US3784740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline inspection system
Assignee: Halliburton Co
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Filing: 1972-08-23
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Granted: 1974-01-08
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Expires: 1992-08-23
Abstract
Abstract A television inspection system for pipelines wherein the gain of the television camera and/or the camera target voltage is varied in a predetermined manner in synchronism with the scan of the television camera to compensate for nonlinear illumination of the pipeline interior.
Inventors
- 👤 G Copland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:05
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/50; H04N23/555; H04N23/70; H04N23/749; H04N23/76
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
In a television inspection system for pipelines including a television monitor and a television camera remote from but electrically connected to said monitor and adapted for movement along the axis of the pipeline to be inspected, the improvement comprising means responsive to the horizontal and vertical sync signals of the camera for modifying the target voltage of the camera cathode ray tube in accordance with a predetermined pattern synchronized with the scan of the television camera.
Claim 2
Dependent Claim
76 words
In a television inspection system for pipelines including a television monitor and a television camera remote from but electrically connected to said monitor and adapted for movement along the axis of the pipeline to be inspected, the improvement comprising means responsive to the horizontal and vertical sync signals of the camera for modifying the target voltage of the camera cathode ray tube in accordance with a predetermined pattern synchronized with the scan of the television camera.
Claim 3
Dependent Claim
18 words
The television inspection system of claim 1 wherein said target voltage modulation means includes phase locked loop means.
Claim 4
Dependent Claim
22 words
The television inspection system of claim 1 wherein said target voltage modulation is generally parabolic in both the horizontal and vertical planes.
Claim 5
Dependent Claim
87 words
The television inspection system of claim 1 wherein said amplitude modulation means includes: means for converting the horizontal sync singal of the camera to a half sine wave signal of the same frequency and a predetermined phase relationship; means for converting the vertical sync signal of the camera to a half sine wave signal of the same frequency and a predetermined phase relationship; and, means for combining said two half sine wave signals for application to the gain control terminal of the video amplifier of the camera.
Claim 6
Independent Claim
61 words
A method of inspecting the interior walls of a right circular cylinder comprising the steps of traversing the right circular cylinder with a cathode ray tube coaxially disposed therein while electronically modifying the target voltage thereof in accordance with a predetermined pattern in both the horizontal and vertical directions to thereby increase the linearization of the video signal from the generator.
Claim 7
Independent Claim
61 words
A method of inspecting the interior walls of a right circular cylinder comprising the steps of traversing the right circular cylinder with a cathode ray tube coaxially disposed therein while electronically modifying the target voltage thereof in accordance with a predetermined pattern in both the horizontal and vertical directions to thereby increase the linearization of the video signal from the generator.
Claim 8
Dependent Claim
78 words
The method of claim 5 wherein the predetermined pattern is derived from the horizontal and vertical sync signals from the camera by the steps of: a. providing first and second series of pulses equal respectively in recurrence rate to the horizontal and vertical sync signal; b. providing third and fourth signals respectively responsive to the first and second series of pulses, said third and fourth signals being rectified sine waves; and, c. combining the third and fourth signals.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |