Claims
- 1. An airborne particle impaction sampler, comprising:
a base; a microscope slide disposed on said base; an adhesive media located on said microscope slide to assist in adhering airborne particles on said microscope slide; a top cap secured to said base, said top cap having an inlet opening formed therethrough; said inlet opening having an outer venturi section and an inner laminar section such that air entering the sampler impacts said adhesive media.
- 2. The sampler of claim 1, wherein said inlet opening has a pair of generally straight opposing side portion and a pair of arcuate end portions.
- 3. The sampler of claim 2, wherein said venturi section has a pair of oval sides that extend generally inward from a respective one of said arcuate end portions.
- 4. The sampler of claim 3, wherein said venturi section has a pair of opposing side surfaces that converge towards one another.
- 5. The sampler of claim 1, wherein said top cap telescopically fits over said base.
- 6. The sampler of claim 1, wherein said base has a groove formed in its outer surface and an o-ring disposed in said groove to prevent air from leaking into said sampler when said top cap is secured to said base.
- 7. The sampler of claim 1, further comprising:
a vacuum source attached to the sampler for drawing air therein.
- 8. A method of gathering airborne particles in a slit impaction sampler, comprising:
providing a microscope slide; preparing said microscope slide with an adhesive media; loading said slide into a base portion of the sampler; assembling a top portion of the sampler to said base portion; connecting a vacuum source to an outlet opening of the sampler; drawing air into an inlet opening formed in said top portion of the sampler; accelerating air after it enters said inlet opening; and directing the air such that it impacts said adhesive media in a generally perpendicular direction.
- 9. The method of claim 8, wherein said adhesive media is applied to a middle two-thirds portion of said microscope slide.
- 10. The method of claim 8, further comprising:
precalibrating said vacuum source.
- 11. The method of claim 10, further comprising:
calibrating said vacuum source on-line during the gathering of airborne particles.
- 12. A slit impaction air sampling device, comprising:
a base portion having a recess formed in a top surface of said base portion, said recess being sized to receive a microscope slide; a microscope slide disposed in said recess; a depression formed in said top surface of said base portion, said depression having a depth that is larger than a depth of said recess, said depression being sized to allow air flow around said microscope slide; an outlet passage in communication with said depression at one end and a vacuum source at another end; a top cap secured to said base; and a venturi inlet formed in said top cap.
- 13. The device of claim 12, further comprising an adhesive media applied to said slide.
- 14. The device of claim 13, wherein said adhesive media is applied to a middle two-thirds portion of said microscope slide.
- 15. The device of claim 12, wherein said venturi inlet includes a tapered portion and a laminar portion, with said laminar portion being located adjacent said microscope slide.
- 16. The device of claim 15, wherein said tapered portion includes a pair of opposing converging slide surfaces that are connected by a respective arcuate portion.
- 17. The device of claim 16, wherein said laminar portion includes a pair of generally planar opposing side surfaces that extend from a respective one of said converging side surfaces.
- 18. The device of claim 16, wherein said top cap telescopically fits over said base.
- 19. The device of claim 12, wherein said base has a groove formed in an outer surface for receipt of an o-ring therein to prevent air from leaking into the device when said top cap is secured to said base portion.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority from applicant's co-pending provisional application, Serial No. 60/163,872, filed Nov. 5, 1999 and entitled “Slit-Air Sampler.”
Provisional Applications (1)
|
Number |
Date |
Country |
|
60163872 |
Nov 1999 |
US |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09705602 |
Nov 2000 |
US |
Child |
10057530 |
Jan 2002 |
US |