Patent DE712110C successfully refreshed from Google Patents.
Patent US4072425A successfully refreshed from Google Patents.
US4072425A
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US
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Method of indicating the relative roughness of a surface
Assignee: United States Department of the Army
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Filing: 1976-08-09
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Granted: 1978-02-07
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Expires: 1996-08-09
Abstract
Abstract The relative roughness of a surface, finished with a plurality of uniform rallel grooves, is indicated in a method wherein (a) a focused beam of light is directed normal to the surface, (b) a light-sensitive device is disposed to one side of the beam to receive reflected light of the beam from the surface, (c) relative motion is provided between the beam and the surface, and (d) the energy of the reflected light received by the light-sensitive device is converted to a visual display whose amplitude is a function of the roughness of the surface.
Inventors
- 👤 Thomas Guttman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:25
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/30; G01B11/303
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A method of indicating the relative roughness of a surface finished with a plurality of substantially uniform parallel grooves, said method comprising the steps of: directing an incident beam of light substantially perpendicularly to said surface, interrupting said incident beam periodically, focusing said beam so that its width at said surface is substantially that of the narrowest groove that represents the least roughness to be indicated, providing a light-sensitive device disposed laterally of said beam to received reflected light of said beam from said surface, providing relative motion between said surface and said beam in a direction substantially perpendicular to the direction of said grooves, and converting the energy of said reflected light received by said device to a visual display, whereby to indicate the relative roughness of said surface.
Claim 2
Independent Claim
130 words
A method of indicating the relative roughness of a surface finished with a plurality of substantially uniform parallel grooves, said method comprising the steps of: directing an incident beam of light substantially perpendicularly to said surface, interrupting said incident beam periodically, focusing said beam so that its width at said surface is substantially that of the narrowest groove that represents the least roughness to be indicated, providing a light-sensitive device disposed laterally of said beam to received reflected light of said beam from said surface, providing relative motion between said surface and said beam in a direction substantially perpendicular to the direction of said grooves, and converting the energy of said reflected light received by said device to a visual display, whereby to indicate the relative roughness of said surface.
Claim 3
Dependent Claim
28 words
A method of indicating the relative roughness of a surface as described in claim 1, including the additional step of: focusing said reflected light onto said light-sensitive device.
Claim 4
Dependent Claim
33 words
A method of indicating the relative roughness of a surface as described in claim 1, wherein: said surface is finished with a milling maching, whereby to provide said substantially uniform parallel grooves therein.
Claim 5
Dependent Claim
26 words
A method of indicating the relative roughness of a surface as described in claim 1, wherein: said beam of light is provided by a laser-beam source.
Claim 6
Dependent Claim
35 words
A method of indicating the relative roughness of a surface as described in claim 1, wherein: the step of focusing said beam comprises disposing an adjustable optical system in the path of said incident beam.
Claim 7
Dependent Claim
57 words
A method of indicating the relative roughness of a surface as described in claim 1, wherein: the step of providing a light-sensitive device disposed to receive reflected light of said beam from said surface comprises placing said device at a fixed distance from the source of said incident beam and to one side of said incident beam.
Claim 8
Dependent Claim
50 words
A method of indicating the relative roughness of a surface as described in claim 1, wherein: the step of providing relative motion between said surface and said beam comprises moving said surface in a direction transversely to the direction of said grooves while maintaining said beam and said device stationary.
Claim 9
Dependent Claim
62 words
The method of indicating the relative roughness of a surface as described in claim 1, wherein: the step of converting the energy of said reflected light received by said device to a visual display comprises connecting said device in an electrical circuit to convert said energy to a voltage, and providing said circuit with means to indicate the amplitude of said voltage.
Claim 10
Dependent Claim
28 words
The method of indicating the relative roughness of a surface, as indicated in claim 8, wherein said means to indicate the amplitude of said voltage is an oscilloscope.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |