Ultrasonic diagnosis that is convenient and nondestructive to the human body is widely used in medicine. In clinical, ultrasonic backscattered signals characteristics are utilized to acquire information of the human body tissues to perform diagnosis. In this paper, an adaptive ultrasonic backscattered signal processing technique for instantaneous characteristic frequency detection based on the ...

DEVELOP SONIC INFRARED IMAGING NDE FOR LOCAL DAMAGE ASSESSMENTIN CIVIL STRUCTURESbyQi HeDecember 2010Advisor: Dr. Xiaoyan HanMajor: Electrical EngineeringDegree: Doctor of PhilosophyNondestructive Evaluation (NDE) is an interdisciplinary field of study, which isconcerned with the development of analysis techniques and measurement technologiesfor the q...

Laser-based ultrasonic techniques have been investigated for the nondestructive testing of advanced aeronautic composite structures for more than twenty years. Several organizations have evaluated the technology at various levels during this period. In one case, EADS (formerly Aerospatiale) acquired, jointly with Dassault Aviation, a laser ultrasonic system from a now defunct provider. In anoth...

Ultrasonic methods are widely applied for nondestructive evaluation of structural components during both the manufacturing process and subsequent field inspections. The field inspections often require expensive teardown in order to access the back surfaces of critical components. Active ultrasonic methods are also a subject of ongoing research for structural health monitoring whereby transducer...

Ultrasonic imaging has been an essential tool for nondestructive evaluation of materials and flaw detection. However, flaw detection in the presence of microstructure scattering noise is a challenging problem. This chapter presents frequency-diverse ultrasonic detection algorithms which are essential to decorrelate the microstructure scattering noise and to enhance the visibility of echoes asso...

Diffuse ultrasonic backscatter measurements have been especially useful for extracting microstructural information and for detecting flaws in materials. Accurate interpretation of experimental data requires robust scattering models. Quantitative ultrasonic scattering models include components of transducer beam patterns as well as microstructural scattering information. Here, the Wigner distrib...

This paper addresses high-resolution ultrasonic image reconstruction from Full Matrix Capture (FMC) data in the context of nondestructive testing (NDT). In order to reduce numerical complexity, time-domain and model are projected into domain through a linear beamforming procedure. The resulting is interpreted as shift-variant convolution process, affected by non-stationary colored noise. An int...

Two ultrasonic nondestructive evaluation methods have been applied to systematically characterize the mechanical properties of nanostructured physical vapor deposited diamond-like carbon (DLC) ultra-hard coatings. A photoacoustic guided-wave technique is used to generate broadband surface acoustic waves (SAW) on the coating surfaces, and dispersion relations of the SAW for DLC coatings are meas...

This paper proposes a non-contact nondestructive evaluation (NDE) technique that uses laser-induced ultrasonic waves to visualize corrosion damage in aluminum alloy plate structures. The non-contact, pulsed-laser ultrasonic measurement system generates ultrasonic waves using a galvanometer-based Q-switched Nd:YAG laser and measures the ultrasonic waves using a piezoelectric (PZT) sensor. During...