NDT Methods: Ultrasonic
Ultrasonic May be defined as sound with a pitch too high to be
detected by the human ear. Frequencies of 25 kilohertz to 25
megahertz are commonly used.
Ultrasonic testing is an excellent method for the exact measurement of material thickness and is well utilized in inspection systems involving corrosion control. Due to its ability to detect subsurface discontinuities, it can be utilized to determine accurately dimensional considerations regarding exact location of flaws and flaw size in a wide variety of materials.
The equipment is electronic, utilizing an oscilloscope with complex circuitry along with a transducer that transmits sound by mechanical vibrations into a material and records the time it takes for the sound to travel through the material and return