Impaction substrate and methods of use
AssigneePresident and Fellows of Harvard College
InventorsStephen T. Ferguson, Ilias G. Kavouras, Jack M. Wolfson, Petros Koutrakis
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Abstract
The present disclosure relates to a method of collecting particles in a gas sample comprising impacting particles in the gas sample on a porous material, as well as to impactors wherein an inertial impactor includes a porous substrate.
Claims66
A method of collecting particles in an accelerated gas sample, comprising:
- passing said gas sample through an inertial impactor;
- and
- impacting particles in said gas sample on a dry porous foam material.
A method for sampling particles of a particular size range in a gas sample, comprising:
- passing said gas sample through a size-selective inlet to remove particles above a predetermined upper size from said gas sample;
- passing said gas sample through an acceleration nozzle;
- and
- collecting particles which pass through said acceleration nozzle on a dry porous impaction substrate, wherein said impaction substrate comprises foam.
An inertial impactor, comprising:
- a sample inlet for receiving a stream of gas;
- a housing coupled to said sample inlet;
- an acceleration nozzle mounted within said housing to increase the velocity of the stream of gas;
- and
- an impaction substrate comprising a dry porous foam material disposed adjacent to said acceleration nozzle to collect particles from said stream of gas.
A multistage gas sampling system comprising a plurality of impaction substrates configured such that a stream of air will pass sequentially over the impaction substrates, wherein at least one of said substrates comprises a dry porous material.
A method of manufacturing an inertial impactor, comprising:
- providing a housing;
- mounting within said housing an acceleration nozzle;
- and
- mounting adjacent to said acceleration nozzle an impaction substrate comprising a dry porous foam material.
An inertial impactor, comprising:
- an air inlet for receiving a stream of gas;
- a housing coupled to said inlet;
- an acceleration nozzle mounted within said housing to increase the velocity of said stream of gas;
- and
- an impaction substrate comprising a dry porous cloth material aligned with said acceleration nozzle to collect particles from said stream of gas.
A method of collecting particles in an accelerated gas stream, comprising:
- passing said gas stream through an inertial impactor;
- and
- impacting particles in said gas stream on a dry porous cloth material.
A method for sampling particles of a particular size range in a gas sample, comprising:
- passing said gas sample through a size-selective inlet to remove particles above a predetermined upper size from said gas sample;
- passing said gas sample through an acceleration nozzle;
- and
- collecting particles which pass through said acceleration nozzle on a dry porous impaction substrate, wherein said impaction substrate comprises cloth.
A method of manufacturing an inertial impactor, comprising:
- providing a housing;
- mounting within said housing an acceleration nozzle;
- and
- mounting adjacent to said acceleration nozzle an impaction substrate comprising a dry porous cloth material.
Dependencies are inferred from the claim text.