scholarly journals The effect of the diameter of the detector collimator on saturation thickness in gamma scattering measurement

2017 ◽  
Vol 1 (T3) ◽  
pp. 68-78
Author(s):  
Chuong Dinh Huynh ◽  
Nguyen Hoang Vo ◽  
Trang Thi Ngoc Le ◽  
Linh Thi Truc Nguyen ◽  
Tuyet Kim Tran ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Incident Angle ◽  
Target Thickness ◽  
Processing Technique ◽  
Scattering Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Saturation Thickness ◽  
Non Destructive ◽  
Scattering Measurement

The effect of the diameter of the detector collimator on the saturation thickness in gamma-scattering measurements is studied using the spectrum of singly scattering. Geometric arrangement of gamma-scattering measurement includes: a gamma-ray collimated beam with the energy of 662 keV emitted from 137Cs source is irradiated on a rectangular aluminium target with incident angle of 90o, and detector NaI(Tl) 5.1cmx5.1cm with collimator is used to record the scatterd gamma rays at scattered angle of 120°. The experimental measurements are carried out to obtain scattered spectra with various target thickness and diameter of detector collimator. The profile of the singly scattering and multiply scattering in the scattered spectra are determined by a spectrum processing technique based on the least squares fitting. The experimental results showed that the saturation thickness of the counts of singly scattering increases with increasing the window diameter of the detector collimator. These results will support for the non-destructive testing research of application of gamma-scattering method to determine the thickness or the defect of the sample.

scholarly journals Defect Estimation in Non-Destructive Testing of Composites by Ultrasonic Guided Waves and Image Processing

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 315 ◽  
Author(s):  
Kumar Anubhav Tiwari ◽  
Renaldas Raisutis ◽  
Olgirdas Tumsys ◽  
Armantas Ostreika ◽  
Kestutis Jankauskas ◽  
...  
Keyword(s):  
Image Processing ◽  
Composite Structures ◽  
Guided Waves ◽  
Low Frequency ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Discrete Wavelet ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

The estimation of the size and location of defects in multi-layered composite structures by ultrasonic non-destructive testing using guided waves has attracted the attention of researchers for the last few decades. Although extensive signal processing techniques are available, there are only a few studies available based on image processing of the ultrasonic B-scan image to extract the size and location of defects via the process of ultrasonic non-destructive testing. This work presents an image processing technique for ultrasonic B-scan images to improve the estimation of the location and size of disbond-type defects in glass fiber-reinforced plastic materials with 25-mm and 51-mm diameters. The sample is a segment of a wind turbine blade with a variable thickness ranging from 3 to 24 mm. The experiment is performed by using a low-frequency ultrasonic system and a pair of contact-type piezoceramic transducers kept apart by a 50-mm distance and embedded on a moving mechanical panel. The B-scan image acquired by the ultrasonic pitch-catch technique is denoised by utilizing features of two-dimensional discrete wavelet transform. Thereafter, the normalized pixel densities are compared along the scanned distance on the region of interest of the image, and a −3 dB threshold is applied to the locations and sizes the defects in the spatial domain.

High resolution gamma ray tomography scanner for flow measurement and non-destructive testing applications

2007 ◽  
Vol 78 (10) ◽  
pp. 103704 ◽  
Author(s):  
U. Hampel ◽  
A. Bieberle ◽  
D. Hoppe ◽  
J. Kronenberg ◽  
E. Schleicher ◽  
...  
Keyword(s):  
High Resolution ◽  
Flow Measurement ◽  
Gamma Ray ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
High Resolution Gamma

Defect Depth of Thermal Non-Destructive Testing for the Titanium Implants

2013 ◽  
Vol 815 ◽  
pp. 786-789
Author(s):  
Qi Fang Zhu ◽  
Ze Ming Sun ◽  
Tong Da Ma ◽  
Pu Li ◽  
Zhi Gang Fan ◽  
...  
Keyword(s):  
Processing Technique ◽  
Titanium Implants ◽  
Test Results ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Depth Images ◽  
Bottom Hole ◽  
Hole Defects ◽  
Non Destructive ◽  
Data Processing Technique

In this paper, the results of the first-stage research devoted to infrared thermographic detection of cracks in titanium alloys are presented. In application to the inspection of bottom-hole defects in 9.6 mm-thick Ti6Al4V titanium alloy samples, it has been found that a minimum detected defect should have diameter from one to two times greater than its depth. Images of phase are more noise-resistant and able to reveal deeper defects compared to images of amplitude. The test results obtained show that the Fourier analysis is a convenient data processing technique in active thermal NDT.

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