US3862573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring temperature difference at spaced points on metal surfaces
Assignee: JFE Engineering Corp
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Filing: 1972-11-20
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Granted: 1975-01-28
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Expires: 1992-11-20
Abstract
Abstract In an apparatus for measuring the temperature difference between two spaced apart points on the surface of a metal body by means of oscillation type noncontacting thermometers, there are provided a pair of oscillators each including respective detecting coils which are spaced apart with a predetermined spacing along the surface of the metal body and disposed close thereto, means for producing a signal corresponding to the complement of the ratio of the output frequencies of the oscillators or to the difference between the output frequencies; a digital-to-analogue converter for converting the signal to an analogue signal and a multiplier for multiplying the output of the digital-to-analogue converter by a constant or by the temperature coefficient of frequency thereby generating an output signal which is a function of said temperature difference.
Inventors
- 👤 Toshihiro Mori
- 👤 Takeo Yamada
- 👤 Katsujiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:16
CPC Classifications
G; G01; G01K; G01K3/00; G01K3/08; G01K3/14; G01K7/00; G01K7/36
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
147 words
Apparatus for measuring the temperature difference of the surface of a metal body comprising: a pair of oscillators including detecting coils, said detecting coils being spaced apart with a predetermined spacing along said surface of the metal body and disposed close to but not touching said surface, said coils having a characteristic which varies with temperature changes in the surface of the metal body disposed close thereto, and the respective output signals of said oscillators having frequencies (f1/f2) which are a function of said temperature variable characteristic of said detecting coils; electrical circuit means for producing a signal corresponding to the complement (1-f1/f2) of the ratio (f1/f2) of the frequencies of the output signals of said oscillators; and a multiplier coupled to said electrical circuit means for multiplying the complement signal by a constant, thereby generating an output signal which is a function of said temperature difference.
Claim 2
Dependent Claim
147 words
Apparatus for measuring the temperature difference of the surface of a metal body comprising: a pair of oscillators including detecting coils, said detecting coils being spaced apart with a predetermined spacing along said surface of the metal body and disposed close to but not touching said surface, said coils having a characteristic which varies with temperature changes in the surface of the metal body disposed close thereto, and the respective output signals of said oscillators having frequencies (f1/f2) which are a function of said temperature variable characteristic of said detecting coils; electrical circuit means for producing a signal corresponding to the complement (1-f1/f2) of the ratio (f1/f2) of the frequencies of the output signals of said oscillators; and a multiplier coupled to said electrical circuit means for multiplying the complement signal by a constant, thereby generating an output signal which is a function of said temperature difference.
Claim 3
Dependent Claim
153 words
Apparatus for measuring temperature difference of the surface of a metal body comprising: a pair of oscillators including detecting coils, said detecting coils being spaced apart with a predetermined spacing along said surface of the metal body and disposed close to but not touching said surface, said coils having a characteristic which varies with temperaturE changes in the surface of the metal body disposed close thereto, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; electrical circuit means for producing a signal (f1-f2) corresponding to the difference between the frequencies of the output signals (f1, f2) of said oscillators; and a multiplier coupled to said electrical circuit means for multiplying the difference signal by a value corresponding to the temperature coefficient of frequency variations, thereby generating an output signal which is a function of said temperature difference.
Claim 4
Dependent Claim
153 words
Apparatus for measuring temperature difference of the surface of a metal body comprising: a pair of oscillators including detecting coils, said detecting coils being spaced apart with a predetermined spacing along said surface of the metal body and disposed close to but not touching said surface, said coils having a characteristic which varies with temperaturE changes in the surface of the metal body disposed close thereto, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; electrical circuit means for producing a signal (f1-f2) corresponding to the difference between the frequencies of the output signals (f1, f2) of said oscillators; and a multiplier coupled to said electrical circuit means for multiplying the difference signal by a value corresponding to the temperature coefficient of frequency variations, thereby generating an output signal which is a function of said temperature difference.
Claim 5
Dependent Claim
14 words
The apparatus according to claim 1 wherein said electrical circuit means comprises a counter.
Claim 6
Dependent Claim
14 words
The apparatus according to claim 2 wherein said electrical circuit means comprises a counter.
Claim 7
Dependent Claim
26 words
The apparatus according to claim 1 wherein said metal body comprises steel sheets having substantially the same electric conductivity and the temperature coefficient of magnetic permeability.
Claim 8
Dependent Claim
26 words
The apparatus according to claim 2 wherein said metal body comprises steel sheets having substantially the same electric conductivity and the temperature coefficient of magnetic permeability.
Claim 9
Dependent Claim
119 words
A non-contact-type method of measuring the temperature difference between two spaced apart points on the surface of a metal body, comprising: disposing a pair of spaced apart detecting coils of a pair of oscillators close to said surface, said coils having a characteristic which varies with temperature changes in said surface, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; producing a signal corresponding to the complement (1-f1/f2) of the ratio (f1/f2) of the frequences of the output signals of said oscillators; and multiplying the complement signal by a constant to produce an output signal which is a function of said temperature difference.
Claim 10
Dependent Claim
119 words
A non-contact-type method of measuring the temperature difference between two spaced apart points on the surface of a metal body, comprising: disposing a pair of spaced apart detecting coils of a pair of oscillators close to said surface, said coils having a characteristic which varies with temperature changes in said surface, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; producing a signal corresponding to the complement (1-f1/f2) of the ratio (f1/f2) of the frequences of the output signals of said oscillators; and multiplying the complement signal by a constant to produce an output signal which is a function of said temperature difference.
Claim 11
Dependent Claim
125 words
A non-contact-type method of measuring the temperature difference between two spaced apart points on the surface of a metal body, comprising: disposing a pair of spaced apart detecting coils of a pair of oscillators close to said surface, said coils having a characteristic which varies with temperature changes in said surface, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; producing a signal corresponding to the difference (f1-f2) between the frequencies of the output signals (f1, f2) of said oscillators; and multiplying the difference signal by a value corresponding to the temperature coefficient of frequency variations to produce an output signal which is a function of said temperature difference.
Claim 12
Dependent Claim
125 words
A non-contact-type method of measuring the temperature difference between two spaced apart points on the surface of a metal body, comprising: disposing a pair of spaced apart detecting coils of a pair of oscillators close to said surface, said coils having a characteristic which varies with temperature changes in said surface, and the respective output signals of said oscillators having frequencies (f1, f2) which are a function of said temperature variable characteristic of said detecting coils; producing a signal corresponding to the difference (f1-f2) between the frequencies of the output signals (f1, f2) of said oscillators; and multiplying the difference signal by a value corresponding to the temperature coefficient of frequency variations to produce an output signal which is a function of said temperature difference.
Claim 13
Dependent Claim
44 words
The apparatus according to claim 1 wherein the electrical circuit means provides a digital output signal, and further comprising a digital-to-analogue converter coupled between said electrical circuit means and said multiplier for converting the output of said electrical circuit means into an analogue signal.
Claim 14
Dependent Claim
44 words
The apparatus according to claim 2 wherein the electrical circuit means provides a digital output signal and further comprising a digital-to-analogue converter coupled between said electrical circuit means and said multiplier for converting the output of said electrical circuit means into an analogue signal.
Claim 15
Dependent Claim
30 words
A method according to claim 7 wherein said complement signal is a digital signal and further comprising converting said digital signal to an analogue signal prior to said multiplying step.
Claim 16
Dependent Claim
30 words
A method according to claim 8 wherein said difference signal is a digital signal and further comprising convertiNg said digital signal to an analogue signal prior to said multiplying step.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |