US4662745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflectance and luminescence calibration plate having a near-Lambertian surface and method for making the same
Assignee: Atlantic Richfield Co
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Filing: 1986-02-05
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Granted: 1987-05-05
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Expires: 2006-02-05
Abstract
Abstract In order to provide an calibration plate having both known reflectance and known luminescence characteristics for calibrating and proving a radiometer, which calibration plate exhibits a near-Lambertian surface reflectance, a ceramic or glass coating containing a rare earth photoluminescent material is bonded to a surface of a rigid substrate, such as a steel plate, and the ceramic coating is thereafter sandblasted with a fine abrasive in good condition.
Inventors
- 👤 Joseph E. Zupanick
- 👤 Robert G. Maynard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:09
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274; G01N21/278
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A method for making a calibration plate having a surface exhibiting a near-Lambertian reflectance characteristic and a determinable and constant photoluminescent characteristic comprising the steps of: (A) selecting a fusible substance which, after fusion and cooling, produces a brittle structure; (B) adding to the fusible substance, a photoluminescent ingredient comprising a rare earth element selected from the group including: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutecium to provide a fusible mixture; (C) applying the fusible mixture as a coating to a surface of a rigid substrate; (D) firing the coated rigid substrate; (E) cooling the fired coated rigid substrate; and (F) sandblasting the outer surface of the fired coating employing a fine abrasive which is in good condition.
Claim 2
Independent Claim
127 words
A method for making a calibration plate having a surface exhibiting a near-Lambertian reflectance characteristic and a determinable and constant photoluminescent characteristic comprising the steps of: (A) selecting a fusible substance which, after fusion and cooling, produces a brittle structure; (B) adding to the fusible substance, a photoluminescent ingredient comprising a rare earth element selected from the group including: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutecium to provide a fusible mixture; (C) applying the fusible mixture as a coating to a surface of a rigid substrate; (D) firing the coated rigid substrate; (E) cooling the fired coated rigid substrate; and (F) sandblasting the outer surface of the fired coating employing a fine abrasive which is in good condition.
Claim 3
Dependent Claim
29 words
The method of claim 1 in which the photoluminescent material is a rare earth compound selected from the group including: sulfates, chlorides, fluorides, acetates, nitrates, carbonates, oxalates and oxides.
Claim 4
Dependent Claim
28 words
The method of claim 2 in which the rigid substrate comprises a steel plate, the fusible substance comprises china clay and the rare earth compound is praseodymium acetate.
Claim 5
Dependent Claim
27 words
The medoum of claim 2 in which the rigid substrate comprises a steel plate, the fusible substance comprises glass and the rare earth compound is praseodymium oxide.
Claim 6
Dependent Claim
88 words
A calibration plate having a surface exhibiting a near-Lambertian reflectance characteristic and a determinable and constant photoluminescent characteristic comprising: (A) a rigid substrate; (B) a brittle coating overlaying a surface of said substrate, said brittle coating including a photoluminescent material comprising a rare earth element selected from the group including: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutecium; and (c) an outer surface of said brittle coating, which outer surface has been sandblasted using a fine abrasive in good condition.
Claim 7
Dependent Claim
88 words
A calibration plate having a surface exhibiting a near-Lambertian reflectance characteristic and a determinable and constant photoluminescent characteristic comprising: (A) a rigid substrate; (B) a brittle coating overlaying a surface of said substrate, said brittle coating including a photoluminescent material comprising a rare earth element selected from the group including: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutecium; and (c) an outer surface of said brittle coating, which outer surface has been sandblasted using a fine abrasive in good condition.
Claim 8
Dependent Claim
30 words
The calibration plate of claim 5 in which said photoluminescent material is a rare each compound selected from the group including: sulfates, chlorides, fluorides, acetates, nitrates, carbonates, oxalates and oxides.
Claim 9
Dependent Claim
28 words
The calibration plate of claim 6 in which said rigid substrate comprises a steel plate, said brittle coating comprises ceramic and said rare earth compound is praseodymium acetate.
Claim 10
Dependent Claim
28 words
The calibration plate of claim 6 in which said rigid substrate comprises a steel plate, said brittle coating comprises glass and said rare earth compound is praseodymium oxide.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |