US3564272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for examination of smoke or dust laden gas
Assignee: Central Electricity Generating Board
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Filing: 1968-07-09
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Granted: 1971-02-16
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Expires: 1988-07-09
Abstract
Abstract An optical device for examination of smoke- or dust-laden gases such as flue gas from a furnace. The device comprises a tube with a lamp at one end and a photocell at the other end and diametrically opposite slots in the tube to allow the gas to be examined to pass between the lamp and the photocell. Means are provided to ensure that there is a flow of air away from each end of the tube towards the slots to prevent dust from the gas reaching the lamp and photocell.
Inventors
- 👤 Edmund James Payton
- 👤 Colin Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:14
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/15
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
A device according to claim 1 wherein said first end portion includes a chamber to which said air inlet means and said duct open, and passage means leading from said chamber to the remainder of said first end portion.
Claim 2
Dependent Claim
27 words
A device according to claim 2 further comprising an air pump mounted on said tube at said first end portion and connected to said air inlet means.
Claim 3
Dependent Claim
39 words
A device according to claim 1 further comprising a baffle extending from said first end portion into said central portion, said baffle having a central aperture for the passage of light from said light source to said photosensitive device.
Claim 4
Dependent Claim
42 words
An optical device according to claim 1 further comprising a second baffle extending from said second end portion into said central portion, said second baffle having a central aperture for the passage of light from said light source to said photosensitive device.
Claim 5
Dependent Claim
57 words
An optical device according to claim 1 further comprising a first baffle extending from said first end portion into said central portion and a second baffle extending from said second end portion into said central portion, said first and second baffles having central apertures for the passage of light from said light souRce to said photosensitive device.
Claim 6
Dependent Claim
46 words
A device according to claim 1 further comprising a first disclike element having a first hinged flap and mounted between said photosensitive device and said central portion and a second disclike element having a hinged flap and mounted between said light source and said central portion.
Claim 7
Dependent Claim
23 words
A device according to claim 1 in which said diametrically opposed apertures in the tube are in the form of longitudinally extending slots.
Claim 8
Dependent Claim
156 words
An optical device for monitoring smoke- or dust-laden gas within a flue, comprising: a tube having a first end portion, a second end portion and a central portion between said end portions, a light source mounted in one end portion, a photosensitive device is mounted in the other end portion to receive light from said light source, said central portion and one end portion are positioned in said flue essentially perpendicular to the gas flow, said central portion having diametrically opposed slots to permit the gas within the flue to flow across the longitudinal axis of said tube between said light source and said photosensitive device, an air duct extending along and within said tube from said first end portion to said second end portion, an air pump mounted on said tube at said first end portion, and a pressurized air discharge line connecting said pump to said air duct and to said first end portion.
Claim 9
Dependent Claim
58 words
A device according to claim 9 further comprising a plurality of baffles extending from said first end portion into said central portion, and a plurality of baffles extending from said second end portion into said central portion, each of said baffles having a central aperture for the passage of light from said light source to said photosensitive device.
Claim 10
Dependent Claim
15 words
A device according to claim 10 in which said baffles each comprise a helical element.
Claim 11
Dependent Claim
29 words
A device according to claim 10 in which one baffle in both of said plurality of baffles carries a hinged flap to close said central aperture in the baffle.
Claim 12
Dependent Claim
124 words
A device according to claim 1 further comprising means for rotatably mounting said tube to said flue, and first and second sealing elements each having a central aperture and a hinged closing member, said first sealing element is mounted in said tube between said light source and said central portion and said second sealing element is mounted between said photosensitive device and said central portion, said closing members seal said sealing elements with said tube rotated to a first position in which said opposed apertures are substantially perpendicular to the gas flow and said closing members fall away from and unseal said sealing members with said tube rotated to a second position in which said opposed apertures are substantially parallel to the gas flow.
References Cited (Backward Citations)
US2691737A
Cited
US3361030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |