GB918908A - Improvements in or relating to particle detectors - Google Patents
Improvements in or relating to particle detectorsInfo
- Publication number
- GB918908A GB918908A GB4368561A GB4368561A GB918908A GB 918908 A GB918908 A GB 918908A GB 4368561 A GB4368561 A GB 4368561A GB 4368561 A GB4368561 A GB 4368561A GB 918908 A GB918908 A GB 918908A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detector
- tube
- chamber
- light
- photo
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material 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
918,908. Photo-electric particle detectors. PYROTECTOR Inc. Dec. 6, 1961 [March 9, 1961], No. 43685/61. Class 40 (3). Apparatus for detecting by photo-electric means particles suspended in a fluid comprises a housing forming a dark chamber 24 through which the fluid passes, a light source 14 projecting a beam across the chamber on to an opposite surface, a detector 16 which views the chamber in a direction perpendicular to the beam and a lens 40 which focuses the image of the detector through the beam to a point beyond the beam, the detector being shielded from the direct view of the source 14 and from the surface onto which the beam is projected. In the embodiment shown, to reduce the amount of stray light reaching the detector, the beam from a lamp 14 is focused by a lens 36 carried in a tube 32, to a minimum size on the bottom of a light trap tube 34 and the detector 16 is carried in a tube 38 one side of which is extended to form a shield 42, the other side forming an inclined shield 44, these shields preventing stray light from the focusing tube 32 and the light trap 34, from reaching the detector. The detector may be a photoresistive cell preferably of the cadmium sulphide type.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9453261A | 1961-03-09 | 1961-03-09 | |
| CH662662A CH405751A (en) | 1962-06-01 | 1962-06-01 | Device for indicating the presence of suspended particles in a gaseous or liquid medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB918908A true GB918908A (en) | 1963-02-20 |
Family
ID=25699888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4368561A Expired GB918908A (en) | 1961-03-09 | 1961-12-06 | Improvements in or relating to particle detectors |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB918908A (en) |
| NL (1) | NL279559A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401936A (en) * | 2003-05-23 | 2004-11-24 | Apollo Fire Detectors Ltd | Light sensor for smoke detector |
-
0
- NL NL279559D patent/NL279559A/xx unknown
-
1961
- 1961-12-06 GB GB4368561A patent/GB918908A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2401936A (en) * | 2003-05-23 | 2004-11-24 | Apollo Fire Detectors Ltd | Light sensor for smoke detector |
Also Published As
| Publication number | Publication date |
|---|---|
| NL279559A (en) |
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