Evaluation of Parameter Significance

摘要

All NDT inspections use models. The number and type of models will varybetween inspections. A qualified inspection will use a PoD model to evaluatedetection capabilities. All techniques have some degree of calibration. Somecalibration processes generate curves that are simple models.Parameters are the building blocks of models. Models can be generated tounderstand what happens to the results of an inspection when parameterschange. Not all parameter variation will cause a decrease in a system’sdetection capability. For example, an increase in an indication’s length willlikely increase the chance of detection.Each variable or parameter involved in an inspection has natural variations.These variations will affect an inspection with different degrees. Evaluatingwhen a change is significant becomes an important aspect in developingsound inspection techniques. This article addresses several techniques usedto determine significance in changes between measurements.