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 Title: |
US5428446:
Measurement instrument with interferometer and method
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Ziegert, John C.; Palm Beach Gardens, FL 33410
Mize, Christopher D.; Palm Beach Gardens, FL 33410
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| Assignee: |
None
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| Published / Filed: |
1995-06-27
/ 1994-07-11
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| Application Number: |
US1994000364740
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| IPC Code: |
Advanced:
G01B 11/00;
G01B 21/04;
Core:
G01B 21/02;
more...
IPC-7:
G01B 9/02;
G01B 9/06;
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| ECLA Code: |
G01B11/00D; G01B21/04D;
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| U.S. Class: |
Current:
356/493;
250/231.11;
250/315.3;
356/498;
Original:
356/358;
356/345;
356/357;
250/315.3;
250/231.11;
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| Field of Search: |
356/345,357,358
250/237 G,315.3,231.11
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| Priority Number: |
| 1994-07-11 |
US1994000364740 |
| 1993-03-29 |
US1993000038793 |
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| Abstract: |
A ball bar gage for obtaining the accuracy of numerical control machines and the like including telescoping means integrated with an interferometer and the method of measuring the distances between two locations including an initialization process that ascertains the absolute length of the distance being measured from the differential changes in length measured by the interferometer and a computer that calculates by a trilateration computation 2 or 3 dimensional coordinates by computing the measurements obtained by the ball bar gage. A laser beam or other light source are contemplated to energize the interferometer. Similar calculations are performed with the ball bar gage and computer over a number of spatial locations commensurate with determining the accuracy of the machine being evaluated.
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| Attorney, Agent or Firm: |
Friedland, Norman ;
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| Primary / Asst. Examiners: |
Limanek, Robert P.; Williams, Alexander Oscar
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| Maintenance Status: |
E3 Expired Check current status
CC Certificate of Correction issued
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| INPADOC Legal Status: |
Show legal status actions
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| Parent Case: |
This application is a continuation of Ser. No. 08/038,793, filed Mar. 29, 1993, now abandoned.
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| Family: |
None
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First Claim:
Show all 23 claims |
We claim:
1. A measurement instrument for determining coordinates of points in three dimensional space and which may be used to determine the spatial positioning accuracy of machines, which comprises,
- a telescoping assembly which permits relative rectilinear extension and retraction of the two ends of the instrument,
- a pair of linearly opposed fittings attached to each end of said telescoping assembly,
- a pair of complementary fittings to be attached to suitable points on the machine being measured and which cooperate with the fittings on the ends of the telescoping assembly to permit unrestricted rotational motion about a fixed point on the bodies to which each fitting is attached,
- an interferometer apparatus mounted on said telescoping assembly having means for generating a signal indicative of the change in length of said telescoping assembly,
- a reflective means on said telescoping assembly for reflecting a beam of light from a point near one end of the telescoping assembly to a point near the opposite end of the telescoping assembly,
- a source of light,
- an omni-directional means for transmitting said light from said source to a point on said telescoping apparatus,
- a receiver/computer which is responsive to the output signal of said interferometer to calculate the change in length of said telescoping apparatus,
- an omni directional means for collecting the signal generated by said interferometer and delivering it to said receiver/computer.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 17 U.S. patent(s) that reference this one
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