US3603689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning scattered light photometer
Assignee: United States Department of the Air Force
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Filing: 1969-10-13
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Granted: 1971-09-07
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Expires: 1989-10-13
Abstract
Abstract A scanning scattered light photometer system having a rotor with a beamsplitter-polarizer and a nozzle for directing an aerosol flow along the axis of the rotor toward an exhaust outlet. The aerosol flow is illuminated by a collimated monochromatic unpolarized light. A polarizing beamsplitter on the rotor separates the scattered light into two perpendicular components. A first mirror on the rotor directs a first polarized component of light in the plane of rotation of the rotor toward a first photomultiplier. A second mirror on the rotor directs light polarized perpendicular to the plane of rotation toward a second photomultiplier. A fixed mirror directs undispersed light toward a photoconductive device to provide a synchronizing output pulse when the polarizer beamsplitter passes through the beam between the light source and the aerosol flow. The outputs of the photomultipliers and photoconductive device are fed to a ratio and averaging circuit and then to a recorder.
Inventors
- 👤 James William Shelnutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/21; G01N15/00; G01N15/02; G01N15/0205; G01N21/47; G01N21/49; G01N21/53; G01N2021/4792
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A device for providing an output signal proportional to the two polarized components of light scattered by a flowing aerosol for all angular positions in a predetermined 180* region around the flowing aerosol comprising: means for providing a sample flow; means for directing a beam of collimated monochromatic unpolarized light toward said flow; a beamsplitter polarizer; an apertured mask between said beamsplitter polarizer and said sample flow; means for moving said mask and said polarizer in a circular path around said sample flow; a first photomultiplier tube; means for directing a first polarized component of light scattered by the flowing aerosol, in the plane of said circular path, toward said first photomultiplier tube; a second photomultiplier scattered by the flowing aerosol, perpendicular to the plane of said circular path, toward said second photomultiplier tube; means responsive to the output of said photomultipliers for providing an output signal proportional to the output of the first photomultiplier tube and the second photomultiplier tube.
Claim 2
Independent Claim
161 words
A device for providing an output signal proportional to the two polarized components of light scattered by a flowing aerosol for all angular positions in a predetermined 180* region around the flowing aerosol comprising: means for providing a sample flow; means for directing a beam of collimated monochromatic unpolarized light toward said flow; a beamsplitter polarizer; an apertured mask between said beamsplitter polarizer and said sample flow; means for moving said mask and said polarizer in a circular path around said sample flow; a first photomultiplier tube; means for directing a first polarized component of light scattered by the flowing aerosol, in the plane of said circular path, toward said first photomultiplier tube; a second photomultiplier scattered by the flowing aerosol, perpendicular to the plane of said circular path, toward said second photomultiplier tube; means responsive to the output of said photomultipliers for providing an output signal proportional to the output of the first photomultiplier tube and the second photomultiplier tube.
Claim 3
Dependent Claim
90 words
The device as recited in claim 1 wherein said means for providing an output signal includes an analog divider means for providing a signal proportional to the ratio of the output of said first photomultiplier and the output of said second photomultiplier; a signal averaging circuit connected to the output of said analog divider means; means for supplying a signal to said signal averaging circuit for synchronizing the signal averaging circuit with the rotation of the polarizer in said circular path; an output circuit connected to said signal averaging circuit.
Claim 4
Dependent Claim
14 words
The device as recited in claim 2 wherein said output circuit includes a recorder.
Claim 5
Dependent Claim
16 words
The device as recited in claim 2 wherein said output circuit includes a visual display device.
Claim 6
Dependent Claim
89 words
The device as recited in claim 2 wherein said means for synchronizing the signal averaging circuit with the rotation of the polarizer includes a photovoltaic cell; a stationary mirror positioned in line with the beam of collimated monochromatic unpolarized light; said means for moving said polarizer in a circular path being a rotor for moving the polarizer into the light beam path once during each revolution of the rotor to block light to said stationary mirror and photovoltaic cell to thereby provide a synchronizing signal for said averaging circuit.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |