US3718757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature monitoring
Assignee: International Business Machines Corp
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Filing: 1970-12-29
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Granted: 1973-02-27
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Expires: 1990-12-29
Abstract
Abstract A television camera, such as an infrared television camera, is positioned to view a hot surface, the temperature profile of which is to be monitored and the temperature at selected points of which is to be measured. The specific application to a Czochralski type crystal puller is described. A television monitor is employed to give the temperature profile and an indicator scheme is employed with the TV monitor to allow manual positioning of the indicator to visually chosen spots on the monitor whereby the temperature at those visually chosen spots is automatically provided. The horizontal and vertical voltage used to position the pointer is also used to control a sample and hold circuit to thereby allow the sampling and holding of the video signal corresponding to the selected point. The video signal sampled is converted to digital, which digital signal may be employed to provide a visual indication of the temperature at the selected point, or alternatively, to control a process or, for example, to be processed by a computer. The particular points chosen at which temperatures are to be determined, may systematically be achieved by way of a computer.
Inventors
- 👤 L Gulitz
- 👤 T Kwap
- 👤 Kane D O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/33; G; G01; G01J; G01J5/00; C; C30; C30B; C30B15/00; C30B15/20; C30B15/22; C30B15/26; G01J5/0044; G01J5/02; G01J5/025; G01J5/04; G01J5/05; G01J5/051; H04N23/00; H04N23/20; H04N23/23; G01J2005/0077; G01J5/48; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1012
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
193 words
A method of detecting radiation emission indicative of the heat produced at selected points on objects, comprising the steps of: positioning an infrared television camera so that the objects from which emission is to be detected are placed within the field of view of said camera; selecting points within the field of view of said camera at which the emission is to be detected, said points being visually selectable using a television monitor having displayed upon its display surface said objects and a moveable indicator which is selectively positionable with respect thereto in accordance with horizontal and vertical voltage levels manually selected using a respective pair of potentiometers, said potentiometers acting to establish horizontal and vertical voltage levels corresponding to the respective horizontal and vertical position of said selected points in said field of view of said camera; comparing the respective horizontal and vertical sweep voltages of said television camera with the selected horizontal and vertical voltage levels; and sampling the video signal at a point in time when both said horizontal and vertical sweep voltages compare with the respective selected voltage levels to thereby produce the video signal for said selected points.
Claim 2
Independent Claim
193 words
A method of detecting radiation emission indicative of the heat produced at selected points on objects, comprising the steps of: positioning an infrared television camera so that the objects from which emission is to be detected are placed within the field of view of said camera; selecting points within the field of view of said camera at which the emission is to be detected, said points being visually selectable using a television monitor having displayed upon its display surface said objects and a moveable indicator which is selectively positionable with respect thereto in accordance with horizontal and vertical voltage levels manually selected using a respective pair of potentiometers, said potentiometers acting to establish horizontal and vertical voltage levels corresponding to the respective horizontal and vertical position of said selected points in said field of view of said camera; comparing the respective horizontal and vertical sweep voltages of said television camera with the selected horizontal and vertical voltage levels; and sampling the video signal at a point in time when both said horizontal and vertical sweep voltages compare with the respective selected voltage levels to thereby produce the video signal for said selected points.
Claim 3
Dependent Claim
22 words
The method as set forth in claim 1 wherein said objects include a crystal being grown in a Czochralski type crystal puller.
Claim 4
Dependent Claim
37 words
The method as set forth in claim 1 wherein said detecting involves measuring said radiation emission and wherein the magnitude of said sampled video signal is indicative of the magnitude of radiation emitted at the selected point.
Claim 5
Dependent Claim
28 words
The method as set forth in claim 3 wherein said measuring involves temperature measuring and said sampled video signal is indicative of the temperature at said selected points.
Claim 6
Dependent Claim
56 words
The method as set forth in claim 4 wherein a reference radiation emission source of known temperature is placed within the field of view of said camera and the voltage level of said video signal is calibrated in accordance therewith by sampling the reference radiation therefrom so that said video voltage is indicative of absolute temperature.
Claim 7
Dependent Claim
22 words
The method as set forth in claim 5 wherein said objects include a crystal being grown in a Czochralski type crystal puller.
Claim 8
Dependent Claim
30 words
The method as set forth in claim 6 including the further step of using rapid changes in the level of said video signal to measure the width of said crystal.
Claim 9
Independent Claim
206 words
A system for monitoring the radiation emitted by objects at any of a plurality of selected points on said objects with said radiation at said selected points being indicative of temperature thereat, comprising: infrared television camera means positioned so that said objects are within the field of view of said camera means; radiation emission reference means positioned within the field of view of said television camera means for calibrating said camera means so that the video signal therefrom is indicative of absolute temperature, said radiation emission reference Means providing emitted radiation at known temperatures of the emission source thereof; means to select points on said objects at which the radiation emitted is to be determined; means to sample the video signal from said camera means at points in time corresponding to the points in time when said camera means is producing the video signal for said selected points, said sampled video signal being indicative of the absolute temperature at the selected points, said means to sample the video signal including means to sample the video signal where there is a marked change in video level indicative of object boundaries so as to thereby obtain information from the sampled signal as to the widths of said objects.
