DE4137616C1 - LF ultrasonic penetration tester for materials of high sound attenuation characteristics - uses conical collimating unit of compact porous foam material with through bore in central axis aligned with reception test head - Google Patents
LF ultrasonic penetration tester for materials of high sound attenuation characteristics - uses conical collimating unit of compact porous foam material with through bore in central axis aligned with reception test headInfo
- Publication number
- DE4137616C1 DE4137616C1 DE19914137616 DE4137616A DE4137616C1 DE 4137616 C1 DE4137616 C1 DE 4137616C1 DE 19914137616 DE19914137616 DE 19914137616 DE 4137616 A DE4137616 A DE 4137616A DE 4137616 C1 DE4137616 C1 DE 4137616C1
- Authority
- DE
- Germany
- Prior art keywords
- test head
- receiver
- bore
- materials
- collimator
- 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 - Lifetime
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
- G01N29/24—Probes
- G01N29/2462—Probes with waveguides, e.g. SAW devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
-
- 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
- G01N29/221—Arrangements for directing or focusing the acoustical 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2456—Focusing probes
-
- 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
- G01N2291/048—Transmission, i.e. analysed material between transmitter and receiver
Abstract
Description
Die Erfindung bezieht sich auf eine Einrichtung zur niederfrequenten Ul traschall-Durchschallungsprüfung in Tauchtechnik von Materialien extrem hoher Schallschwächung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for low-frequency ul ultrasound transmission test in immersion technology of materials extreme high sound attenuation according to the preamble of claim 1.
Eine solche Einrichtung ist aus der DE-OS 40 15 847 A1 bekannt. Die Prü fung von Materialien extrem hoher Schallschwächung erfordert den Einsatz der sogenannten Durchschallungstechnik im Zusammenhang mit niederen Prüf frequenzen, die im Bereich von 0,5 bis maximal 2 MHz liegen.Such a device is known from DE-OS 40 15 847 A1. The test Use of materials with extremely high sound attenuation requires use the so-called transmission technology in connection with low test frequencies in the range from 0.5 to a maximum of 2 MHz.
Aus den Druckschriften "Patent Abstracts of Japan" - Vol. 14; Mo. 405, vom 31. 08. 1990 - und Patent Abstracts of Japan - Vol. 11; No. 129; vom 23. 04. 1987 - sind in der Art verwandte Ausführungsformen bekanntgeworden. Ein richtungen nach diesem Stand der Technik weisen jedoch eine ungenügende Fehlerauflösung auf, die - wie in Fig. 2 skizziert - einmal darauf zurück zuführen ist, daß hohe Streuanteile aus einem großen Materialprobenbereich empfangen werden und zum andernmal die Prüfköpfe niedriger Frequenzen aus physikalischen Gründen nicht beliebig klein gebaut werden können. Der mi nimal erhältliche Schwingerdurchmesser für 1 MHz beträgt rund 6 mm.From the publications "Patent Abstracts of Japan" - Vol. 14; Mo. 405, Aug. 31, 1990 - and Patent Abstracts of Japan - Vol. 11; No. 129; dated April 23, 1987 - related embodiments have become known. A device according to this prior art, however, has an insufficient error resolution, which - as sketched in Fig. 2 - can be traced back to the fact that high scatter components are received from a large material sample area and, on the other hand, the test heads of low frequencies are not arbitrary for physical reasons can be built small. The minimum available vibrator diameter for 1 MHz is around 6 mm.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, mit der die Ortsauflösung ohne be sondere Änderung bestehender Konzeptionen in einfacher Weise wesentlich verbessert wird.The present invention has for its object a device to create the type mentioned, with which the spatial resolution without be special changes to existing concepts in a simple manner essential is improved.
Diese Aufgabe wird durch die im Anspruch 1 aufgezeigten Maßnahmen gelöst. In den Unteransprüchen sind Ausgestaltungen und Weiterbildungen aufgezeigt und in der nachfolgenden Beschreibung ist ein Ausführungsbeispiel erläutert. Die Figuren der Zeichnung ergänzen diese Erläuterungen. Es zeigtThis object is achieved by the measures outlined in claim 1 solved. Refinements and are in the subclaims Developments shown and in the description below is a Exemplary embodiment explained. The figures in the drawing complement this Explanations. It shows
Fig. 1 ein Schemabild des beschriebenen Ausführungsbeispiels, Fig. 1 is a schematic diagram of the embodiment described,
Fig. 2 ein Schemabild des bisherigen Standes der Technik, Fig. 2 is a schematic diagram of the prior art,
Fig. 3 eine Ansicht des Empfängers des Ausführungsbeispiels in schemati scher Darstellung, Fig. 3 is a view of the receiver of the embodiment in schemati shear representation,
Fig. 4a ein Prüfbild eines Durchschalltests mit Kollimator, wobei der Empfängerprüfkopf identisch mit der Ausführungsform des Standes der Technik ist, FIG. 4a, a test image of a Through sound tests with the collimator, wherein the Empfängerprüfkopf is identical to the embodiment of the prior art,
Fig. 4b ein Prüfbild des Durchschalltestes gemäß Fig. 4a, jedoch ohne den Kollimator. FIG. 4b is a test image of the test sound through FIG. 4a, but without the collimator.
In der Fig. 1 ist der Aufbau der Testeinrichtung zur niederfrequenten Ultraschall-Durchschaltungsprüfung in Tauchtechnik von Materialien extrem hoher Schallschwächung skizziert. Diese Einrichtung entspricht im wesent lichen denjenigen des Standes der Technik, wie aus der Fig. 2 entnommen werden kann. Es handelt sich in beiden Fällen um einen kombinierten Träger 10 für den Schallsender 13, den Schallempfänger 14 und den Prüfling P. Der Sender 13 steht mit einem Schallpulser 11, der Empfänger 14 mit dem Receiver 12 und entsprechenden Auswerteeinrichtungen in Verbindung.In Fig. 1, the structure of the test device for low-frequency ultrasonic circuit testing in immersion technology of materials with extremely high sound attenuation is outlined. This device corresponds to wesent union those of the prior art, as can be seen from FIG. 2. It is in both cases to a combined bearing 10 for the sound transmitter 13, the sound receiver 14 and the test object P. The transmitter 13 communicates with an acoustic pulser 11, the receiver 14 to the receiver 12 and respective evaluating devices combined.
Zur Lösung der gestellten Aufgabe wird nun vorgeschlagen, daß dem Empfän- gerprüfkopf 14 ein sogenannter Kollimatorvorsatz 15 zugeordnet wird. Die- ser Kollimatorvorsatz 15 besteht aus einem geschlossenporigen Schaumstoff kegel 15a der einerseits auf seiner dem Prüfkopf 16 zugewandten Fläche mit einem zylindrischen Teil 15b versehen ist, der in einer angepaßten Bohrung 16c den mit der Empfängerfläche 16a versehenen Teil des Prüfkopfes 16 auf nimmt, und andererseits in seiner Vertikalachse 15c eine Bohrung 15d von 2 mm bis 3 mm Durchmesser - oder diesen entsprechend an die Gegebenheiten angepaßt - aufweist. Die Achse 15c der Bohrung 15d mündet exakt in die Achse 16b des Prüfkopfes 16 und dadurch auch zentral in dessen Empfänger fläche 16a.To solve the problem, it is now proposed that a so-called collimator attachment 15 be assigned to the receiver test head 14 . This collimator attachment 15 consists of a closed-pore foam cone 15 a which, on the one hand, is provided on its surface facing the test head 16 with a cylindrical part 15 b, which in an adapted bore 16 c has the part of the test head 16 provided with the receiver surface 16 a takes, and on the other hand in its vertical axis 15 c has a bore 15 d of 2 mm to 3 mm in diameter - or adapted accordingly to the circumstances. The axis 15 c of the bore 15 d opens exactly into the axis 16 b of the test head 16 and thereby also centrally in the receiver surface 16 a.
Durch diese Ausgestaltung gelangen nunmehr nur die Anteile des gesendeten Impulses an den Empfänger 14, die die Materialprobe geradlinig in dem Kanal entsprechend dem Bohrungsdurchmesser 15d durchläßt. Der Kollimator vorsatz 15 verbessert - wie die Testbilder gemäß den Fig. 4a und 4b bewei sen - die Ortsauflösung einer Einrichtung der vorgenannten Art durch die Abschirmung des Streuanteils und außerdem noch durch die Verringerung der Empfängerfläche 16a des Prüfkopfes 16 auf die Größe der Kollimatorbohrung um 100% bis 500%, je nach Anwendung.With this configuration, now only the portions of the transmitted pulse reach the receiver 14 , which allows the material sample to pass straight through the channel in accordance with the bore diameter 15 d. The collimator header 15 improved - as the test images as shown in FIGS 4a and 4b BEWEI sen -., The spatial resolution of a device of the aforementioned type by the shielding of the stray proportion and further still by the reduction of the receiving surface 16 a of the test head 16 to the size of Kollimatorbohrung to 100% to 500%, depending on the application.
Zu den in den Fig. 4a und 4b gezeigten Testbildern ist noch zu sagen, daß die dargestellten beiden Tests auf ein und demselben Gerät nach dem Stand der Technik durchgeführt worden sind, wobei lediglich bei dem in Fig. 4a gezeigten Test der Prüfkopf 16 mit einem Kollimator 15 versehen worden ist, dessen Bohrung im wesentlichen dem Durchmesser von 6 mm des Prüffeldes entsprach. Die Steigerung der Auflösung durch die vorgeschlagenen Maßnahmen gegenüber derjenigen des Standes Technik (Fig. 4b) ist deutlich erkennbar.With regard to the test images shown in FIGS. 4a and 4b, it should also be said that the two tests shown have been carried out on one and the same device according to the prior art, with the test head 16 having only one in the test shown in FIG. 4a Collimator 15 has been provided, the bore of which essentially corresponded to the diameter of 6 mm of the test field. The increase in resolution by the proposed measures compared to that of the prior art ( FIG. 4b) is clearly recognizable.
Eine weitere Steigerung der Auflösung kann dadurch erreicht werden, daß der Kollimator 15 mit einer dem Sender 13 zugeordneten Fokussiereinrich tung (nicht gezeichnet) kombiniert wird. Weiterhin kann die Empfängerfläche 16a des Prüfkopfes 16 dimensionsmäßig durch die Anpassung an den Bohrungs durchmesser 15d des Kegels 15a minimiert werden.A further increase in resolution can be achieved by combining the collimator 15 with a focusing device (not shown) associated with the transmitter 13 . Furthermore, the receiver surface 16 a of the test head 16 can be dimensionally minimized by adapting to the bore diameter 15 d of the cone 15 a.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914137616 DE4137616C1 (en) | 1991-11-15 | 1991-11-15 | LF ultrasonic penetration tester for materials of high sound attenuation characteristics - uses conical collimating unit of compact porous foam material with through bore in central axis aligned with reception test head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914137616 DE4137616C1 (en) | 1991-11-15 | 1991-11-15 | LF ultrasonic penetration tester for materials of high sound attenuation characteristics - uses conical collimating unit of compact porous foam material with through bore in central axis aligned with reception test head |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4137616C1 true DE4137616C1 (en) | 1992-12-17 |
Family
ID=6444890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19914137616 Expired - Lifetime DE4137616C1 (en) | 1991-11-15 | 1991-11-15 | LF ultrasonic penetration tester for materials of high sound attenuation characteristics - uses conical collimating unit of compact porous foam material with through bore in central axis aligned with reception test head |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4137616C1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2199786B1 (en) * | 2008-12-18 | 2021-10-20 | NUOVO PIGNONE INTERNATIONAL S.r.l. | Ultrasound inspection methods for noisy cast materials and related probes |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4015847A1 (en) * | 1990-05-17 | 1991-11-21 | Messerschmitt Boelkow Blohm | Ultrasonic test head arrangement for metal sheet bonding - uses highly-damped LF impact wave sound head with measured frequency decreasing as thickness of plate assembly increases |
-
1991
- 1991-11-15 DE DE19914137616 patent/DE4137616C1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4015847A1 (en) * | 1990-05-17 | 1991-11-21 | Messerschmitt Boelkow Blohm | Ultrasonic test head arrangement for metal sheet bonding - uses highly-damped LF impact wave sound head with measured frequency decreasing as thickness of plate assembly increases |
Non-Patent Citations (3)
Title |
---|
Patents Abstracts of Japan, Vol. 11, No. 120, 23.4.87 * |
Patents Abstracts of Japan, Vol. 14, No. 405, 31.8.90 * |
Soviet Invention Illustrated, SUS, p. 4, 27.4.83 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2199786B1 (en) * | 2008-12-18 | 2021-10-20 | NUOVO PIGNONE INTERNATIONAL S.r.l. | Ultrasound inspection methods for noisy cast materials and related probes |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8100 | Publication of the examined application without publication of unexamined application | ||
D1 | Grant (no unexamined application published) patent law 81 | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: DEUTSCHE AEROSPACE AG, 8000 MUENCHEN, DE |
|
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: DAIMLER-BENZ AEROSPACE AKTIENGESELLSCHAFT, 80804 M |
|
8339 | Ceased/non-payment of the annual fee |