Alternating Current Field Measurement (ACFM) is a non-destructive testing technique used to detect and measure surface-breaking cracks and defects in materials such as metals. It works by inducing an alternating current into the material being tested, generating a magnetic field around the crack or defect. A probe is then used to measure the changes in the magnetic field caused by the crack, allowing for precise detection and measurement of the defect.
ACFM is particularly effective at detecting defects that are difficult to find using traditional techniques, such as cracks that are not visible on the surface or are located in hard-to-reach areas. It is commonly used in industries such as aerospace, oil and gas, and manufacturing to ensure the safety and reliability of critical components.
Overall, ACFM is a powerful tool for non-destructive testing that offers high sensitivity and accuracy in detecting and measuring surface defects in a wide range of materials.