Particle impactor assembly for size selective high volume air sampler
Abstract
Air containing entrained particulate matter is directed through a plurality of parallel, narrow, vertically oriented impactor slots of an inlet element toward an adjacently located, relatively large, dust impaction surface preferably covered with an adhesive material. The air flow turns over the impaction surface, leaving behind the relatively larger particles according to the human thoracic separation system and passes through two elongate exhaust apertures defining the outer bounds of the impaction collection surface to pass through divergent passages which slow down and distribute the air flow, with entrained smaller particles, over a fine filter element that separates the fine particles from the air. The elongate exhaust apertures defining the impaction collection surface are spaced apart by a distance greater than the lengths of elongate impactor slots in the inlet element and are oriented to be normal thereto. By appropriate selection of dimensions and the number of impactor slots air flow through the inlet element is provided a nonuniform velocity distribution with the lower velocities being obtained near the center of the impactor slots, in order to separate out particles larger than a certain predetermined size on the impaction collection surface. The impaction collection surface, even in a moderately sized apparatus,more »
- Inventors:
-
- Boulder, CO
- Issue Date:
- Research Org.:
- Rockwell International Corp., Canoga Park, CA (United States)
- OSTI Identifier:
- 866681
- Patent Number(s):
- 4764186
- Application Number:
- 07/028,981
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- AC04-76DP03533
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- particle; impactor; assembly; size; selective; volume; air; sampler; containing; entrained; particulate; matter; directed; plurality; parallel; narrow; vertically; oriented; slots; inlet; element; adjacently; located; relatively; dust; impaction; surface; preferably; covered; adhesive; material; flow; leaving; larger; particles; according; human; thoracic; separation; passes; elongate; exhaust; apertures; defining; outer; bounds; collection; pass; divergent; passages; slow; distribute; fine; filter; separates; spaced; apart; distance; lengths; normal; thereto; appropriate; selection; dimensions; provided; nonuniform; velocity; distribution; velocities; obtained; near; center; separate; predetermined; moderately; sized; apparatus; permits; prolonged; sampling; periods; extending; weeks; predetermined size; air sampler; adhesive material; appropriate selection; fine particles; particulate matter; filter element; vertically oriented; spaced apart; air flow; air sample; air containing; collection surface; larger particles; particle impact; relatively larger; fine particle; velocity distribution; containing entrained; volume air; entrained particulate; /95/55/73/96/
Citation Formats
Langer, Gerhard. Particle impactor assembly for size selective high volume air sampler. United States: N. p., 1988.
Web.
Langer, Gerhard. Particle impactor assembly for size selective high volume air sampler. United States.
Langer, Gerhard. Tue .
"Particle impactor assembly for size selective high volume air sampler". United States. https://www.osti.gov/servlets/purl/866681.
@article{osti_866681,
title = {Particle impactor assembly for size selective high volume air sampler},
author = {Langer, Gerhard},
abstractNote = {Air containing entrained particulate matter is directed through a plurality of parallel, narrow, vertically oriented impactor slots of an inlet element toward an adjacently located, relatively large, dust impaction surface preferably covered with an adhesive material. The air flow turns over the impaction surface, leaving behind the relatively larger particles according to the human thoracic separation system and passes through two elongate exhaust apertures defining the outer bounds of the impaction collection surface to pass through divergent passages which slow down and distribute the air flow, with entrained smaller particles, over a fine filter element that separates the fine particles from the air. The elongate exhaust apertures defining the impaction collection surface are spaced apart by a distance greater than the lengths of elongate impactor slots in the inlet element and are oriented to be normal thereto. By appropriate selection of dimensions and the number of impactor slots air flow through the inlet element is provided a nonuniform velocity distribution with the lower velocities being obtained near the center of the impactor slots, in order to separate out particles larger than a certain predetermined size on the impaction collection surface. The impaction collection surface, even in a moderately sized apparatus, is thus relatively large and permits the prolonged sampling of air for periods extending to four weeks.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 16 00:00:00 EDT 1988},
month = {Tue Aug 16 00:00:00 EDT 1988}
}