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in subjects: "Laser Acoustics"

open access

Visualization of Acoustic Waves Propagating within a Single Anisotropic Crystalline Plate

High frequency acoustic waves propagating within a thin anisotropic plate were imaged using a hybrid system consisting of an acoustic lens (Frequency: 200MHz; Point Focus) for point excitation on one side and a laser displacement interferometer for point detection on the opposite side. The laser beam spot was about 5µm diameter on the surface and the sample was scanned to provide an image of the lateral spatial distribution of the resultant displacement. Theoretical prediction of the resultant … more

Date: April 1, 2007

Creator: Miyasaka, Chiaki; Telschow, Kenneth L.; Sadler, Jeffry T. & Maev, Roman. Gr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Real-Time Measurement of Material Elastic Properties in a High Gamma Irradiation Environment

This paper describes the first noncontact elastic vibration measurements of an object in a high gamma radiation field. Using a laser-coupled resonant ultrasound technique, the vibration modes of an Inconel hollow capped cylinder were measured as the gamma radiation field was increased to 104 Gy/h. This measurement technique allowed shifts in the resonant frequency of the sample’s vibration modes to be tracked over a 170-h period. The vibration mode frequencies changed in a manner consistent wit… more

Date: May 1, 2006

Creator: Telschow, Ken; Schley, Rob & Cottle, Dave