Didem Ozevin

TL;DR: In this paper, a leak localization approach is proposed for pipeline networks spread in a two dimensional configuration, and the approach is to determine arrival time differences using cross correlation function, and introduce the geometric connectivity in order to identify the path that the leak waves should propagate to reach the AE sensors.

TL;DR: In this paper, the authors describe resonant capacitive MEMS transducers developed for use as acoustic emission detectors, fabricated in the commercial three-layer polysilicon surface micromachining process (MUMPs).

TL;DR: In this article, two wavelet-based algorithms are introduced to analyze the waveform in nonlinear ultrasonic testing and the results showed that the acoustic nonlinearity parameter calculated through the proposed algorithms is not influenced by signal processing variables, and the signal processing error is reduced when the waveletbased decomposition is applied.

TL;DR: In this paper, two different frequency sensors are designed and characterized for detecting elastic waves released by active flaws, known as acoustic emission (AE), which operate in plate flexural mode or rigid body mode driven by the vibration of silicon diaphragm where piezoelectric layer is deposited on.

TL;DR: In this article, a conformal gradient-index phononic crystal lens integrated within a pipe to amplify guided wave modes was proposed for improved ultrasonic inspection of pipelines, which is composed of an array of cylindrical steel stubs attached to the outer surface of a steel pipe, which are tailored according to the hyperbolic profile of refractive index in the circumferential direction of the pipe.