US4893259A
Expired / Lapsed
US
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Standardization of spectral lines
Assignee: PerkinElmer Instruments LLC
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Filing: 1988-06-02
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Granted: 1990-01-09
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Expires: 2008-06-02
Abstract
Abstract A method and apparatus for standardizing spectral line intensities in a spectral monochromator separate an input beam into a sample spectral line characteristic of a sample element, a reference spectral line, a standard spectral line and a background spectral band. At a first point in time an intensity I A of the sample line, a first intensity I R1 of the reference line and a first intensity I B1 of the background band are measured. At a second point in time an intensity I S of the standard line, a second intensity I R2 of the reference line and a second intensity I B2 of the background band are measured. An intensity ratio IR defined by the formula ##EQU1## is computed wherein the intensity ratio IR represents a standardized intensity of the sample line compensated for source fluctuations.
Inventors
- 👤 Zoe A. Grosser
- 👤 John B. Collins
- 👤 Ewa M. Pruszkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:11
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J2003/2866; G01J2003/2869; G01J3/443
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
204 words
A method of standardizing spectral line intensities in an optical spectrometer including: radiation means for generating a spectral input beam characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, and a standard spectral line characteristic of the standard element; and measuring means for measuring intensity of each of the spectral lines; the method comprising: introducing into the radiation means a sample element, a reference element and a standard element such as to provide, respectively, a sample spectral line, a reference spectral line and a standard spectral line; measuring at a first time an intensity I A of the sample line and a first intensity I R1 of the reference line; measuring at a second time different than the first time an intensity I S of the standard line and a second intensity I R2 of the reference line; computing an intensity ratio IR O defined by the formula ##EQU9## wherein the intensity ratio IR O is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 2
Independent Claim
204 words
A method of standardizing spectral line intensities in an optical spectrometer including: radiation means for generating a spectral input beam characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, and a standard spectral line characteristic of the standard element; and measuring means for measuring intensity of each of the spectral lines; the method comprising: introducing into the radiation means a sample element, a reference element and a standard element such as to provide, respectively, a sample spectral line, a reference spectral line and a standard spectral line; measuring at a first time an intensity I A of the sample line and a first intensity I R1 of the reference line; measuring at a second time different than the first time an intensity I S of the standard line and a second intensity I R2 of the reference line; computing an intensity ratio IR O defined by the formula ##EQU9## wherein the intensity ratio IR O is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 3
Independent Claim
250 words
A method of standardizing spectral line intensities in an optical spectrometer including: radiation means for generating a spectral input beam having a background radiation and being characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, a standard spectral line characteristic of the standard element, and a background spectral band of the background radiation; and measuring means for measuring intensity of each of the spectral lines and the background band; the method comprising: introducing into the radiation means a sample element, a reference element and a standard element such as to provide in the spectrometer respectively, a sample spectral line, a reference spectral line and a standard spectral line and to further provide a background spectral band; measuring at a first time an intensity I A of the sample line, a first intensity I R1 of the reference line and a first intensity I B1 of the background band; measuring at a second time different than the first time an intensity I S of the standard line, a second intensity I R2 of the reference line and a second intensity I B2 of the background band; and computing an intensity ratio IR defined by the formula ##EQU10## wherein the intensity ratio IR is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 4
Independent Claim
250 words
A method of standardizing spectral line intensities in an optical spectrometer including: radiation means for generating a spectral input beam having a background radiation and being characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, a standard spectral line characteristic of the standard element, and a background spectral band of the background radiation; and measuring means for measuring intensity of each of the spectral lines and the background band; the method comprising: introducing into the radiation means a sample element, a reference element and a standard element such as to provide in the spectrometer respectively, a sample spectral line, a reference spectral line and a standard spectral line and to further provide a background spectral band; measuring at a first time an intensity I A of the sample line, a first intensity I R1 of the reference line and a first intensity I B1 of the background band; measuring at a second time different than the first time an intensity I S of the standard line, a second intensity I R2 of the reference line and a second intensity I B2 of the background band; and computing an intensity ratio IR defined by the formula ##EQU10## wherein the intensity ratio IR is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 5
Dependent Claim
72 words
The method according to claim 2 wherein the separating means comprises: splitting means for splitting the input beam into a primary beam characteristic of the sample element and the reference element, a standard beam comprising the standard spectral line and a background beam comprising the background spectral band; and optical dispersion means receptive of the primary beam for producing a series of spectral lines comprising the sample line and the reference line.
