Ultrasonic Bragg imaging of flaws

Cepstrum - based Deconvolution Techniques for Ultrasonic Pulse - echo Imaging of Flaws in Composite Laminates

Ultrasonic imaging is a powerful nondestructive evaluation (NDE) tool for flaw characterization. This thesis discusses the signal processing techniques developed for ultrasonic imaging of flaws in composite laminates. Commonly used time-domain signal processing techniques have problems including poor resolution, dependence on operator's experiences and subjectivity. Some transform-domain proces...

Detection and Visualization of Flaws in Ultrasonic Defectoscopy

In ultrasonic defectoscopy it is very difficult to detect flaws in materials with coarse-grain structure. Measured ultrasonic signal contains echoes from flaw and echoes from grains included in material. These echoes characterized noise have to be cancelled. A common source of noise is electronic circuitry, which is used for processing of the ultrasonic signal, and scattering at the inhomogenei...

Analysis of Fiber Bragg Gratings For Ultrasonic Detection

Ultrasonic Imaging

The basic principles of ultrasonic B-mode imaging aresummarized. Tissue features that generate contrast andsystem features that control image quality are reviewed inthe context of breast cancer imaging. Approaches to signalmodeling, including B-mode and Doppler techniques, arereviewed to guide methodological design and clinical eval-uation. The article concludes with a b...

Response of a fiber Bragg grating ultrasonic sensor

Pavel Fomitchov Sridhar Krishnaswamy, MEMBER SPIE Northwestern University Center for Quality Engineering and Failure Prevention 2137 North Sheridan Road Evanston, Illinois 60208 E-mail: [email protected] Abstract. A fiber Bragg grating (FBG) sensor for detection of ultrasonic waves in liquids and solid structures is investigated. The sensor contains a fiber probe with a FBG, a tunable narr...