US5139334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon analysis based on low resolution raman spectral analysis
Assignee: Precision Analyzer Company LP
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Filing: 1990-09-17
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Granted: 1992-08-18
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Expires: 2010-09-17
Abstract
Abstract A system is disclosed for measuring properties of samples associated with the distribution of hydrocarbons in the sample. The system includes a low resolution laser Raman spectrometer coupled to photodetectors that integrate the intensity of the scattered Raman radiation. The system further includes microprocessor means that separate the Raman spectrum into two spectral ranges, calculates a ratio of the integrated intensities corresponding to these ranges and interpolates that ratio with a correlating function to obtain the measurement of the property of interest.
Inventors
- 👤 Richard H. Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:50
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/65
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
92 words
A method for determining properties of a sample associated with the distribution of hydrocarbons in the sample comprising the steps of: irradiating a sample to produce a Raman spectrum of electromagnetic radiation which has been scattered as a result of irradiation; selecting at least a first range and a second, substantially non-overlapping, range in said spectrum, each of said ranges spanning more than one spectral peak; summing intensity values of said scattered radiation within each of said ranges; and comparing said values to provide a measurement of said properties of a sample.
Claim 2
Independent Claim
92 words
A method for determining properties of a sample associated with the distribution of hydrocarbons in the sample comprising the steps of: irradiating a sample to produce a Raman spectrum of electromagnetic radiation which has been scattered as a result of irradiation; selecting at least a first range and a second, substantially non-overlapping, range in said spectrum, each of said ranges spanning more than one spectral peak; summing intensity values of said scattered radiation within each of said ranges; and comparing said values to provide a measurement of said properties of a sample.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the method further comprises the step of acquiring said spectral ranges at a low resolution.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the method further comprises the step of irradiating the sample with a continuous wave laser source to obtain said spectrum.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the method further comprises the step of confining said spectrum to wavelengths between about 200 and about 4000 wavenumbers (cm -1 ).
Claim 6
Dependent Claim
48 words
The method of claim 1 wherein the method further comprises the step of choosing a selected wavelength according to a particular property that is to be measured and then defining said first range to lie above said wavelength, and defining said second range to lie below said wavelength.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the method further comprises the step of forming a ratio of said summed intensity values.
Claim 8
Dependent Claim
25 words
The method of claim 6 wherein the method further comprises the steps of comparing said ratio with a known value indicative of a sample property.
Claim 9
Dependent Claim
25 words
The method of claim 7 wherein the step of comparing values further comprises forming a linear correlating function from said ratios and said known values.
Claim 10
Dependent Claim
36 words
The method of claim 8, wherein the step of forming a correlation function further comprises the step of interpolating said ratio of said sample having an unknown value of said property with said linear correlating function.
Claim 11
Independent Claim
101 words
An apparatus for measuring a property of a sample associated with the distribution of hydrocarbons in the sample, the apparatus comprising: means for irradiating a sample to produce a Raman spectrum of electromagnetic radiation which has been scattered as a result of irradiation; means for selecting at least a first range and a second, substantially non-overlapping, range in said spectrum, each of said ranges spanning more than one spectral peak; means for summing intensity values of said scattered radiation within each of said ranges; and means for applying said summed values to provide a measurement of the property of a sample.
Claim 12
Independent Claim
101 words
An apparatus for measuring a property of a sample associated with the distribution of hydrocarbons in the sample, the apparatus comprising: means for irradiating a sample to produce a Raman spectrum of electromagnetic radiation which has been scattered as a result of irradiation; means for selecting at least a first range and a second, substantially non-overlapping, range in said spectrum, each of said ranges spanning more than one spectral peak; means for summing intensity values of said scattered radiation within each of said ranges; and means for applying said summed values to provide a measurement of the property of a sample.
Claim 13
Dependent Claim
23 words
The apparatus of claim 10 wherein said sample is irradiated by continuous wave laser means with power ranging between 100 and 500 milliwatts.
Claim 14
Dependent Claim
14 words
The apparatus of claim 10 wherein said spectral ranges are obtained by a photodetector.
Claim 15
Dependent Claim
20 words
The apparatus of claim 10 wherein the means for identifying said ranges further comprises at least two different filter elements.
Claim 16
Dependent Claim
27 words
The apparatus of claim 10 wherein the means for identifying said ranges further comprises a light dispersive element which cooperates with a spatial array of detector elements.
Claim 17
Dependent Claim
18 words
The apparatus of claim 10 wherein the apparatus further includes a sample chamber adapted to receive a sample.
Claim 18
Dependent Claim
16 words
The apparatus of claim 15 wherein the sample chamber further includes at least one porous wall.
Claim 19
Dependent Claim
17 words
The apparatus of claim 10 wherein the means for applying said summed values further comprises a microprocessor.
Claim 20
Dependent Claim
34 words
The apparatus of claim 10 wherein the means for applying said summed values further comprises means for defining a ratio of the summed values within one range to the summed values within another range.
Claim 21
Dependent Claim
25 words
The apparatus of claim 18 wherein the apparatus further comprises means for comparing said ratio with known values associated with a property to be measured.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |