US3574282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine temperature spread detector
Assignee: Kollsman Instrument Corp
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Filing: 1969-02-24
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Granted: 1971-04-13
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Expires: 1989-02-24
Abstract
Abstract A temperature spread detector for detecting a difference in temperature at various areas of a machine, such as a jet engine. The spread detector includes thermocouples for establishing signals representative of the temperature at various points, which signals are then converted to a sequential waveform by multiplexing means with such waveform being fed to minimum and maximum detectors which produce minimum and maximum values which, when accumulated in a summing amplifier, will produce a signal representative of temperature spread.
Inventors
- 👤 Kenneth R Curwen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:14
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
The combination in a temperature detector of a plurality of thermocouples for producing individual signals each representing the temperature at a different point in a various temperature zone, each of said thermocouples having an individual live conductor of a first material and sharing a common conductor of a second material, comparison means responsive to said individual signals for providing an output signal corresponding to the difference between the maximum and minimum of the individual signals so that said output signal represents the temperature spread, and cold junction compensation means interposed between said thermocouples and said comparison means for inserting correction voltages into said individual signals, the magnitude of said correction voltages being dependent upon the ambient temperature conditions at said cold junction compensation means and the nature of the conductors of said thermocouples relative to the nature of the conductors utilizEd as input conductors to said comparison means, each said live conductor and said common conductor being the input to said cold junction compensation means, said cold junction compensation means having an equal number of output conductors as the total number of input conductors, said output conductors being of a third material.
Claim 2
Dependent Claim
192 words
The combination in a temperature detector of a plurality of thermocouples for producing individual signals each representing the temperature at a different point in a various temperature zone, each of said thermocouples having an individual live conductor of a first material and sharing a common conductor of a second material, comparison means responsive to said individual signals for providing an output signal corresponding to the difference between the maximum and minimum of the individual signals so that said output signal represents the temperature spread, and cold junction compensation means interposed between said thermocouples and said comparison means for inserting correction voltages into said individual signals, the magnitude of said correction voltages being dependent upon the ambient temperature conditions at said cold junction compensation means and the nature of the conductors of said thermocouples relative to the nature of the conductors utilizEd as input conductors to said comparison means, each said live conductor and said common conductor being the input to said cold junction compensation means, said cold junction compensation means having an equal number of output conductors as the total number of input conductors, said output conductors being of a third material.
Claim 3
Dependent Claim
124 words
The combination in a temperature detector of a plurality of temperature responsive detection means for producing individual signals each representing the temperature at a different point in a various temperature zone, and comparison means responsive to said individual signals for providing an output signal corresponding to the difference between the maximum and minimum of the individual signals so that said output signal represents the temperature spread, said comparison means including sequencing means responsive to said individual signals for producing a sequential waveform comprised of said individual signals and detection means responsive to said waveform for generating maximum and minimum values representative of the maximum and minimum of said individual signals, said detection means including a pair of operational amplifiers each including a feedback loop.
Claim 4
Dependent Claim
124 words
The combination in a temperature detector of a plurality of temperature responsive detection means for producing individual signals each representing the temperature at a different point in a various temperature zone, and comparison means responsive to said individual signals for providing an output signal corresponding to the difference between the maximum and minimum of the individual signals so that said output signal represents the temperature spread, said comparison means including sequencing means responsive to said individual signals for producing a sequential waveform comprised of said individual signals and detection means responsive to said waveform for generating maximum and minimum values representative of the maximum and minimum of said individual signals, said detection means including a pair of operational amplifiers each including a feedback loop.
Claim 5
Dependent Claim
14 words
The combination of claim 2, wherein said pair of operational amplifiers have opposite gains.
Claim 6
Dependent Claim
27 words
The combination of claim 3, wherein each of said feedback loops include storage means for accumulating said maximum and minimum values which may exist in said waveforms.
Claim 7
Dependent Claim
11 words
The combination of claim 4, wherein said storage means comprise capacitors.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |