Different types non-destructive testing methods
                     FALCON  
LABORATORY
Different types non-destructive testing methods 
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1. Acoustic Emission 
Testing (AE) 
 This testing technique utilizes an electric flow or magnetic field 
which is gone through a conductive part. There are three kinds of 
electromagnetic testing, including eddy current testing, alternating 
current field estimation (ACFM) and remote field testing (RFT). 
Eddy current testing utilizes an exchanging current coil to initiate 
an electromagnetic field into the test piece, alternating current 
field estimation and remote field testing both utilize a test to 
present a magnetic field, with RFT generally used to test pipes. 
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2. Ground Penetrating Radar (GPR) 
 This geophysical NDT technique sends radar beats through the 
outside of a material or subsurface structure, for example, rock, 
ice, water or soil. The waves are reflected or refracted when they 
experience a covered object or material limit with various 
electromagnetic properties. 
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3. Laser Testing Methods 
(LM) 
 Laser testing falls into three classifications including holographic 
testing, laser profilometry and laser shearography. Holographic 
testing utilizes a laser to recognize changes in the surface of the 
material which has been exposed to pressure, for example, warmth, 
weight or vibration. The results are then compared with a whole 
reference sample to show defects. Laser profilometry utilizes a fast 
pivoting laser light source and small scale optics to detect corrosion, 
pitting, disintegration and cracks by identifying changes in the surface 
by means of a 3D picture generated from the surface geography. 
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4. Leak Testing (LT) 
 Leak testing can be separated into four distinct strategies - bubble 
spill testing, pressure change testing, halogen diode testing, and mass 
spectrometer testing. Bubble leak testing utilizes a tank of fluid, or a 
soap solution for bigger parts, to distinguish gas (typically air) leaking 
from the test piece as bubbles. Just utilized on closed systems, 
pressure change testing utilizes either pressure or a vacuum to screen 
the test piece. A deficiency of pressure or vacuum over a set time 
span will show that there is a leak in the system. 
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