US4482250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for identifying timber surface properties
Assignee: Altim Control Oy
•
Filing: 1981-12-24
•
Granted: 1984-11-13
•
Expires: 2001-12-24
Abstract
Abstract A method for identifying timber surface properties by using linearly polarized light. The polarization plane of the incident radiation is selected according to the object. The intensity components I min and I max having perpendicular polarization planes of the scattered radiation are measured, where the polarization plane of the component I max is the same as that of the incident radiation. On the basis of the quantities I min and ##EQU1## conclusions are drawn about the surface properties of the examined surface.
Inventors
- 👤 Kullervo Hirvonen
- 👤 Aimo Karonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:22
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/898; G01N21/8986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
A method for determining timber surface properties, characterized in that substantially monochromatic, electromagnetical, linearly polarized radiation of the optical wavelength range is directed to the surface so that (a) the polarization plane of the radiation coming to the surface is either parallel to the growth direction of the wood or perpendicular to it, (b) the intensity components I min and I max having polarization planes of scattered radiation perpendicular to each other, are detected, wherein the polarization plane of the component I max is the same as the polarization plane of the incident radiation, (c) the quantities I min and ##EQU4## are both used in determining the quality of the surface and further characterized in that the incoming direction of the incident radiation and measuring direction of the scattered radiation deviate from the direction perpendicular to the surface about 15° at the most when measured in a plane parallel to the longitudinal growth direction of the wood and about 50° at the most when measured in a plane perpendicular to the longitudinal growth direction of the wood.
Claim 2
Independent Claim
177 words
A method for determining timber surface properties, characterized in that substantially monochromatic, electromagnetical, linearly polarized radiation of the optical wavelength range is directed to the surface so that (a) the polarization plane of the radiation coming to the surface is either parallel to the growth direction of the wood or perpendicular to it, (b) the intensity components I min and I max having polarization planes of scattered radiation perpendicular to each other, are detected, wherein the polarization plane of the component I max is the same as the polarization plane of the incident radiation, (c) the quantities I min and ##EQU4## are both used in determining the quality of the surface and further characterized in that the incoming direction of the incident radiation and measuring direction of the scattered radiation deviate from the direction perpendicular to the surface about 15° at the most when measured in a plane parallel to the longitudinal growth direction of the wood and about 50° at the most when measured in a plane perpendicular to the longitudinal growth direction of the wood.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |