Custom Lithium Niobate Transducer Arrays for Detecting Material Distribution of Hybrid Workpieces

2015 ◽  
Vol 0 (0) ◽  
Author(s):  
Kai-Alexander Saalbach ◽  
Marc Christopher Wurz ◽  
Jens Twiefel ◽  
Lutz Rissing ◽  
Jörg Wallaschek
Keyword(s):  
Lithium Niobate ◽  
Transit Time ◽  
Elevated Temperatures ◽  
Material Distribution ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Transducer Arrays ◽  
In Transit ◽  
Non Destructive

AbstractUltrasonic non-destructive testing is presented as a method to determine differences in material distribution at elevated temperatures in hybrid workpieces made of different metals. Varying material distribution causes differences in transit time and can be detected by ultrasonic transit time measurements. Therefore, custom transducers are manufactured to perform transit time measurements on hybrid workpieces. Results of these measurements are shown.

Контроль и определение параметров сварной низкоуглеродистой стали E 6013 с помощью ультразвукового контроля и преобразования Гильберта—Хуанга

2021 ◽  
pp. 64-70
Author(s):  
Аиша Халид ◽  
М.Газанфар Али ◽  
Тарик Майрадж Русул Хан ◽  
Мухаммад Имран ◽  
Салман Низар ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ultrasonic Testing ◽  
Elevated Temperatures ◽  
Quantitative Relation ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Hilbert Huang Transform ◽  
Processing Techniques ◽  
Non Destructive

All welded parts undergo aging once operated at elevated temperatures. Exposures of structures on elevated temperatures adversely affect the material performance and deteriorate the structure’s toughness. The welded part also develops the high risk of brittle fracture. In order to establish the fracture toughness, it is not always possible to remove the specimen from the service. Therefore, it is desirable to develop an In-situ Non-destructive testing (NDT) based on Ultrasonic Testing (UT) method along with advanced signal processing techniques. Ultrasonic Testing (UT) is an extensively used Non-destructive testing technique that offers improved damage detection capability. The objective of the study is to found a quantitative relation between UT and mechanical properties of welded joint heat treated specimens. The data was acquired from the testing of weld specimens at different levels of temperatures through UT testing. There is a trend observed between the variation in the UT signal’s characteristics i.e. attenuation and the variation in the mechanical properties. The likely categorization of UT signal in terms of different thermal aging levels has also been explored using Hilbert Huang Transform (HHT) on acquired UT signals. The experimental relationships will enable welded specimen toughness prediction solely through in-situ UT testing while the specimen will remain in service.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive

Modeling of a sensitive element on a planar mushroom-shaped metamaterial for non-destructive testing and searching for inhomogeneities in technological media

2020 ◽  
pp. 54-59
Author(s):  
A. A. Yelizarov ◽  
A. A. Skuridin ◽  
E. A. Zakirova
Keyword(s):  
Sensitive Element ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Resonant Frequency Shift ◽  
Maltese Cross ◽  
Informative Parameters ◽  
Non Destructive ◽  
Cross Type ◽  
Electrodynamic Structure ◽  
Electrophysical Parameters

A computer model and the results of a numerical experiment for a sensitive element on a planar mushroom-shaped metamaterial with cells of the “Maltese cross” type are presented. The proposed electrodynamic structure is shown to be applicable for nondestructive testing of geometric and electrophysical parameters of technological media, as well as searching for inhomogeneities in them. Resonant frequency shift and change of the attenuation coefficient value of the structure serve as informative parameters.

STUDY OF HOMOGENEITY, POROSITY AND INTERNAL DEFECTS IN AERATED AND EPS AGGREGATE POLY BRICKS USING NEUTRON RADIOGRAPHY TECHNIQUE

2015 ◽  
Vol 7 (2) ◽  
pp. 1428-1439
Author(s):  
Khurshed Alam ◽  
Md. Sayeedur Rahman ◽  
Md. Mostafizur Rahman ◽  
S. M. Azaharul Islam
Keyword(s):  
Optical Density ◽  
Neutron Radiography ◽  
Density Variation ◽  
Expanded Polystyrene ◽  
Elemental Distribution ◽  
Non Destructive Testing ◽  
Internal Defects ◽  
Destructive Testing ◽  
Radiographic Images ◽  
Non Destructive

A powerful non-destructive testing (NDT) technique is adopted to study the internal defects and elemental distribution/homogeneity and porosity of aerated brick and EPS aggregate poly brick samples. In the present study the internal defects like homogeneity, porosity, elemental distribution, EPS aggregate and aerator distributor in the test samples have been observed by the measurement of gray value/optical density of the neutron radiographic images of these samples. From this measurement it is found that the neutron intensity/optical density variation with the pixel distance of the AOI of the NR images in both expanded polystyrene (EPS) aggregate poly brick and aerated brick samples comply almost same in nature with respect to the whole AOI but individually each AOI shows different nature from one AOI to another and it confirms that the elemental distribution within a AOI is almost homogeneous. Finally it was concluded that homogeneity, elemental distribution in the EPS aggregate poly brick sample is better than that of the aerated brick sample. 

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