US3572937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for interferometric measurement of machine slide roll
Assignee: United States Atomic Energy Commission
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Filing: 1968-11-04
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Granted: 1971-03-30
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Expires: 1988-11-04
Abstract
Abstract A method and apparatus for interferometric measurement of machine slide roll has been provided wherein split beams from a laser mounted on a machine bed are intersected to generate a fringe pattern extending along and normal to an axis which is parallel to the axis of a machine slide. A light-transmitting hologram previously provided with a similar fringe pattern is mounted to the slide and is oriented relative to the generated pattern so as to transmit light characterized by a ''''no-roll'''' Moire fringe pattern. Any roll of the machine slide rotates the hologram, producing a proportional change in the ''''no-roll'''' Moire fringe spacing.
Inventors
- 👤 Richard R Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:10
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02; G01B9/021; G01D; G01D5/00; G01D5/26; G01D5/266
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
171 words
A method of measuring the roll of an object moving relative to another object, comprising the steps of: providing first and second mutually coherent light beams directed to intersect so as to generate a fringe pattern extending along and normal to an axis parallel to the axis of movement of one of said objects; providing a light-transmitting member having a prerecorded fringe pattern thereon similar to said generated fringe pattern; attaching said light-transmitting member to the other object in a position normal to the axis of said intersecting light beams so as to provide a ''''no-roll'''' Moire fringe pattern; adjusting the angle of intersection of said first and second light beams so as to cause said Moire fringe pattern to incline in a direction corresponding to the direction of angular displacement of said light transmitting member relative to said intersecting light beams; and observing said Moire fringe pattern as said objects are moved relative to each other to detect changes in the inclination of said Moire fringe pattern thereby indicating roll.
Claim 2
Independent Claim
171 words
A method of measuring the roll of an object moving relative to another object, comprising the steps of: providing first and second mutually coherent light beams directed to intersect so as to generate a fringe pattern extending along and normal to an axis parallel to the axis of movement of one of said objects; providing a light-transmitting member having a prerecorded fringe pattern thereon similar to said generated fringe pattern; attaching said light-transmitting member to the other object in a position normal to the axis of said intersecting light beams so as to provide a ''''no-roll'''' Moire fringe pattern; adjusting the angle of intersection of said first and second light beams so as to cause said Moire fringe pattern to incline in a direction corresponding to the direction of angular displacement of said light transmitting member relative to said intersecting light beams; and observing said Moire fringe pattern as said objects are moved relative to each other to detect changes in the inclination of said Moire fringe pattern thereby indicating roll.
Claim 3
Independent Claim
125 words
A device for measuring roll of a slide member relative to a slide way, comprising: a coherent light source; means for splitting a beam from said light source into two segments and to intersect so as to generate a fringe pattern extending along and normal to an axis parallel to the axis of said slide way; and a light-transmitting member having a prerecorded fringe pattern thereon similar to said generated fringe pattern, said light-transmitting member being mounted on said slide member and oriented in a plane normal to said axis of said generated fringe pattern so as to provide a Moire reference fringe pattern which inclines in the direction of roll of said slide member as said slide member is moved along said slide way.
Claim 4
Independent Claim
125 words
A device for measuring roll of a slide member relative to a slide way, comprising: a coherent light source; means for splitting a beam from said light source into two segments and to intersect so as to generate a fringe pattern extending along and normal to an axis parallel to the axis of said slide way; and a light-transmitting member having a prerecorded fringe pattern thereon similar to said generated fringe pattern, said light-transmitting member being mounted on said slide member and oriented in a plane normal to said axis of said generated fringe pattern so as to provide a Moire reference fringe pattern which inclines in the direction of roll of said slide member as said slide member is moved along said slide way.
Claim 5
Dependent Claim
20 words
A device as set forth in claim 2 wherein said light source includes a laser and a light beam collimator.
Claim 6
Dependent Claim
25 words
A device as set forth in claim 3 wherein said light-transmitting member is a hologram having a transmitting face wherefrom said Moire fringe pattern emerges.
Claim 7
Dependent Claim
82 words
A device as set forth in claim 4 wherein said means for splitting and directing the light source beam comprises a beam divider, said beam divider being positioned to intercept the light beam from said collimator so that light incident upon said beam divider is part reflected and part transmitted therethrough, a reflector positioned to intercept said reflected portion of the light beam and reflect the beam so as to intersect said transmitted portion of the light beam at a predetermined angle.
Claim 8
Dependent Claim
64 words
A device as set forth in claim 5 further including an optical assembly positioned for viewing said Moire fringe pattern, said assembly comprising an eyepiece, first and second prisms interposed between said eyepiece and the transmitting face of said Hologram to intercept the top and bottom portions of said Moire fringe pattern, respectively, so as to generate a split fringe pattern at said eyepiece.
Claim 9
Dependent Claim
26 words
A device as set forth in claim 6 wherein each of said first and second prisms includes first and second porro prisms mounted base to base.
References Cited (Backward Citations)
US583243A
Cited
US3419898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |