What instrument is typically used to display results in ultrasonic testing?

In ultrasonic testing (UT), the instrument that is most commonly used to display results is the ultrasonic flaw detector. This device is specifically designed to send pulses of ultrasonic waves into a material and analyze the reflected signals that come back. By measuring the time it takes for these waves to return and their characteristics, the flaw detector can identify flaws, evaluate material thickness, and gather other important data about the structure being tested.

Ultrasonic flaw detectors typically feature screens that provide visual representations of the data, allowing technicians to interpret the results effectively. This includes graphical displays that show amplitude and time, which help in quantifying the size and location of any imperfections found within the material.

The other instruments mentioned, such as frequency generators, laser scanners, and magnetic flux leakage devices, serve different purposes. Frequency generators are used to create the ultrasonic waves, but they do not analyze or display results. Laser scanners are used primarily in 3D scanning applications, not for ultrasonic testing. Magnetic flux leakage devices are for testing ferromagnetic materials and are not applicable in the context of ultrasonic testing. Thus, the ultrasonic flaw detector is the correct choice as it is specifically designed for the tasks associated with ultrasonic testing.