Ultrasonic test sets are used in the aviation industry for ultrasonic inspection. Ultrasonic inspection can be defined as a form of non-destructive testing during maintenance. During ultrasonic inspection, test sets project a high frequency of sound energy to detect flaws and to characterize material of equipment being tested. Ultrasonic test sets can be used to test the following parts:
- Bonded Structures
- Lap Joints
- Landing Gear
- Engine Components
- Raw Materials
HOW ULTRASONIC INSPECTION WORKS
During ultrasonic inspection, test sets generate high voltage electric pulses. These pulses then get converted into high frequency energy by a transducer, which directs the energy to form sound waves. The sound waves aid in detecting a flaw within the part being tested. When the sound waves detect a defect, part of the ultrasonic energy reflects back from the flaw surface. This reflection then transforms back into an electrical signal with the help of the transducer, which then displays the flaw on the ultrasonic test set’s screen.
Notably, ultrasonic inspection can only be performed when a liquid is present. It can’t be performed with just air. If a liquid substance is not present, ultrasonic energy will not be able to transfer between the transducer and the part being tested.
ULTRASONIC TEST SET CALIBRATION
Ultrasonic inspection is known to be highly accurate, however it is important to ensure that the test set used during inspection is properly setup and calibrated. Ultrasonic test sets that have not be calibrated or have not been set up correctly could led to severe destruction and inaccurate measurements. It is also vitally important for the technician performing the test to be competent and knowledgeable in ultrasonic inspection.