Particle impactor assembly for size selective high volume air sampler

Patent · Tue Aug 16 00:00:00 EDT 1988

OSTI ID:866681

Langer, Gerhard ^[1]

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1. Boulder, CO

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.

• Research Organization: Rockwell International Corp., Canoga Park, CA (United States)
• DOE Contract Number: AC04-76DP03533
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4764186
• Application Number: 07/028,981
• OSTI ID: 866681
• Country of Publication: United States
• Language: English

Related Subjects

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/