Patent US4213699A successfully refreshed from Google Patents.
US4213699A
Expired / Lapsed
US
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Method of measuring low concentrations of a light absorbing component
Assignee: Chevron Belgium NV
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Filing: 1976-02-27
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Granted: 1980-07-22
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Expires: 1996-02-27
Abstract
Abstract A laser beam is transmitted through a medium containing the component to be measured. The wavelength of the beam is such that it is absorbed by the component but not by the remainder of the medium. The divergence of the beam is measured to indicate a change in the index of refraction of the medium due to the absorption by the component.
Inventors
- 👤 Malcolm Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:17
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/18; G01N33/1826; G01N33/1833; G01N21/00; G01N21/17; G01N21/171
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
Method of measuring low concentrations of oil in a transparent medium, comprising transmitting a laser beam through said medium, said beam having a wavelength of about 448.0 millimicrons which is absorbed by said oil, and determining the amount of divergence of said beam created by passage through said medium.
Claim 2
Dependent Claim
49 words
Method of measuring low concentrations of oil in a transparent medium, comprising transmitting a laser beam through said medium, said beam having a wavelength of about 448.0 millimicrons which is absorbed by said oil, and determining the amount of divergence of said beam created by passage through said medium.
Claim 3
Dependent Claim
29 words
Method according to claim 1, wherein said amount of divergence is determined by measuring the width of the image of said beam at a predetermined distance from said medium.
Claim 4
Dependent Claim
21 words
Method according to claim 2, wherein said amount of divergence measurement is made by scaling said image width on a screen.
Claim 5
Dependent Claim
28 words
Method according to claim 2, wherein said amount of divergence measurement is made by a plurality of photodetectors situated in the plane of said image of said beam.
Claim 6
Dependent Claim
76 words
Method of measuring low concentrations in a fluid sample of crude oil dissolved in carbon tetrachloride, benzene and water, comprising transmitting a beam of laser light having a wavelength of 448.0 millimicrons, said beam being directed vertically through said sample, said beam being substantially cylindrical with a predetermined width, and measuring the width of the image of said beam after passing through said sample at a predetermined distance therefrom by scaling said image on a screen.
Claim 7
Dependent Claim
76 words
Method of measuring low concentrations in a fluid sample of crude oil dissolved in carbon tetrachloride, benzene and water, comprising transmitting a beam of laser light having a wavelength of 448.0 millimicrons, said beam being directed vertically through said sample, said beam being substantially cylindrical with a predetermined width, and measuring the width of the image of said beam after passing through said sample at a predetermined distance therefrom by scaling said image on a screen.
Claim 8
Dependent Claim
27 words
Method according to claim 5, wherein said beam width measurement is made by locating a plurality of photodetectors in the plane of said image of said beam.
Claim 9
Dependent Claim
47 words
System for measuring low concentrations of oil in a transparent medium, comprising means for transmitting a laser beam through said medium, said beam having a wavelength of about 448.0 millimicrons, and means for determining the amount of divergence of said beam created by passage through said medium.
Claim 10
Dependent Claim
47 words
System for measuring low concentrations of oil in a transparent medium, comprising means for transmitting a laser beam through said medium, said beam having a wavelength of about 448.0 millimicrons, and means for determining the amount of divergence of said beam created by passage through said medium.
Claim 11
Dependent Claim
29 words
System according to claim 7, wherein said means for determining comprises means for measuring the width of the image of said beam at a predetermined distance from said medium.
Claim 12
Dependent Claim
23 words
System according to claim 8, wherein said means for measuring the width of the image comprises a screen located at said predetermined distance.
Claim 13
Dependent Claim
29 words
System according to claim 8, wherein said means for measuring the width of the image comprises a plurality of photo detectors located on a plane at said predetermined distance.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-22 | 1984-01-21 | 1984-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-22 | 1988-01-21 | 1988-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-22 | 1992-01-21 | 1992-07-22 | $7700.00 | Window Closed / Lapsed |