Claim 10
Independent Claim
206 words
A system for monitoring the radiation emitted by objects at any of a plurality of selected points on said objects with said radiation at said selected points being indicative of temperature thereat, comprising: infrared television camera means positioned so that said objects are within the field of view of said camera means; radiation emission reference means positioned within the field of view of said television camera means for calibrating said camera means so that the video signal therefrom is indicative of absolute temperature, said radiation emission reference Means providing emitted radiation at known temperatures of the emission source thereof; means to select points on said objects at which the radiation emitted is to be determined; means to sample the video signal from said camera means at points in time corresponding to the points in time when said camera means is producing the video signal for said selected points, said sampled video signal being indicative of the absolute temperature at the selected points, said means to sample the video signal including means to sample the video signal where there is a marked change in video level indicative of object boundaries so as to thereby obtain information from the sampled signal as to the widths of said objects.
Claim 11
Dependent Claim
21 words
The system as set forth in claim 8 wherein said objects include a crystal being grown in an Czochralski-type crystal puller.
Claim 12
Independent Claim
206 words
A system for monitoring the temperature profile of objects and determining the temperature at selected points on said objects comprising: infrared television camera means having a video output signal therefrom and positioned so that said objects are within the field of view of said camera means; video display means coupled to receive the said video output signal from said infrared television camera means so as to display the temperature profile of said objects on the display surface thereof; radiation emission reference means positioned within the field of view of said infrared television camera means for calibrating said camera means so that the video signal therefrom is indicative of absolute temperature, means to select points on said objects at which temperature is to be determined, said means to select points including indicator means positionable upon the display surface of said video display means so that points at which the temperature is to be determined may be manually selected thereby; and means to sample the video signal from said camera means at points in time corresponding to the points in time when said camera means is producing the video signal corresponding to said selected points, said sampled video signal being indicative of the temperature at the selected points.
Claim 13
Independent Claim
206 words
A system for monitoring the temperature profile of objects and determining the temperature at selected points on said objects comprising: infrared television camera means having a video output signal therefrom and positioned so that said objects are within the field of view of said camera means; video display means coupled to receive the said video output signal from said infrared television camera means so as to display the temperature profile of said objects on the display surface thereof; radiation emission reference means positioned within the field of view of said infrared television camera means for calibrating said camera means so that the video signal therefrom is indicative of absolute temperature, means to select points on said objects at which temperature is to be determined, said means to select points including indicator means positionable upon the display surface of said video display means so that points at which the temperature is to be determined may be manually selected thereby; and means to sample the video signal from said camera means at points in time corresponding to the points in time when said camera means is producing the video signal corresponding to said selected points, said sampled video signal being indicative of the temperature at the selected points.
Claim 14
Independent Claim
171 words
A system for monitoring the temperature profile of objects and measuring the temperature at selected points on said objects comprising; infrared television camera means having a video output signal and positioned so that said objects are within the field of view of said camera means so as to thereby produce a video output signal representative of said view; television monitor means coupled to receive the said video output signal from said infrared television camera means so as to display the temperature profile of said objects thereon; indicator means positionable upon the display surface of said monitor means for selecting points thereon and producing horizontal and vertical signals indicative of the location of the selected points; and means coupled to both said indicator means for receiving said horizontal and vertical signals therefrom and to said camera means for receiving said video output signal therefrom to cause the sampling of said video signal at points corresponding to the points selected by said indicator means, in accordance with said horizontal and vertical signals therefrom.
Claim 15
Independent Claim
171 words
A system for monitoring the temperature profile of objects and measuring the temperature at selected points on said objects comprising; infrared television camera means having a video output signal and positioned so that said objects are within the field of view of said camera means so as to thereby produce a video output signal representative of said view; television monitor means coupled to receive the said video output signal from said infrared television camera means so as to display the temperature profile of said objects thereon; indicator means positionable upon the display surface of said monitor means for selecting points thereon and producing horizontal and vertical signals indicative of the location of the selected points; and means coupled to both said indicator means for receiving said horizontal and vertical signals therefrom and to said camera means for receiving said video output signal therefrom to cause the sampling of said video signal at points corresponding to the points selected by said indicator means, in accordance with said horizontal and vertical signals therefrom.
Claim 16
Dependent Claim
46 words
The system as set forth in claim 11 further including radiation emission reference means positioned within the field of view of said infrared television camera means for periodically calibrating said camera meaNs so that the said video output signal therefrom is accurately indicative of absolute temperature.
Claim 17
Dependent Claim
67 words
The system as set forth in claim 12 wherein said indicator means for selecting points, includes potentiometer means to manually position said indicator on the said display surface of said monitor means, said potentiometer means to manually position including means to produce horizontal and vertical voltage levels to be compared with the magnitude of the respective horizontal and vertical swEep voltage of said infrared television camera means.
Claim 18
Dependent Claim
113 words
The system as set forth in claim 13 wherein the horizontal and vertical voltage levels are respectively compared to the horizontal and vertical sweep voltages of said infrared television camera means in a respective pair of compare circuits and wherein the output from said compare circuits is coupled to pulse generator means for generating a marker pulse in response to coincident output signals from the respective compare circuits, said marker pulse being coupled to said television monitor means and a sample and hold circuit means for sampling the video output signal from said infrared television camera means at the time of occurrence of, and in accordance with the width of, said marker pulse.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |