DE2704128C3 - Procedure for dynamic differentiation between fault displays and errors in ultrasonic testing - Google Patents
Procedure for dynamic differentiation between fault displays and errors in ultrasonic testingInfo
- Publication number
- DE2704128C3 DE2704128C3 DE19772704128 DE2704128A DE2704128C3 DE 2704128 C3 DE2704128 C3 DE 2704128C3 DE 19772704128 DE19772704128 DE 19772704128 DE 2704128 A DE2704128 A DE 2704128A DE 2704128 C3 DE2704128 C3 DE 2704128C3
- Authority
- DE
- Germany
- Prior art keywords
- test
- error
- difference
- errors
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4445—Classification of defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/50—Systems of measurement, based on relative movement of the target
- G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
- G01S15/523—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Description
Die Erfindung betrifft ein Verfahren zur dynamischen Unterscheidung zwischen Störanzeigen, die von im Ankopplungsmedium enthaltenen kleinen mediumfremden Volumina, wie schwebender Zunder oder Luftblasen, herrühren und wirklichen Fehlern im Prüfling bei der Ultraschallprüfung mit einer Relativbewegung zwischen Prüfkopf und Fehler.The invention relates to a method for dynamic differentiation between fault displays that are from Small volumes foreign to the medium contained in the coupling medium, such as floating scale or Air bubbles originate from and real defects in the test object during the ultrasonic test with a relative movement between probe and fault.
Bei der Ultraschallprüfung mit Relativbewegung zwischen Prüf kopf und Fehler, z. B. bei Tauchtechnikprufanlagen mit spiralförmigem Rohrvorschub können unter anderem durch Luftblasen, Zunder usw. im Ankopplungsmedium Fehler der Prüflinge vorgetäuscht werden. Zur Zeit ist kein Verfahren bekannt, das diese Störanzeige von natürlichen Fehlern unterscheidet. In the ultrasonic test with relative movement between the test head and the defect, e.g. B. in diving technology test systems with a spiral tube feed, air bubbles, scale, etc. flaws in the test items are simulated in the coupling medium. No procedure is currently known that distinguishes this fault indication from natural errors.
Es ist Aufgabe der Erfindung, ein Verfahren zur dynamischen Unterscheidung zwischen Störanzeigen und Fehlern zu schaffen, um die erkannten Störanzeigen ausblenden zu können.It is the object of the invention to provide a method for dynamic differentiation between fault displays and to create errors in order to be able to hide the detected fault displays.
Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Verfahren vorgeschlagen, welches im Patentanspruch 1 beschrieben ist.To solve this problem, a method is proposed according to the invention, which is described in claim 1 is described.
Die vorteilhafte Anwendung des Verfahrens ist nachstehend an einer Tauchtechnikprüfanlage mit spiralförmigem Rohrvorschub beschrieben und mit Hilfe von Zeichnungen schematisch dargestellt:The advantageous application of the method is shown below on an immersion technology test system spiral pipe feed described and shown schematically with the help of drawings:
Fig. 1 zeigt einen Rohrquerschnitt;Fig. 1 shows a pipe cross section;
Fig. 2 zeigt Ultraschallbilder in Amplituden/Zeit-Darstellung. 2 shows ultrasound images in amplitude / time representation.
Grundsätzlich unterscheiden sich Anzeigen von wirklichen Fehlern und Störanzeigen von Zunder usw. durch wesentliche Unterschiede in der Relativgeschwindigkeit zwischen Prüf kopf und Anzeigestelle. Während sich Zunderteilchen oder Luftblasen innerhalb des Tauchbeckens mit einer Geschwindigkeit in einer Größenordnung von 1 bis 10 mm/sec bcwe-■ gen. ergibt sich die Relativgeschwindigkeit eines echten Fehlers im Prüfling in Abhängigkeit vom Rohrdurchmesser und der Anzahl der Umdrehungen innerhalb der Zeiteinheit.Basically, displays differ from real errors and fault displays from tinder, etc. due to significant differences in the relative speed between the test head and the display point. While scale particles or air bubbles move within the dip tank at a speed on the order of 1 to 10 mm / sec bcwe- ■ gen. results in the relative speed of a real defect in the test object as a function of the pipe diameter and the number of revolutions within the time unit.
,„ VF = π Χ D XU , “ V F = π Χ D XU
D = Durchmesser des Rohres D = diameter of the pipe
U = Anzahl der Umdrehungen/sec U = number of revolutions / sec
Bei heute üblichen Umdrehungen von 200 bis 1000 Umdrehungen/min und Rohren im Durchmesserbe-ι "> reich von 20 bis 200 mm ergeben sich als Relativgeschwindigkeiten zwischen Prüf kopf und Fehler Werte von 200 bis 10000 mm/sec.At today's usual revolutions of 200 to 1000 revolutions / min and tubes in the diameter range "> ranging from 20 to 200 mm, the relative speeds between the test head and the error result in values from 200 to 10000 mm / sec.
Beide RelativgeschwindigV.eiten unterscheiden sich also deutlich voneinander.Both sides of the relative speed therefore differ significantly from one another.
λ Die Relativgeschwindigkeit zwischen Prüf kopf und Anzeige ist nicht direkt meßbar, sie fällt jedoch indirekt über eine Laufzeitmessung bei der Ultraschallprüfung an.λ The relative speed between the probe and The display cannot be measured directly, but it falls indirectly via a transit time measurement in the ultrasonic test at.
In der Zeichnung (Fig. 1) ist das Rohr 1 mit einem -!">i Fehler 2 behaftet und wird durch einen Prüfkopf 3 beschallt. Der Verlauf des Ultraschall-Kernstrahles vom Prüfkopf 3 zum Fehler 2 und zurück ist durch die Linie 5 angezeigt. Bei dieser Prüfung ergeben sich für zwei aufeinanderfolgende Prüf takte die in Fig. 2 ίο gezeigten Ultraschallbilder in Amplituden/Zeit-Darstellung. Die Anregung des Ultraschalls wird durch den Sendeimpuls 6 ausgelöst. Über den Schalleintrittspunkt 4 in den Prüfling 1, der als Eintrittsecho 7 angezeigt wird, gelangt der Ultraschall an den Fehr. ler 2, der als Fehleramplitude 8 in der Kathodenstrahldarstellung sichtbar ist.In the drawing (FIG. 1) the pipe 1 is afflicted with a -! "> I error 2 and is checked by a test head 3 sonicated. The course of the ultrasonic core beam from test head 3 to fault 2 and back is through line 5 is displayed. During this test, the test cycles shown in FIG. 2 result for two successive test cycles ίο shown ultrasound images in amplitude / time representation. The excitation of the ultrasound is triggered by the transmission pulse 6. About the sound entry point 4 in the test item 1, which is displayed as the entry echo 7, the ultrasound reaches the Fehr. ler 2, which is visible as error amplitude 8 in the cathode ray display.
Bei einer Zeitmessung zwischen Sendeimpuls 6 und Fehleramplitude 8 ergibt sich die Schallaufzeit I1 im ersten Prüftakt. Beim nachfolgenden Prüftakt wird 4(i wiederum eine Zeitmessung I2 zwischen Sendeimpuls 6 und dein Fehlerecho 8a durchgeführt, wobei durch die Rotation des Rohres 1 in Richtung auf den Prüf kopf 3 die Zeit tv die kleiner als die Zeit f, des vorhergegangenen Prüftaktes ist, in Abhängigkeit der -ti vorgenannten Einflüsse, der Impulsfolgefrequenz bei der Prüfung und des Einschallwinkels des Ultraschalls gemessen wird.With a time measurement between the transmission pulse 6 and the error amplitude 8, the sound propagation time I 1 results in the first test cycle. During the subsequent test cycle 4 (i, a time measurement I 2 between the transmission pulse 6 and the error echo 8a is carried out, the time t v being shorter than the time f of the previous test cycle due to the rotation of the tube 1 in the direction of the test head 3 , depending on the influences mentioned above, the pulse repetition frequency during the test and the angle of incidence of the ultrasound is measured.
Durch eine Differenzbildung zwischen den Zeiten r, und t2 ergibt sich ein Zeitunterschied, der als Maß -)» für die Bestätigung auf Fehler aus dem Prüfling oder Störanzeige durch Luftblasen im Wasser oder schwebender Zunderteilchen benutzt wird.By calculating the difference between the times r 1 and t 2, a time difference results which is used as a measure -) »for the confirmation of faults in the test object or fault indication due to air bubbles in the water or floating scale particles.
Wird die Zeitdifferenz der in zwei aufeinanderfolgenden Prüftakten gemessenen Schallaufzeiten als γ-, Absolutmaß genommen, so ist der Einfluß der Bewegung des Fehlers vom oder zum Prüfkopf kompensiert. If the time difference between the sound propagation times measured in two successive test cycles is taken as a γ, absolute measure, the influence of the movement of the error from or to the test head is compensated.
Die erfindungsgemäße dynamische Entstörung läßt sich in Verbindung mit der bereits vorgeschlagenen statistischen Entstörung mit Hilfe von zwei Diskriminatorschwellen bei einem Monitor auch bei Fehleramplituden im Bereich der Ansprechschwelle des Monitors anwenden.The dynamic interference suppression according to the invention can be used in conjunction with the one already proposed Statistical interference suppression with the help of two discriminator thresholds on a monitor even with error amplitudes apply in the area of the response threshold of the monitor.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (2)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772704128 DE2704128C3 (en) | 1977-01-28 | 1977-01-28 | Procedure for dynamic differentiation between fault displays and errors in ultrasonic testing |
IT2935077A IT1086999B (en) | 1977-01-28 | 1977-11-07 | PROCEDURE FOR THE DIFFERENTIATION OF INTERFERENCE AND DEFECTS IN THE CONTROL WITH ULTRASOUNDS |
FR7800927A FR2379070A1 (en) | 1977-01-28 | 1978-01-13 | DYNAMIC DISCRIMINATION PROCESS BETWEEN PARASITIC ECHOES AND FAULT ECHOES IN ULTRASONIC CONTROL |
JP53005138A JPS5928261B2 (en) | 1977-01-28 | 1978-01-20 | A method for dynamically distinguishing interference echoes and defective echoes in ultrasonic inspection |
GB264578A GB1600643A (en) | 1977-01-28 | 1978-01-23 | Method of dynamically discriminating between flaws and indications of faults with ultrasonic testing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772704128 DE2704128C3 (en) | 1977-01-28 | 1977-01-28 | Procedure for dynamic differentiation between fault displays and errors in ultrasonic testing |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2704128A1 DE2704128A1 (en) | 1978-08-10 |
DE2704128B2 DE2704128B2 (en) | 1978-11-16 |
DE2704128C3 true DE2704128C3 (en) | 1979-07-26 |
Family
ID=6000087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19772704128 Expired DE2704128C3 (en) | 1977-01-28 | 1977-01-28 | Procedure for dynamic differentiation between fault displays and errors in ultrasonic testing |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5928261B2 (en) |
DE (1) | DE2704128C3 (en) |
FR (1) | FR2379070A1 (en) |
GB (1) | GB1600643A (en) |
IT (1) | IT1086999B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1592601A (en) * | 1977-02-19 | 1981-07-08 | Rolls Royce | Apparatus for ultrasonic examination |
GB2114758B (en) * | 1982-02-05 | 1985-07-31 | Rolls Royce | Ultrasonic flaw detector signal analyser |
DE3204797C2 (en) * | 1982-02-11 | 1983-12-29 | Nukem Gmbh, 6450 Hanau | Pulse-echo method for non-destructive ultrasonic testing of materials |
JPS60177651U (en) * | 1984-05-01 | 1985-11-26 | 株式会社 三ツ葉電機製作所 | motor ventilation system |
JPS6155456U (en) * | 1984-09-17 | 1986-04-14 | ||
JPH058770Y2 (en) * | 1985-12-04 | 1993-03-04 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3693100A (en) * | 1971-04-09 | 1972-09-19 | Presearch Inc | Cumulative enhancement signal processor |
-
1977
- 1977-01-28 DE DE19772704128 patent/DE2704128C3/en not_active Expired
- 1977-11-07 IT IT2935077A patent/IT1086999B/en active
-
1978
- 1978-01-13 FR FR7800927A patent/FR2379070A1/en active Granted
- 1978-01-20 JP JP53005138A patent/JPS5928261B2/en not_active Expired
- 1978-01-23 GB GB264578A patent/GB1600643A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2379070A1 (en) | 1978-08-25 |
JPS5395690A (en) | 1978-08-22 |
GB1600643A (en) | 1981-10-21 |
JPS5928261B2 (en) | 1984-07-11 |
FR2379070B1 (en) | 1984-02-24 |
DE2704128A1 (en) | 1978-08-10 |
DE2704128B2 (en) | 1978-11-16 |
IT1086999B (en) | 1985-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAP | Request for examination filed | ||
OD | Request for examination | ||
C3 | Grant after two publication steps (3rd publication) | ||
8339 | Ceased/non-payment of the annual fee |