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The method for detecting leaks with ultrasonics is simple and straightforward. An inspector scans the lines, listening for the distinct airborne sounds that signal compressed air leaks. Continuously adjusting the instruments sensitivity/volume control, he follows the line until the loudest point is heard. Since ultrasound is a short wave signal, an inspector can discriminate between irrelevant background noises and actual leak signal.
Ultrasonic detectors not only provide information qualitatively by “hearing” the sounds through the operator’s headphones. They also can measure the sound quantitatively, via incremental readings on a meter, visually displaying sonic patterns that can be data-logged. By noting sound intensity levels (usually as dB), users can obtain estimated CFM valves to help calculate leak cost.
Airborne ultrasound translators are relatively simple to use. The interchangeable modules allow users to adjust for different types of inspection problems. For example the scanning mode can be used for airborne ultrasound detection while the contact mode (or stethescope mode) can be used for structure borne leaks underground.
With the use of more advanced probes, decibel readings generated by all equipment and machinery plant-wide can be downloaded, stored in most spreadsheet platforms (i.e., Excel and Access) and retrieved for graphical comparison with baseline data for permanent and ongoing maintenance records.
Other Applications for Ultrasonic Testing:
There are several applications where ultrasonic testing can be vital
to the success of a predictive maintenance program. Please click
here to review typical applications that utilize ultrasound technology.
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