What is the primary use of EDM notches in a rectangular prism reference reflector?

The primary use of EDM (Electrical Discharge Machining) notches in a rectangular prism reference reflector is to serve as a means of assessing and calibrating sensitivity in ultrasonic testing. These notches provide specific, controlled discontinuities within the material, which can be used to verify and adjust the sensitivity of the phased array system.

When performing ultrasonic testing, it is crucial to ensure that the system is responsive to small flaws or discontinuities. The EDM notches, being precisely machined, create known reflectors that help in determining the minimum level of signal that can be detected. This is fundamental in evaluating the system’s performance and ensuring that it can reliably identify real defects in test specimens. By comparing the signals received from these notches, technicians can establish the baseline sensitivity of their equipment.

In summary, EDM notches are essential for calibrating and verifying the sensitivity of inspection equipment, making them a vital component in maintaining quality assurance in ultrasonic testing.