ULTRASONIC
TESTING
Ultrasonic testing involves a digital
instrument which utilizes and measures sound waves transmitted and reflected
to measure material thickness and continuity. The most commonly used ultrasonic
testing technique is pulse echo, whereby pulsed beams of high frequency ultrasound
from a transducer are directed at the test object and reflections (echoes)
from internal imperfections, or the part's geometrical surfaces, are returned
to a receiver. A screen is used to display graphs of the amplitude and the
time taken for the pulse to return. Changes in the signal are indicative of
varying material thicknesses, or in the absence of this, a defect. Ultrasonic
testing is often used to compare specimens that should be identical - if one
gives a different sonic signature, it may be because of the presence of a
defect. These graphs are retained and downloaded to our field computer.
Ultrasonic testing involves a digital
instrument which utilizes and measures sound waves transmitted and reflected
to measure material thickness and continuity. The most commonly used ultrasonic
testing technique is pulse echo, whereby pulsed beams of high frequency ultrasound
from a transducer are directed at the test object and reflections (echoes)
from internal imperfections, or the part's geometrical surfaces, are returned
to a receiver. A screen is used to display graphs of the amplitude and the
time taken for the pulse to return. Changes in the signal are indicative of
varying material thicknesses, or in the absence of this, a defect. Ultrasonic
testing is often used to compare specimens that should be identical - if one
gives a different sonic signature, it may be because of the presence of a
defect. These graphs are retained and downloaded to our field computer. 
