US4020695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measurement of surface temperature
Assignee: Jones and Laughlin Steel Inc
•
Filing: 1976-01-07
•
Granted: 1977-05-03
•
Expires: 1996-01-07
Abstract
Abstract The temperature of a metal surface is measured by positioning a radiation detector so that the angle between its optical axis and a line normal to the surface is equal to the principal angle of incidence of the radiation emitted by the surface and interposing a polarizer between surface and radiation detector adjusted to pass only radiation polarized parallel to the plane of emittance. In this way the effects of emissivity variations of the surface are greatly reduced.
Inventors
- 👤 John E. Roney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
97 words
Pyrometer apparatus for metal surfaces comprising radiation detecting means responsive to a band of wave lengths from the radiation emitted by the surface, polarizing means interposed between the radiation detecting means and the surface, adjusted to selectively pass only radiation polarized parallel to the plane of emittance, and to suppress other radiation, the polarizing means being fixed in their place, and means for positioning the radiation detecting means so that the angle between its optical axis and a line normal to the surface is equal to the principal angle of incidence of the band of wave lengths.
Claim 2
Dependent Claim
97 words
Pyrometer apparatus for metal surfaces comprising radiation detecting means responsive to a band of wave lengths from the radiation emitted by the surface, polarizing means interposed between the radiation detecting means and the surface, adjusted to selectively pass only radiation polarized parallel to the plane of emittance, and to suppress other radiation, the polarizing means being fixed in their place, and means for positioning the radiation detecting means so that the angle between its optical axis and a line normal to the surface is equal to the principal angle of incidence of the band of wave lengths.
Claim 3
Independent Claim
87 words
The method of measuring the temperature of a radiating metal surface comprising polarizing radiation from the surface so as to produce a component parallel to the plane of emittance, and to suppress other radiation, maintaining constant the plane of polarization, and positioning a radiation detector so as to receive polarized radiation in the band of wave lengths to which the radiation detector responds emitted at an angle to a line normal to the surface equal to the principal angle of incidence of the band of wave lengths.
Claim 4
Independent Claim
87 words
The method of measuring the temperature of a radiating metal surface comprising polarizing radiation from the surface so as to produce a component parallel to the plane of emittance, and to suppress other radiation, maintaining constant the plane of polarization, and positioning a radiation detector so as to receive polarized radiation in the band of wave lengths to which the radiation detector responds emitted at an angle to a line normal to the surface equal to the principal angle of incidence of the band of wave lengths.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |