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US3170982A
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Method of measuring by interference
Assignee: General Precision Inc
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Filing: 1962-05-04
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Granted: 1965-02-23
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Harold S Hemstreet
- 👤 Robert A Woodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:50
CPC Classifications
G; G01; G01B; G01B9/00; G01B9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
A METHOD OF MEASURING ANGLE ERROR IN A REFLECTIVE MEMBER INCLUDING THREE ESSENIALLY MUTUALLY PERPENDICULAR REFLECTING SURFACES, SAID REFLECTIVE MEMBER EXHIBITING SIX KITE APERTURES, COMPRISING THE STEPS OF PASSING TWO COHERENT PARALLEL INCIDENT LIGHT BEAMS THROUGH THE REFLECTIVE MEMBER IN THREE SUCCESSIVE ORIENTATIONS IN OPPOSING DIRECTIONS AND COMBINING THE TWO REFLECTED BEAMS IN SUCH A MANNER THAT THE PATH LENGTH OF EACH OF THE TWO LIGHT BEAMS PRIOR TO COMBINATION ARE EQUAL, SAID COMBINED BEAM CONTAINING A FRINGE PATTERN FOR EACH ORIENTATION COMMENSURATE WITH THE ANGLE ERROR OF THE REFLECTIVE MEMBER FOR THAT ORIENTATION, THE FIRST ORIENTATION OF THE REFLECTIVE MEMBER BEING SUCH THAT THE TWO LIGHT BEAMS IMPINGE ON A FIRST SAID KITE APERTURE, ROTATING THE REFLECTIVE MEMBER BY 60 DEGREES IN EITHER DIRECTION ABOUT ITS APEX TO POSITION SAID REFLECTIVE MEMBER IN A SECOND ORIENTATION SUCH THAT THE TWO INCIDENT LIGHT BEAMS IMPINGE ON A SECOND OF SAID KITE APERTURES, ROTATING THE REFLECTIVE MEMBER BY 120 DEGREES IN EITHER DIRECTION FROM ITS FIRST ORIENTATION ABOUT ITS APEX TO POSITION SAID REFLECTIVE MEMBER IN A THIRD ORIENTATION SUCH THAT THE TWO PARALLEL INCIDENT LIGHT BEAMS IMPINGE ON STILL ANOTHER KITE APERTURE, THE THREE FRINGE PATTERNS OBSERVED IN THE RECOMBINED BEAM FOR THE THREE ORIENTATIONS OF THE REFLECTIVE MEMBER BEING COMPLETELY DETERMINATIVE OF THE ANGLE ERROR IN THE REFLECTIVE MEMBER.
Claim 2
Independent Claim
220 words
A METHOD OF MEASURING ANGLE ERROR IN A REFLECTIVE MEMBER INCLUDING THREE ESSENIALLY MUTUALLY PERPENDICULAR REFLECTING SURFACES, SAID REFLECTIVE MEMBER EXHIBITING SIX KITE APERTURES, COMPRISING THE STEPS OF PASSING TWO COHERENT PARALLEL INCIDENT LIGHT BEAMS THROUGH THE REFLECTIVE MEMBER IN THREE SUCCESSIVE ORIENTATIONS IN OPPOSING DIRECTIONS AND COMBINING THE TWO REFLECTED BEAMS IN SUCH A MANNER THAT THE PATH LENGTH OF EACH OF THE TWO LIGHT BEAMS PRIOR TO COMBINATION ARE EQUAL, SAID COMBINED BEAM CONTAINING A FRINGE PATTERN FOR EACH ORIENTATION COMMENSURATE WITH THE ANGLE ERROR OF THE REFLECTIVE MEMBER FOR THAT ORIENTATION, THE FIRST ORIENTATION OF THE REFLECTIVE MEMBER BEING SUCH THAT THE TWO LIGHT BEAMS IMPINGE ON A FIRST SAID KITE APERTURE, ROTATING THE REFLECTIVE MEMBER BY 60 DEGREES IN EITHER DIRECTION ABOUT ITS APEX TO POSITION SAID REFLECTIVE MEMBER IN A SECOND ORIENTATION SUCH THAT THE TWO INCIDENT LIGHT BEAMS IMPINGE ON A SECOND OF SAID KITE APERTURES, ROTATING THE REFLECTIVE MEMBER BY 120 DEGREES IN EITHER DIRECTION FROM ITS FIRST ORIENTATION ABOUT ITS APEX TO POSITION SAID REFLECTIVE MEMBER IN A THIRD ORIENTATION SUCH THAT THE TWO PARALLEL INCIDENT LIGHT BEAMS IMPINGE ON STILL ANOTHER KITE APERTURE, THE THREE FRINGE PATTERNS OBSERVED IN THE RECOMBINED BEAM FOR THE THREE ORIENTATIONS OF THE REFLECTIVE MEMBER BEING COMPLETELY DETERMINATIVE OF THE ANGLE ERROR IN THE REFLECTIVE MEMBER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |