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US3885162A
Expired / Lapsed
US
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Optical measuring apparatus
Assignee: Oerlikon Management USA Inc
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Filing: 1974-07-01
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Granted: 1975-05-20
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Expires: 1994-07-01
Abstract
Abstract A measuring apparatus for measuring the density of smoke and the like comprising a light source for emitting a beam of radiant energy which is directed through the smoke which is to be measured, and a first reflector positioned in the path of said beam for redirecting said beam. Chopping means are movable periodically into the path of the beam for interrupting the passage of the beam to the first reflector means. A second reflector means on the chopping means is movable in the path of the beam when the beam is interrupted by said chopping means. Means are provided for directing the light reflected by the first reflector means and the reflector means to a light sensitive means. This invention relates to optical measuring apparatus and particularly to measuring apparatus for measuring the optical transmittance of smoke and the like.
Inventors
- 👤 Lloyd M Geertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:10
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/534
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
130 words
In a measuring apparatus for measuring smoke density and the like, the combination comprising a stack or duct; a light source for emitting a beam of radiant energy through a portion of the sTack; first retro-reflector means in the path of said beam for redirecting said beam after it passes through the stack; chopping means in the stack movable periodically into the path of the beam for interrupting the passage of the beam to the first reflector means; second retro-reflector means on the chopping means movable in the path of the beam when the beam is interrupted by said chopping means; light sensitive means externally of the stack; and means for directing the light reflected by said first reflector means and said second reflector means to said light sensitive means.
Claim 2
Dependent Claim
130 words
In a measuring apparatus for measuring smoke density and the like, the combination comprising a stack or duct; a light source for emitting a beam of radiant energy through a portion of the sTack; first retro-reflector means in the path of said beam for redirecting said beam after it passes through the stack; chopping means in the stack movable periodically into the path of the beam for interrupting the passage of the beam to the first reflector means; second retro-reflector means on the chopping means movable in the path of the beam when the beam is interrupted by said chopping means; light sensitive means externally of the stack; and means for directing the light reflected by said first reflector means and said second reflector means to said light sensitive means.
Claim 3
Dependent Claim
28 words
The combination set forth in claim 1 wherein said chopping means comprises a rotating disc having an aperture therein; said second retro-reflector means being mounted on said disc.
Claim 4
Dependent Claim
61 words
The combination set forth in claim 1 wherein said means for directing said light from said first reflector means and said second reflector means comprises beamsplitter means externally of the stack between the light source and said first reflector means; said beamsplitter means redirecting the light from said first reflector means and said second reflector means to said light sensitive means.
Claim 5
Dependent Claim
23 words
The combination set forth in claim 1 including second aperture means in the stack between said light source and said first aperture means.
Claim 6
Dependent Claim
19 words
The combination set forth in claim 1 including a lens between said light source and said first reflector means.
Claim 7
Dependent Claim
21 words
The combination set forth in claim 1 including filter means in the path of light directed to said light sensitive means.
Claim 8
Dependent Claim
101 words
In an optical measuring apparatus, the combination comprising a light source for emitting a beam of radiant energy; a first reflector in the path of said beam for redirecting said beam; chopping means movable periodically into the path of the beam for interrupting the passage of the beam to the first reflector means; second retro-reflector means on the chopping means movable in the path of the beam when the beam is interrupted by said chopping means; light sensitive means; and means for directing the light reflected by said first reflector means and said second reflector means to said light sensitive means.
Claim 9
Dependent Claim
101 words
In an optical measuring apparatus, the combination comprising a light source for emitting a beam of radiant energy; a first reflector in the path of said beam for redirecting said beam; chopping means movable periodically into the path of the beam for interrupting the passage of the beam to the first reflector means; second retro-reflector means on the chopping means movable in the path of the beam when the beam is interrupted by said chopping means; light sensitive means; and means for directing the light reflected by said first reflector means and said second reflector means to said light sensitive means.
Claim 10
Dependent Claim
28 words
The combination set forth in claim 7 wherein said chopping means comprises a rotating disc having an aperture therein, said second retro-reflector means being mounted on said disc.
Claim 11
Dependent Claim
57 words
The combination set forth in claim 7 wherein said means for directing said light from said first reflector means and said second reflector means comprises beamsplitter means between the light source and said first reflector means; said beamsplitter means redirecting the light from said first reflector means and said second reflector means to said light sensitive means.
Claim 12
Dependent Claim
20 words
The combination set forth in claim 7 including second chopping means between said light source and said first chopping means.
Claim 13
Dependent Claim
19 words
The combination set forth in claim 7 including a lens between said light source and said first reflector means.
Claim 14
Dependent Claim
21 words
The combination set forth in claim 7 including filter means in the path of light directed to said light sensitive means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |