Patent US3817628A successfully refreshed from Google Patents.
US3817628A
Expired / Lapsed
US
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Reflectometer for on-line analysis of granular powders
Assignee: F Hoffmann La Roche AG
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Filing: 1972-08-17
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Granted: 1974-06-18
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Expires: 1992-08-17
Abstract
Abstract A method and apparatus for analyzing visible reflectance data of a granular crystalline powder sample in a solid state relative to reflectance data for a reference specimen, by minimizing the effects of the powder particle size on the measurement of the sample optical properties comprising, an optical assembly for deriving sample reference reflectance data, effecting standardization of the sample reflectance data relative to the reference reflectance data by a ratio comparison, and processing the standardized signals effected to establish an output indicator signal representative of the sample optical properties for ascertaining the degrees of presence/absence of the optical quality to be measured.
Inventors
- 👤 J Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:11
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A method for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powder sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: deriving electrical signals indicative of sample and reference specimen reflectance at first and second wavelength regions which are respectively sensitive and insensitive to a change in the sample optical properties to be determined; effecting a ratio-comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and generating an output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample''s optical properties unaffected by particle size.
Claim 2
Independent Claim
132 words
A method for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powder sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: deriving electrical signals indicative of sample and reference specimen reflectance at first and second wavelength regions which are respectively sensitive and insensitive to a change in the sample optical properties to be determined; effecting a ratio-comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and generating an output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample''s optical properties unaffected by particle size.
Claim 3
Independent Claim
143 words
A method for analyzing visible reflectance data of a granular crystalline powder sample in a solid state relative to reference reflectance data for minimizing the effects of the powder particle size on measurement of the sample optical properties comprising: deriving electrical signals indicative of sample and reference specimen reflectance data for a first, second and third wavelength regions, the first and third sensitive to and the second insensitive to the sample optical quality to be monitored; effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and, relating the standardized signals to each other by first averaging the standardized signals of the first and third wavelength regions, and then detecting the difference between the standardized signal at the second wavelength and said averaged standardized signals to provide a first indicator signal.
Claim 4
Independent Claim
143 words
A method for analyzing visible reflectance data of a granular crystalline powder sample in a solid state relative to reference reflectance data for minimizing the effects of the powder particle size on measurement of the sample optical properties comprising: deriving electrical signals indicative of sample and reference specimen reflectance data for a first, second and third wavelength regions, the first and third sensitive to and the second insensitive to the sample optical quality to be monitored; effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and, relating the standardized signals to each other by first averaging the standardized signals of the first and third wavelength regions, and then detecting the difference between the standardized signal at the second wavelength and said averaged standardized signals to provide a first indicator signal.
Claim 5
Dependent Claim
33 words
A method according to claim 2 whereby said relating the standardized signals includes detecting the difference between the standardized signals at the first and second wavelength regions to provide a second indicator signal.
Claim 6
Dependent Claim
25 words
A method according to claim 3 including averaging the standardized signals at the first, second and third wavelength regions to provide a third indicator signal.
Claim 7
Dependent Claim
141 words
Apparatus for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powdEr sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: optical assembly means for deriving electrical signals indicative of sample and reference specimen reflectance at first and second wavelength regions which are respectively sensitive and insensitive to a change in the sample optical properties to be determined; means for effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and logic means for generating an output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample optical properties unaffected by particle size.
Claim 8
Dependent Claim
141 words
Apparatus for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powdEr sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: optical assembly means for deriving electrical signals indicative of sample and reference specimen reflectance at first and second wavelength regions which are respectively sensitive and insensitive to a change in the sample optical properties to be determined; means for effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and logic means for generating an output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample optical properties unaffected by particle size.
Claim 9
Dependent Claim
202 words
Apparatus for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powder sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: optical assembly means for deriving electrical signals indicative of sample and reference specimen reflectance at first, second and third wavelength regions the first and third sensitive to and the second insensitive to a change in the sample optical properties to be determined; means for effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and, logic means which comprises means for generating a first output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample''s optical properties unaffected by particle size, means for averaging the standardized signals at the first and third wavelength regions, means for generating a second output indicator signal which comprises the difference between the standardized signal at the second wavelength region and said averaged standardized signals which are also representative of the sample''s optical properties unaffected by particle size.
Claim 10
Dependent Claim
202 words
Apparatus for determining the optical properties of a granular crystalline powder sample by measuring the reflectance of said granular crystalline powder sample in a solid state relative to the reflectance of a reference whereby the effect of the powder particle size on such determination is minimized comprising: optical assembly means for deriving electrical signals indicative of sample and reference specimen reflectance at first, second and third wavelength regions the first and third sensitive to and the second insensitive to a change in the sample optical properties to be determined; means for effecting a ratio comparison of the sample signal to the reference signal at each of the wavelengths to provide distinct standardized signals; and, logic means which comprises means for generating a first output indicator signal comprising the difference in standardized signals at first and second wavelength regions which is representative of the sample''s optical properties unaffected by particle size, means for averaging the standardized signals at the first and third wavelength regions, means for generating a second output indicator signal which comprises the difference between the standardized signal at the second wavelength region and said averaged standardized signals which are also representative of the sample''s optical properties unaffected by particle size.
Claim 11
Dependent Claim
37 words
Apparatus according to claim 6 whereby said logic means further includes means for averaging the standardized signals at the first, second and third wavelength regions to provide a third indicator signal representative of the sample optical properties.
References Cited (Backward Citations)
US3328587A
Cited
US3679314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |