be a diffuser.