www.davidson.com.au - UE Systems Ultrasonic Detection Applications

DESCRIPTION
Aircraft have many systems that can be checked ultrasonically. Some of the more common applications include: testing leaks in fuel calls, oxygen systems, hot air ducts, cabin pressure, tire leaks, floatation devices, hydraulic valves and actuators. It is also used to locate leaks in cockpit windows as well as to locate problems with bearings, pumps, motors and gears.

How Ultrasonic Detection Works
Operating systems such as compressed gas systems, valves, motors, pumps, etc., all produce ultrasound. Some high frequency sounds are generated from turbulence, others from friction. As components begin to wear, fail or leak, there is a change in the normal ultrasonic pattern. this can be detected as an increase in amplitude, a change in sound quality or a change in sound pattern. Due to portability, ease of use and flexibility any Ultraprobe may be used all around the aircraft.

The Ultraprobe detects minute changes in ultrasound and converts these signals so that they may be heard through headphones, and observed as intensity increments on a meter. By using plug-in modules for either a scanning mode or a contact mode, equipment may be inspected for leakage or for mechanical problems. Due to its portability and its' rating of Intrinsically Safe, class 1, Division 1, Groups A, B, C, & D, the Ultraprobe may be used all around the aircraft.

Detection Methods
For general leak detection, in a scanning mode, move along the area to be tested with the sensitivity at high and, using a slight waving motion, listen for the loudest "hissing" sound and follow the sound to the loudest point. Use the patented Warble Tone Generator to test for cabin pressure and cockpit window leaks in the same manner. The only difference will be the sound, which is heard as a distinctive chirp. For valves and actuators, touch upstream and reduce the sensitivity to a mid-line reading. Compare with the downstream reading. Test bearings and mechanical equipment by reducing the sensitivity first and then tune the frequency until the desired mechanical sound is heard. Compare readings over time for trending. It's that simple.

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