Claim 6
Dependent Claim
166 words
An optical spectrometer comprising: radiation means for generating a spectral input beam characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, and a standard spectral line characteristic of the standard element; first measuring means for measuring at a first time an intensity I A of the sample line and a first intensity I R1 of the reference line; second measuring means for measuring at a second time different than the first time an intensity I S of the standard line and a second intensity I R2 of the reference line; computing means responsive to the first and second measuring means for computing an intensity ratio IR defined by the formula ##EQU11## wherein the intensity ratio IR O is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 7
Dependent Claim
166 words
An optical spectrometer comprising: radiation means for generating a spectral input beam characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, and a standard spectral line characteristic of the standard element; first measuring means for measuring at a first time an intensity I A of the sample line and a first intensity I R1 of the reference line; second measuring means for measuring at a second time different than the first time an intensity I S of the standard line and a second intensity I R2 of the reference line; computing means responsive to the first and second measuring means for computing an intensity ratio IR defined by the formula ##EQU11## wherein the intensity ratio IR O is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 8
Dependent Claim
198 words
An optical spectrometer comprising: radiation means for generating a spectral input beam having a background radiation and being characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, a standard spectral line characteristic of the standard element, and a background spectral band of the background radiation; first measuring means for measuring at a first time an intensity I A of the sample line, a first intensity I R1 of the reference line and a first intensity I B1 of the background band; second measuring means for measuring at a second time different than the first time an intensity I S of the standard line, a second intensity I R2 of the reference line and a second intensity I B2 of the background band; and computing means responsive to the first and second measuring means for computing an intensity ratio IR defined by the formula ##EQU12## wherein the intensity ratio IR is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 9
Dependent Claim
198 words
An optical spectrometer comprising: radiation means for generating a spectral input beam having a background radiation and being characteristic of a plurality of atomic elements including a sample element, a reference element and a standard element; separation means for separating the input beam into a sample spectral line characteristic of the sample element, a reference spectral line characteristic of the reference element, a standard spectral line characteristic of the standard element, and a background spectral band of the background radiation; first measuring means for measuring at a first time an intensity I A of the sample line, a first intensity I R1 of the reference line and a first intensity I B1 of the background band; second measuring means for measuring at a second time different than the first time an intensity I S of the standard line, a second intensity I R2 of the reference line and a second intensity I B2 of the background band; and computing means responsive to the first and second measuring means for computing an intensity ratio IR defined by the formula ##EQU12## wherein the intensity ratio IR is representative of a standardized intensity of the sample line compensated for source fluctuations.
Claim 10
Dependent Claim
72 words
The spectrometer according to claim 5 wherein the separating means comprises: splitting means for splitting the input beam into a primary beam characteristic of the sample element and the reference element, a standard beam comprising the standard spectral line and a background beam comprising the background spectral band; and optical dispersion means receptive of the primary beam for producing a series of spectral lines comprising the sample line and the reference line.
Claim 11
Dependent Claim
63 words
The spectrometer according to claim 6 wherein the first measuring means comprises a first primary detector receptive of the sample line, a reference detector receptive of the reference line, and a background detector receptive of the background line, and the second measuring means comprises a second primary detector receptive of the standard line and further comprises the reference detector and the background detector.
Claim 12
Dependent Claim
17 words
The spectrometer according to claim 7 wherein the second primary detector consists of the first primary detector.
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |