GB1335467A - Optical aerosol counter - Google Patents
Optical aerosol counterInfo
- Publication number
- GB1335467A GB1335467A GB1335467DA GB1335467A GB 1335467 A GB1335467 A GB 1335467A GB 1335467D A GB1335467D A GB 1335467DA GB 1335467 A GB1335467 A GB 1335467A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- light
- stream
- focused
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 title abstract 3
- 239000000443 aerosol Substances 0.000 title 1
- 239000002245 particle Substances 0.000 abstract 9
- 239000007788 liquid Substances 0.000 abstract 2
- 239000004593 Epoxy Substances 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1434—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1486—Counting the particles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1493—Particle size
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Optical Measuring Cells (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1335467 Optical particle sensor COULTER ELECTRONICS INC 29 Jan 1971 3497/71 Heading G1A [Also in Division G2] In an optical particle sensor for determining the size and concentration of particles suspended in a flowing liquid or gas, the flow stream is directed through a housing 19 (along axis FS), light is focused at a point within the stream, passing through an aperture 26 in mask 24, and light scattered by the particles is detected. The detector is a photo-multiplier 18 having an end surface 21, and associated with the housing 19 such that light scattered (diffracted) at large angles, and even that reflected from particles, reaches the surface 21, if necessary via reflection from internal walls 31 which are highly reflective. Only light directly transmitted through the stream and unaffected by particles is prevented from reaching the detector by virtue of a curved, black mirror 27, which reflects this light back along its original path. The light directed to the focusing lens is obtained from a source (12) Fig.1, (not shown), via a collecting lens (13) and an aperture (14). Flow cell. For particles suspended in a gas, the flow cell is provided by two tapered tubes of moulded epoxy, the tips of which separated by a small gap where the light beam is focused. Tubes 17 are of stainless steel. The lower tip opening is slightly larger than the upper one. For liquid streams, a rectangular section flow tube is provided having side windows which are internally flat and curved externally. Calibration. Fig.3. A needle 46 attached to timing fork 44 is vibrated to simulate particles, the frequency of vibration representing the number and the amplitude representing the size of particles.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB349771 | 1971-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1335467A true GB1335467A (en) | 1973-10-31 |
Family
ID=9759455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1335467D Expired GB1335467A (en) | 1971-01-29 | 1971-01-29 | Optical aerosol counter |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1335467A (en) |
-
1971
- 1971-01-29 GB GB1335467D patent/GB1335467A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |