Patent US2559839A successfully refreshed from Google Patents.
US4570489A
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Apparatus for detecting the evolution of an acoustic signal
Assignee: Electricite de France SA
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Filing: 1983-07-14
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Granted: 1986-02-18
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Expires: 2003-07-14
Abstract
Abstract Apparatus for detecting the evolution of an acoustic signal, comprising an acoustic sensor, as well as circuits for the amplification, filtering, detection and measurement of the effective value of the signal supplied by the sensor. The apparatus comprises a smoothing circuit, a sawtooth generator, an adder, a circuit for adjusting the effective value by straight segments and a circuit for carrying out sequence tests. The apparatus is adapted for use in the monitoring of steam generators in fast neutron reactors.
Inventors
- 👤 Alain Baumaire
- 👤 Thierry Desmas
- 👤 Guy Vambenepe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/421; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/24; G21; G21C; G21C17/00; G21C17/002; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
An apparatus for the detection of the sudden evolution of an acoustic signal received by acoustic sensors placed on a member, said acoustic sensors supplying an electrical signal, wherein said apparatus comprises a circuit for measuring the effective value of the signal supplied by the sensors and an electronic circuit for analyzing this effective value, wherein the analysis circuit comprises a circuit for smoothing the effective value of the signal, a sawtooth signal generator, an adder receiving the smoothed signal and the sawtooth signal and supplying a notched signal formed by the sum of said smoothed and sawtooth signals, a circuit receiving the smoothed signal and able to output a signal in the form of linear segments best approximating the smoothed signal, a test circuit connected to the adder supplying the notched signal and to the circuit supplying the linear segments, said test circuit being able to analyze the arrangement of the notched signal with respect to the signal in the form of linear segments with the aid of a sequence test, and a comparator connected to the test circuit and able to compare the result of the analysis with a predetermined threshold.
Claim 2
Independent Claim
193 words
An apparatus for the detection of the sudden evolution of an acoustic signal received by acoustic sensors placed on a member, said acoustic sensors supplying an electrical signal, wherein said apparatus comprises a circuit for measuring the effective value of the signal supplied by the sensors and an electronic circuit for analyzing this effective value, wherein the analysis circuit comprises a circuit for smoothing the effective value of the signal, a sawtooth signal generator, an adder receiving the smoothed signal and the sawtooth signal and supplying a notched signal formed by the sum of said smoothed and sawtooth signals, a circuit receiving the smoothed signal and able to output a signal in the form of linear segments best approximating the smoothed signal, a test circuit connected to the adder supplying the notched signal and to the circuit supplying the linear segments, said test circuit being able to analyze the arrangement of the notched signal with respect to the signal in the form of linear segments with the aid of a sequence test, and a comparator connected to the test circuit and able to compare the result of the analysis with a predetermined threshold.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, wherein the circuit for measuring the effective value is preceded by a low-pass filter operating below a few kilohertz.
Claim 4
Dependent Claim
26 words
An apparatus according to claim 1, wherein the member carrying the sensors is a steam generator, the apparatus being used for detecting leaks in said generator.
References Cited (Backward Citations)
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Cited
US3508433A
Cited
US3592967A
Cited
FR2253219A1
Cited
US4253167A
Cited
US4287581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |