What is the primary purpose of using a magnetograph in magnetic particle inspection?

The primary purpose of using a magnetograph in magnetic particle inspection is to visualize magnetic fields. This visualization is crucial because it helps the inspector understand how the magnetic field interacts with the component being tested and where magnetic leakage occurs. By displaying the magnetic field lines, a magnetograph enables the identification of critical areas where flaws such as cracks or other discontinuities may exist. This visualization is essential in magnetic particle inspection, as it allows for better interpretation of test results and enhances the overall effectiveness of the inspection process.

Other options focus on aspects that are either not directly related to the purpose of a magnetograph or fall outside the primary functions in magnetic particle inspection. For example, measuring magnetic field strength is important in understanding magnetic properties, but it is not the main function of a magnetograph itself. Similarly, assessing magnet material properties and inspecting for dimensional accuracy are not tasks performed by a magnetograph in the context of magnetic particle inspection.