US3834237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermocouple for surface temperature measurements
Assignee: Leeds and Northrup Co
•
Filing: 1972-10-05
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Granted: 1974-09-10
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Expires: 1992-10-05
Abstract
Abstract The improved surface temperature probe is of the type which utilizes a heater and a differential temperature measurement to control the heater so as to minimize the temperature gradient along the probe. The improvement comprises the protective shielding of the thermocouple junctions by a metal shield and the addition of supplementary heater sections to heat the shield so as to minimize the temperature gradient between the shield and the surface being measured.
Inventors
- 👤 D Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
246 words
In a surface temperature measuring probe having an elongated multibore insulator carrying a first thermocouple means contactable with the surface, the temperature of which is to be measured, first insulation means, a second thermocouple means, second insulation means, and heater means, all of said means being in heat exchange relation and superposed in the order named to insulate said thermocouples from each other and said heater from said thermocouples, with the superposed combination of said means substantially coextensive with and facing the region of the surface spanable by contact with said first thermocouple means, said probe being of the type in which said heater is normally controlled in response to the temperature difference detected by said first and second thermocouple means to control the flow of current through said heater so that said difference is maintained substantially at zero to eliminate any net heat flow between said first thermocouple means and said surface upon contact therewith, the improvement comprising: a protective metal shield fixed in overlaying relationship to the area of said probe adjacent the portion of the first thermocouple means contactable with the surface, and additional heater means in the space between the multibore insulator and the shield and surrounded by ceramic cement so that said cement fills said space, said heater means being in sufficient heat exchange relationship with said shield to eliminate any net heat flow between said shield and said surface when said first thermocouple means is in contact with said surface.
Claim 2
Dependent Claim
246 words
In a surface temperature measuring probe having an elongated multibore insulator carrying a first thermocouple means contactable with the surface, the temperature of which is to be measured, first insulation means, a second thermocouple means, second insulation means, and heater means, all of said means being in heat exchange relation and superposed in the order named to insulate said thermocouples from each other and said heater from said thermocouples, with the superposed combination of said means substantially coextensive with and facing the region of the surface spanable by contact with said first thermocouple means, said probe being of the type in which said heater is normally controlled in response to the temperature difference detected by said first and second thermocouple means to control the flow of current through said heater so that said difference is maintained substantially at zero to eliminate any net heat flow between said first thermocouple means and said surface upon contact therewith, the improvement comprising: a protective metal shield fixed in overlaying relationship to the area of said probe adjacent the portion of the first thermocouple means contactable with the surface, and additional heater means in the space between the multibore insulator and the shield and surrounded by ceramic cement so that said cement fills said space, said heater means being in sufficient heat exchange relationship with said shield to eliminate any net heat flow between said shield and said surface when said first thermocouple means is in contact with said surface.
Claim 3
Dependent Claim
255 words
In a surface temperature measuring probe having an elongated multibore insulator with an end tapered to form a conic frustum so that said end carries a first thermocouple means contactable with the surface, the temperature of which is to be measured, first insulation means, second thermocouple means, second insulation means, and heater means, all of said means being in heat exchange relation and superposed in the order named to insulate said thermocouples from each other and said heater from said thermocouples, with the superposed combination of said means substantially coextensive with and facing the region of the surface spanable by contact with said first thermocouple means, said probe being of the type in which said heater is normally controlled in response to the temperature difference detected by said first and second thermocouple means to control the flow of current through said heater so that said difference is maintained substantially at zero to eliminate any net heat flow between said first thermocouple means and said surface upon contact therewith, the improvement comprising: a protective metal shield shaped like a conic frustum and fixed in overlaying relationship to the portion of the insulator shaped like a conic frustum, said shield being open at both ends to allow contact between the first thermocouple means and the surface whose temperature is to be measured, and additional heater means in sufficient heat exchange relationship with said shield to eliminate any net heat flow between said shield and said surface when said first thermocouple means is in contact with said surface.
Claim 4
Dependent Claim
255 words
In a surface temperature measuring probe having an elongated multibore insulator with an end tapered to form a conic frustum so that said end carries a first thermocouple means contactable with the surface, the temperature of which is to be measured, first insulation means, second thermocouple means, second insulation means, and heater means, all of said means being in heat exchange relation and superposed in the order named to insulate said thermocouples from each other and said heater from said thermocouples, with the superposed combination of said means substantially coextensive with and facing the region of the surface spanable by contact with said first thermocouple means, said probe being of the type in which said heater is normally controlled in response to the temperature difference detected by said first and second thermocouple means to control the flow of current through said heater so that said difference is maintained substantially at zero to eliminate any net heat flow between said first thermocouple means and said surface upon contact therewith, the improvement comprising: a protective metal shield shaped like a conic frustum and fixed in overlaying relationship to the portion of the insulator shaped like a conic frustum, said shield being open at both ends to allow contact between the first thermocouple means and the surface whose temperature is to be measured, and additional heater means in sufficient heat exchange relationship with said shield to eliminate any net heat flow between said shield and said surface when said first thermocouple means is in contact with said surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |