US3742191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared temperature sensor and control for use with heated, moving bodies
Assignee: IRTRONICS INCORPORATED A CORP OF DE
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Filing: 1971-05-04
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Granted: 1973-06-26
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Expires: 1991-05-04
Abstract
Abstract A temperature sensor is provided for measuring infrared radiation from a heated, moving processing device. The measurement is made from a ''''black body'''' cavity extending within the device being measured and so provides greater accuracy of readings. If the device being measured is cylindrical and rotates, the cavity is along the edge of the rotational surface and may be subdivided so as to provide a chopper for the readings. Control circuitry associated with the infrared detector allows the sensor to control heating elements within the device.
Inventors
- 👤 R Poole
- 👤 D Bulkley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:31
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/0022; G01K; G01K13/00; G01K13/04; G01K13/08; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/27
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
In a rotating device with a heated surface having a heater Therein and a control circuit therefor, a temperature control for closely controlling the temperature of said surface by operation of said heater, said temperature control including a cylindrical groove in said device adjacent said surface and having a common axis with said device, said groove having an opening therefrom facing in a direction parallel to said axis, a detector positioned adjacent to said opening to measure infrared radiation from said groove and to produce an output signal corresponding thereto, and means interconnecting said detector and said control circuit whereby said control circuit may control the output of said heater in response to signals from said detector.
Claim 2
Dependent Claim
117 words
In a rotating device with a heated surface having a heater Therein and a control circuit therefor, a temperature control for closely controlling the temperature of said surface by operation of said heater, said temperature control including a cylindrical groove in said device adjacent said surface and having a common axis with said device, said groove having an opening therefrom facing in a direction parallel to said axis, a detector positioned adjacent to said opening to measure infrared radiation from said groove and to produce an output signal corresponding thereto, and means interconnecting said detector and said control circuit whereby said control circuit may control the output of said heater in response to signals from said detector.
Claim 3
Dependent Claim
18 words
A temperature control as set forth in claim 1 in which said groove is a black body radiator.
Claim 4
Dependent Claim
63 words
In a temperature control as set forth in claim 1, interrupting means for regularly and periodically interrupting the infrared radiation received by said detector from said groove, said interrupting means being integral with said device to rotate therewith, wyereby said interrupting means acts as a chopper during rotation of said device to cause said radiation to be received by said detector in pulses.
Claim 5
Dependent Claim
27 words
In a temperature control as set forth in claim 3, said interrupting means providing a period between said interruptions greater than the rise time of said detector.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |