DE2632323C3 - Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves - Google Patents
Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb wavesInfo
- Publication number
- DE2632323C3 DE2632323C3 DE19762632323 DE2632323A DE2632323C3 DE 2632323 C3 DE2632323 C3 DE 2632323C3 DE 19762632323 DE19762632323 DE 19762632323 DE 2632323 A DE2632323 A DE 2632323A DE 2632323 C3 DE2632323 C3 DE 2632323C3
- Authority
- DE
- Germany
- Prior art keywords
- plate thickness
- transmitter
- sheet metal
- pulse
- metal strip
- 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
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear 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
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
- G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
-
- 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
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
-
- 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
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
Description
Die Erfindung betrifft eine Vorrichtung zur Ultraschallprüfung von plattenförmigen Körpern, insbesondere Blechband, nach dem Impuls-Echo-Verfahren mit Lambwellen, bestehend aus einem einen Sender und einen Empfänger aufweisenden Ultraschailprüfkopf, wobei die konstante Frequenz eines Ultraschallschwingers für den Sender und für den Empfänger für jeweils einen anderen Plattendickenbereich so gewählt wird, daß das Produkt aus der Frequenz und dem zugeordneten Plattendickenbereich im wesentlichen konstant ist.The invention relates to a device for ultrasonic testing of plate-shaped bodies, in particular Sheet metal strip, using the pulse-echo method with Lamb waves, consisting of a one Transmitter and a receiver having ultrasonic test head, where the constant frequency of an ultrasonic oscillator for the transmitter and for the Receiver for a different plate thickness range is chosen so that the product of the frequency and the associated plate thickness range is substantially constant.
Bei einer bekannten Vorrichtung dieser Art (das Industrieblatt, Stuttgart, Oktober 1958, Seiten 427 und 428) werden für die verschiedenen Plattendikkenbereiche offensichtlich unterschiedliche Ultraschallprüfköpfe mit jeweils entsprechend angepaßten Schwingerfrequenzen bereitgestellt. Eine niedrigste mögliche gleichbleibende Fehlernachweisgrenze für alle Plattendicken ist hierbei nicht gewährleistet. Das gilt auch dann, wenn bei Anwendung der Grundwelle das Produkt aus Frequenz und Plattendicke im Lambwellenbereich oberhalb etwa 80 kHz · cm liegt (das Industrieblatt, Stuttgart, Januar 1960, Seiten 1 bis 7).In a known device of this type (the Industrieblatt, Stuttgart, October 1958, pages 427 and 428) will obviously have different ultrasonic probes for the different plate thickness ranges provided with correspondingly adapted oscillator frequencies. A lowest a possible constant defect detection limit for all panel thicknesses is not guaranteed. That also applies if the product of frequency and plate thickness is in the Lamb wave range when the fundamental wave is used above about 80 kHz · cm (the Industrieblatt, Stuttgart, January 1960, pages 1 to 7).
Der Erfindung liegt die Aufgabe zugrunde, anzugeben, wie man mit einer gattungsgemäßen Vorrichtung für alle Plattendicken eine niedrigst mögliche gleichbleibende Fehlernachweisgrenze sicherstellen kann.The invention is based on the object of specifying how to use a generic device can ensure the lowest possible constant defect detection limit for all panel thicknesses.
Zur Lösung dieser Aufgabe lehrt die Erfindung, daß der Sender und der Empfänger je aus einer Mehrzahl von jeweils einem anderen Plattendickenbereich zugeordneten Schwingern besteht, die jeweils an den regelmäßig zugeordneten Innenflächen eines Vieleckhohlkörpers rechteckigen Querschnitts befestigt und vermittels eines den Vieleckkörper drehenden Verstellantriebs in Sende- bzw. Empfangslage verstellbar sind.To solve this problem, the invention teaches that the transmitter and the receiver each consist of a plurality consists of vibrators assigned to a different plate thickness range, each of which is attached to the regularly assigned inner surfaces of a polygonal hollow body of rectangular cross-section attached and adjustable by means of an adjusting drive rotating the polygonal body in the transmitting or receiving position are.
Die durch die Erfindung erreichten Vorteile sind darin zu sehen, daß unterschiedliche Plattendicken mit einem einzigen Ultraschallprüfkopf und optimalen Bedingungen geprüft werden können, weil die den unterschiedlichen Plattendickenbereichen zugeordneten Schwinger stets in gleiche Sende- bzw. Empfangslage gebracht werden. Die Handhabung ist sehr einfach, da der Verstellantrieb sowohl die Schwinger des Senders, als auch die Schwinger des gleich aufgebauten Empfängers verstellt.The advantages achieved by the invention can be seen in the fact that different plate thicknesses with a single ultrasonic probe and optimal conditions can be tested because the Oscillators assigned to different plate thickness ranges always in the same sending or receiving position to be brought. Handling is very easy, as the adjustment drive is both the oscillator of the transmitter as well as the transducers of the identical receiver.
Nach einer bevorzugten Ausführungsform der Erfindung besteht das Produkt aus Frequenz und Plattendicke aus dem Grundwellenbereich zwischen 90 und 160 kHz · cm. Hiermit läßt sich für jeden Plattendickenbereich unter Einsatz der geringst möglichen Zahl von Schwingern lückenlos eine optimale Ultraschallprüfung durchführen.According to a preferred embodiment of the invention, the product consists of frequency and plate thickness from the fundamental wave range between 90 and 160 kHz · cm. This allows for every plate thickness range using the smallest possible number of transducers, an optimal ultrasonic test without gaps carry out.
Im folgenden wird die Erfindung anhand einer ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert.In the following, the invention is explained in more detail with reference to a drawing showing an exemplary embodiment explained.
Die einzige Figur zeigt schematisch einen Schnitt durch eine Vorrichtung zur Ultraschallprüfung von Blechband 1 mit einer Dicke von 1 bis 10 mm nach dem Impuls-Echo-Verfahren mit Lambwellen. Sie besteht in ihrem grundsätzlichen Aufbau zunächst aus einem Ultraschallprüfkopf mit einem Sender 2 und einem identisch aufgebauten Empfänger, der in der Figur nicht zu erkennen ist, weil er hinter dem Sender 2 angeordnet ist. Der Sender 2 ist in einem mit Wasser 3 gefüllten Gehäuse 4 mit einem Ankopplungsfenster 5 untergebracht.The single figure shows schematically a section through a device for ultrasonic testing of Sheet metal strip 1 with a thickness of 1 to 10 mm according to the pulse-echo method with Lamb waves. she consists in its basic structure initially of an ultrasonic probe with a transmitter 2 and an identically constructed receiver, which cannot be seen in the figure because it is behind the transmitter 2 is arranged. The transmitter 2 is in a housing 4 filled with water 3 with a coupling window 5 housed.
Der Sender 2 besteht im Ausführungsbeispiel aus sechs Schwingern 6a-/ unterschiedlicher konstanter Frequenz. Welcher Schwinger mit welcher Frequenz welchem Dickenbereich zugeordnet ist, kann der nachfolgenden Tabelle entnommen werden:In the exemplary embodiment, the transmitter 2 consists of six oscillators 6a / different constant ones Frequency. Which transducer is assigned to which thickness range with which frequency, can can be found in the following table:
Wie unschwer überprüft werden kann, ist für alle Schwinger 6a-f das Produkt aus Frequenz und Dikkenbereich relativ konstant und liegt dieses Produkt im günstigen Grundwellenbereich zwischen 90 und 160 kHz cm.As can easily be checked, the product of frequency and thickness range is relatively constant for all transducers 6a-f and this product lies in the favorable fundamental wave range between 90 and 160 kHz cm.
Die Schwinger 6a—f sind auf die regelmäßig angeordneten Innenflächen eines Sechseckhohlkörpers 7 rechteckigen Querschnittes aufgekittet und vermittels eines den Sechseckhohlkörper 7 drehenden Verstellantriebes 8 in Sendelage bi ingbar. Die in Sendelage befindlichen Schwinger, im Ausführungsbeispiel 6/, erzeugen durch das Ankopplungsfenster 5 immer unter dem gleichen Winkel einen Longitudinalwellenzug zur Anregung einer Plattenwelle in dem Blechband 1. An dessen Oberfläche zurückgestrahlte Ultraschallanteile werden durch einen hinter dem Ankopplungsfenster 5 im Gehäuse 4 befindlichen Dämpfungsköirper 9 absorbiert, um störende Überkopplungen zu vermeiden.The oscillators 6a-f are cemented onto the regularly arranged inner surfaces of a hexagonal hollow body 7 of rectangular cross-section and can be locked into the transmitting position by means of an adjusting drive 8 rotating the hexagonal hollow body 7. The transducers in the transmitting position, in the exemplary embodiment 6 /, always generate a longitudinal wave train through the coupling window 5 at the same angle to excite a plate wave in the sheet metal strip 1. Ultrasonic components that are radiated back on its surface are absorbed by a damping body 9 located behind the coupling window 5 in the housing 4 absorbed in order to avoid annoying cross-coupling.
Hierzu i tjiait ZeichnungenFor this purpose i tjiait drawings
Claims (2)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762632323 DE2632323C3 (en) | 1976-07-17 | 1976-07-17 | Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves |
| IT2566777A IT1084949B (en) | 1976-07-17 | 1977-07-13 | DEVICE FOR THE ULTRASONIC CONTROL BY PLATE-SHAPED BODIES, IN PARTICULAR FOR SHEET METAL TAPES, ACCORDING TO THE LAMB WAVE-IMPULSE-ECO PROCEDURE |
| JP8306977A JPS5312386A (en) | 1976-07-17 | 1977-07-13 | Ultrasonic flaw detector for inspecting plateelike objects*particularly strips by using lambert wave pulse echo method |
| FR7721628A FR2358658A1 (en) | 1976-07-17 | 1977-07-13 | Ultrasonic testing device for metal strips - has oscillators for different strip thicknesses with constant prod. of frequency by corresponding thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762632323 DE2632323C3 (en) | 1976-07-17 | 1976-07-17 | Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2632323A1 DE2632323A1 (en) | 1978-01-26 |
| DE2632323B2 DE2632323B2 (en) | 1978-06-22 |
| DE2632323C3 true DE2632323C3 (en) | 1979-02-22 |
Family
ID=5983321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19762632323 Expired DE2632323C3 (en) | 1976-07-17 | 1976-07-17 | Device for ultrasonic testing of plate-shaped bodies, in particular sheet metal strip, using the pulse-echo method with Lamb waves |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5312386A (en) |
| DE (1) | DE2632323C3 (en) |
| FR (1) | FR2358658A1 (en) |
| IT (1) | IT1084949B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5712329A (en) * | 1980-06-25 | 1982-01-22 | Hitachi Ltd | Frost sensor |
| FR2538155B1 (en) * | 1982-12-17 | 1988-08-12 | Fragema Framatome & Cogema | METHOD AND DEVICE FOR DETECTING DEFECTIVE FUEL ELEMENTS USING ULTRASONIC ABSORPTION |
| GB8509836D0 (en) * | 1985-04-17 | 1985-05-22 | Rolls Royce | Transient stress wave events |
| JPS6443712A (en) * | 1987-08-11 | 1989-02-16 | Nippon Telegraph & Telephone | Automatic level measuring instrument |
| JP4717338B2 (en) * | 2003-08-29 | 2011-07-06 | 株式会社三葉製作所 | Non-contact temperature measurement system |
-
1976
- 1976-07-17 DE DE19762632323 patent/DE2632323C3/en not_active Expired
-
1977
- 1977-07-13 IT IT2566777A patent/IT1084949B/en active
- 1977-07-13 FR FR7721628A patent/FR2358658A1/en not_active Withdrawn
- 1977-07-13 JP JP8306977A patent/JPS5312386A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2358658A1 (en) | 1978-02-10 |
| DE2632323A1 (en) | 1978-01-26 |
| JPS5312386A (en) | 1978-02-03 |
| DE2632323B2 (en) | 1978-06-22 |
| IT1084949B (en) | 1985-05-28 |
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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 |