ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY
Ultrasound test. Technician using ultrasound to examine a large gear wheel as part of quality control. The device in the technician's hand sends ultrasonic vibrations into the wheel and picks up the signal's reflections which it then displays on the monitor at upper left. Faults, such as cracks, will strongly reflect the ultrasound waves. Ultrasound is a high-frequency sound. It has a frequency of 18-20 thousand cycles per second (kilohertz) and is inaudible to the human ear. It provides a cheap, safe way of examining the insides of components. Photograph of a gear wheel for rolling mill equipment being tested.
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