US3639758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray stress measuring apparatus
Assignee: Rigaku Denki Co Ltd
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Filing: 1970-02-03
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Granted: 1972-02-01
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Expires: 1990-02-03
Abstract
Abstract The present invention provides an X-ray stress measuring apparatus wherein two X-ray detectors are simultaneously movable on a circular arc about the incident point of X-rays from an Xray tube in a plane including said incident point and two targets.
Inventors
- 👤 Yoshihiro Shimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:13
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/20; G01N23/207
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
An X-ray stress measuring apparatus comprising a hot cathode arranged in the center of an X-ray tube, at least two X-ray generating targets opposed to said cathode and arranged on the inside surfaces of said tube, said targets applying X-rays to the surface of a specimen on the same position at 90* and at any other desired angle; two X-ray detectors arranged outside said targets, means for moving each of said X-ray detectors symmetrically in relation to the X-ray tube, a register for recording the relationship between the displacement angle of each detector and the output thereof, whereby the internal stress of a specimen in the direction of the intersection of the specimen surface with a plane including the two X-ray beams can be estimated from the difference between the displacement angles at which peak outputs are obtained from the two detectorS.
Claim 2
Dependent Claim
142 words
An X-ray stress measuring apparatus comprising a hot cathode arranged in the center of an X-ray tube, at least two X-ray generating targets opposed to said cathode and arranged on the inside surfaces of said tube, said targets applying X-rays to the surface of a specimen on the same position at 90* and at any other desired angle; two X-ray detectors arranged outside said targets, means for moving each of said X-ray detectors symmetrically in relation to the X-ray tube, a register for recording the relationship between the displacement angle of each detector and the output thereof, whereby the internal stress of a specimen in the direction of the intersection of the specimen surface with a plane including the two X-ray beams can be estimated from the difference between the displacement angles at which peak outputs are obtained from the two detectorS.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein said X-ray tube has a sector-shaped tubular head and said targets are arranged on the inside surfaces of the sector walls of said tubular head.
Claim 4
Dependent Claim
16 words
The apparatus of claim 2 wherein said tubular head includes a baseplate for mounting said detectors.
Claim 5
Dependent Claim
24 words
The apparatus of claim 3 wherein the outer periphery of the baseplate forms a circular arc-shaped guideway and said detectors are slidably mounted thereon.
Claim 6
Dependent Claim
21 words
The apparatus of claim 1 wherein said cathode comprises a rectangular box-shaped control grid and two hot filaments in said grid.
Claim 7
Dependent Claim
11 words
The apparatus of claim 5 wherein said filaments are selectively heated.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |