In eddy current testing using the ellipse method, how may one variable be indicated?

In eddy current testing using the ellipse method, one variable is represented by the size of the ellipse opening. This method relies on interpreting the geometric representation of eddy current signals in the form of an ellipse on a display. The size of the opening of the ellipse corresponds to the magnitude of a specific parameter being measured, such as conductivity or material thickness. When defects or changes in material properties occur, they can cause variations in the eddy current response, leading to changes in the size of the ellipse. By analyzing these changes, inspectors can determine the presence and severity of flaws within the test material.

Understanding the significance of the size of the ellipse opening is crucial for making accurate assessments in eddy current testing and helps in quantifying the characteristics of the material or any potential defects.