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US4380924A
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Method for monitoring flow condition of liquid metal
Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
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Filing: 1981-04-16
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Granted: 1983-04-26
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Expires: 2001-04-16
Abstract
Abstract A method for monitoring flow condition of a liquid metal which employs a detector consisting of an excitation coil applied with an a.c. current and at least two detection coils disposed on both sides of said excitation coil. The detector is disposed in the flowing direction of the liquid metal and a peak point of the cross-correlation function of fluctuation signals occurring in said detection coils is examined. By detecting the moving direction, the polarity and the magnitude of the peak point, the flow condition can be comprehensively ascertained, such as a change in flow velocity, a change in void fraction, the presence of voids and transit velocity of void.
Inventors
- 👤 Koichiro Nakamoto
- 👤 Kiyokazu Ishii
- 👤 Nobumi Ohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/08; G01F; G01F1/00; G01F1/56; G01F1/704; G01F1/708; G01F1/712; G01F1/74; G01P5/083; G01P5/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A method for monitoring flow condition of a liquid metal comprising: disposing in the flowing direction of the liquid metal a detector consisting of an excitation coil applied with an a.c. current and at least two detection coils disposed on both sides of said excitation coil; and detecting the moving direction of a peak point of the cross-correlation function of fluctuation signals occurring in said detection coils to thereby determine a change of flow condition of the liquid metal.
Claim 2
Independent Claim
79 words
A method for monitoring flow condition of a liquid metal comprising: disposing in the flowing direction of the liquid metal a detector consisting of an excitation coil applied with an a.c. current and at least two detection coils disposed on both sides of said excitation coil; and detecting the moving direction of a peak point of the cross-correlation function of fluctuation signals occurring in said detection coils to thereby determine a change of flow condition of the liquid metal.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein the change of flow condition is a change in flow velocity and/or in void fraction of the liquid metal.
Claim 4
Independent Claim
75 words
A method for monitoring flow condition of a liquid metal comprising: disposing in the flowing direction of the liquid metal a detector consisting of an excitation coil applied with an a.c. current and at least two detection coils disposed on both sides of said excitation coil; and detecting the polarity of a peak point of the cross-correlation function of fluctuation signals occurring in said detection coils to thereby determine the presence or absence of voids.
Claim 5
Independent Claim
75 words
A method for monitoring flow condition of a liquid metal comprising: disposing in the flowing direction of the liquid metal a detector consisting of an excitation coil applied with an a.c. current and at least two detection coils disposed on both sides of said excitation coil; and detecting the polarity of a peak point of the cross-correlation function of fluctuation signals occurring in said detection coils to thereby determine the presence or absence of voids.
Claim 6
Dependent Claim
24 words
The method according to claim 3 wherein the magnitude of the peak point of the positive polarity is detected to thereby determine void fraction.
Claim 7
Dependent Claim
45 words
The method according to claim 3 wherein a delay time to provide the peak point of the positive polarity is detected, and void flow velocity in the liquid metal is determined from the thus detected delay time and a distance L between said detection coils.
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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |