Electromagnetic Testing Chapter 3- Electromagnetic Testing

3.16 USE OF COMPUTERS
New multifrequency systems pose new calibration and data-handling
problems. Each test frequency represents two key variables, phase and
amplitude. In addition, each application is certain to introduce several
unwanted parameters associated with inherent noise; these parameters must
be suppressed to increase test reliability.The overall effect of computerization
is to eliminate the number of subjective judgments an inspector has to make
when dealing with a multifrequency, multiphase system.
Ideally, we would input the test variables into a computer, push a start button,
and then take a coffee break. Meanwhile, the computer would detect flaws
and discontinuities, determine their number and severity, and mark them.
Finally, a robot would separate the good and bad parts and stack them in
neat piles. All of this would be accomplished at high speed with a 99.9% or
better yield rate.
Charlie Chong/ Fion Zhang