Patent US4714825A successfully refreshed from Google Patents.
US4714825A
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System for calibrating the time axis of an X-ray streak tube
Assignee: Hamamatsu Photonics KK
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Filing: 1985-12-04
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Granted: 1987-12-22
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Expires: 2005-12-04
Abstract
Abstract A system for calibrating the time axis of an X-ray streak tube comprising a light source for generating a train of light pulses and an X-ray tube including a photocathode for receiving the light pulses. Upon receiving the light pulses, the X-ray tube generates a train of X-rays which excite the photocathode of the streak tube causing it to emit an electron beam. The electron beam is scanned by a sweep voltage synchronized with the light pulses and applied across deflection electrodes in the streak tube. The deflected beam impinges on the phosphor screen of the streak tube where the time interval of the streak image is measured.
Inventors
- 👤 Koichiro Oba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:21
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/065; H01J35/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
A system for calibrating the time axis of an X-ray streak tube, said streak tube including a first photocathode, deflection means and a phosphor surface, comprising: a light source for generating a train of light pulses, said light pulses being spaced by a predetermined interval of time; X-ray tube means including a second photocathode, focusing means and an X-ray target, said X-ray tube means generating a train of X-rays when said second photocathode is exposed to said light pulses; means for exposing said first photocathode of said streak tube to said train of X-rays, said first photocathode emitting an electron beam in response thereto; means for energizing the deflection means of said streak tube, the energizing of said deflection means being synchronized with said train of light pulses; and means for measuring the time interval of the streak image generated by said electron means on the phosphor surface of said X-ray streak tube.
Claim 2
Independent Claim
153 words
A system for calibrating the time axis of an X-ray streak tube, said streak tube including a first photocathode, deflection means and a phosphor surface, comprising: a light source for generating a train of light pulses, said light pulses being spaced by a predetermined interval of time; X-ray tube means including a second photocathode, focusing means and an X-ray target, said X-ray tube means generating a train of X-rays when said second photocathode is exposed to said light pulses; means for exposing said first photocathode of said streak tube to said train of X-rays, said first photocathode emitting an electron beam in response thereto; means for energizing the deflection means of said streak tube, the energizing of said deflection means being synchronized with said train of light pulses; and means for measuring the time interval of the streak image generated by said electron means on the phosphor surface of said X-ray streak tube.
Claim 3
Dependent Claim
39 words
A system for calibrating the time axis of an X-ray streak tube as claimed in claim 1 wherein said light source comprises a laser pulse generation device and an etalon, the duration of said light pulses being extremely short.
Claim 4
Dependent Claim
40 words
A system for calibrating the time axis of an X-ray streak tube as claimed in claim 1 wherein said means for energizing the deflection means of said streak tube generates a deflection voltage synchronized with said train of light pulses.
References Cited (Backward Citations)
US3033984A
Cited
US4606061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |