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Microcracks inside metallic materials seriously influence the mechanic properties of materials and can endanger machine operations. The nonlinear acoustic features, such as harmonics will appear with ultrasound through a damaged material. Based on the relationship between the harmonics, a method using nonlinear acoustic harmonic amplitude ratio to distinguish microcracks in metallic materials is discussed...
This paper describes the Microelectromechanical Systems (MEMS) optical fiber pressure sensor signal interrogation systems. The white-light interferometry system, component test system (CTS) and self-calibrated interferometric intensity based (SCIIB) system are introduced. The signal of the optical fiber pressure sensor processing schemes is presented. With the system the cavity of the MEMS optical...
This paper present a wavelet-fractal dimension approach for extracting feature from ultrasonic non-destructive evaluation (NDE) data of a test multilayer adhesive structure specimen. These features are then used to estimate the specimen's bonded quality. When the multilayer adhesive structure undergo ultrasonic NDE, echo from interior layers often overlap severely, causing information from individual...
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