US4629322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material analysis using reflected light
Assignee: United States Department of the Army
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Filing: 1984-10-29
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Granted: 1986-12-16
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Expires: 2004-10-29
Abstract
Abstract An apparatus and method for determining the relative proportions of two eents of a ternary compound from light reflected off a sample of the compound. The light is varied in wavelength and a graph of reflectance vs wavelength is stored. For a given compound of general form A x B 1-x C, x may be determined by converting the stored graph to a graph of reflectance vs photon energy of the light, determining the photon energy of the light for the longest wavelength peak on the converted graph, and computing x from the equation E 1 =a+bx+cx 2 wherein a, b, and c are predetermined constants, and E 1 is the photon energy in electron volts of the peak of interest.
Inventors
- 👤 John H. Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/42; G01J2003/2859; G01J2003/425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A method for quantitively dry testing a sample of ternary compound of the form A x B 1-x C which includes the steps of: directing a variable wavelength light beam onto a surface of said compound; varying the wavelength of said light beam in a predetermined manner; detecting the reflectance of light from said surface as said wavelength is varied and plotting a graph thereof; replotting said graph as a graph of reflectance versus photon energy of the light; and determining the longest wavelength peak of said reflectance versus photon energy graph whereby the photon energy of said longest wavelength is designated E 1 ; and computing x from the equation E 1 =a+bx+cx 2 , wherein a, b, and c are predetermined constants for the compound.
Claim 2
Independent Claim
127 words
A method for quantitively dry testing a sample of ternary compound of the form A x B 1-x C which includes the steps of: directing a variable wavelength light beam onto a surface of said compound; varying the wavelength of said light beam in a predetermined manner; detecting the reflectance of light from said surface as said wavelength is varied and plotting a graph thereof; replotting said graph as a graph of reflectance versus photon energy of the light; and determining the longest wavelength peak of said reflectance versus photon energy graph whereby the photon energy of said longest wavelength is designated E 1 ; and computing x from the equation E 1 =a+bx+cx 2 , wherein a, b, and c are predetermined constants for the compound.
References Cited (Backward Citations)
US4142802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |