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. 

scholarly journals Quality study of hand made brick-DK using neutron radiography technique

2014 ◽  
Vol 48 (4) ◽  
pp. 237-246
Author(s):  
MK Alam ◽  
MR Islam ◽  
S Saha ◽  
MN Islam ◽  
SM Azaharul Islam
Keyword(s):  
Neutron Radiography ◽  
Raw Materials ◽  
High Water ◽  
Middle Part ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Radiographic Images ◽  
Beam Port ◽  
Rapid Absorption ◽  
Non Destructive

Neutron radiography is a powerful non-destructive testing (NDT) technique for internal evaluation of materials, such as voids/cavity, cracks, homogeneity, water absorption behavior, etc. It involves attenuation of a neutron beam by an object to be radiographed and thus to make the registration of the attenuation process (as an image) on a film or video. In the present investigation neutron radiography (NR) imaging technique has been adopted to study the quality like homogeneity, porosity, water penetrating height, behavior of incremental intrusion area, initial rapid absorption (IRA) of the brick-DK sample. Thermal neutron radiography facility installed at the tangential beam port of 3MW TRIGA MARK-II reactor is used in this study. In this cases optical density or gray values of the neutron radiographic images of the sample is measured. From this measurement it is found that the contents of the sample is not uniformly distributed all over the sample which indicates the presence of large number of internal porosity, at the two edges water uptake is slightly poorer than the middle part and initial rapid absorption is very high. Water penetrating inside the sample is faster. The results obtained and conclusion made in this study can only be compared to the properties of bricks produced under similar conditions with similar raw materials. DOI: http://dx.doi.org/10.3329/bjsir.v48i4.18273 Bangladesh J. Sci. Ind. Res. 48(4), 237-246, 2013

scholarly journals Evaluating the performance of various segmentation techniques in industrial radiographs

2014 ◽  
Vol 14 (1) ◽  
pp. 161-171
Author(s):  
Mythili Thirugnanam ◽  
S. Margret Anouncia
Keyword(s):  
Image Processing ◽  
Region Of Interest ◽  
Non Destructive Testing ◽  
Gray Scale ◽  
Destructive Testing ◽  
Radiographic Images ◽  
Segmentation Algorithms ◽  
Industrial Inspection ◽  
Pros And Cons ◽  
Non Destructive

Abstract At present, image processing concepts are widely used in different fields, such as remote sensing, communication, medical imaging, forensics and industrial inspection. Image segmentation is one of the key processes in image processing key stages. Segmentation is a process of extracting various features of the image which can be merged or split to build the object of interest, on which image analysis and interpretation can be performed. Many researchers have proposed various segmentation algorithms to extract the region of interest from an image in various domains. Each segmentation algorithm has its own pros and cons based on the nature of the image and its quality. Especially, extracting a region of interest from a gray scale image is incredibly complex compared to colour images. This paper attempts to perform a study of various widely used segmentation techniques in gray scale images, mostly in industrial radiographic images that would help the process of defects detection in non-destructive testing.

NDT Analysis of Metal Materials with Internal Defects Using Active Infrared Thermography Method

2006 ◽  
Vol 321-323 ◽  
pp. 835-840 ◽  
Author(s):  
Won Tae Kim ◽  
Man Yong Choi ◽  
Jung Hak Park
Keyword(s):  
Infrared Thermography ◽  
Thermal Imaging ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Internal Defects ◽  
Destructive Testing ◽  
Active Infrared Thermography ◽  
Thermal Patterns ◽  
Metal Materials ◽  
Non Destructive

This study is aimed to analyze the thermal imaging patterns presented by infrared(IR) thermography at which the metal with internal defects are thermally heated. Through the knowledge of non-destructive testing which infrared thermography can be applied to detect the defects inside the materials, there are two materials experimented; one is stainless steel and the other is cast-iron. Thermally, each material of specimens is heated at the base of the material and kept with constant temperature, The artificial defects in the specimen are formulated. Under the shape and location of the defects, temperature profiles are also measured and validated using the computer simulation. It is concluded that the characteristics of thermal patterns obtained from IR thermography are consistent with those of measurement and computations.

Non-destructive Testing of Internal Defects in composite post insulators Using Microwave Technique

2021 ◽  
Author(s):  
Xiying Wang ◽  
Zhidong Cheng ◽  
Li Cheng ◽  
Lijun Yang ◽  
Ruijing Liao ◽  
...  
Keyword(s):  
Non Destructive Testing ◽  
Internal Defects ◽  
Destructive Testing ◽  
Microwave Technique ◽  
Non Destructive
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