MEASUREMENT OF SURFACE WAVES FROM SUBSURFACE GAGE

Altitude measurement using laser beam reflected from water surface

In this paper altitude measurement from water surface using laser beam is presented. Research data indicate that the reflection of infrared waves from water surface is about zero and it is less than 2% for visible radiations. Phase-shift and heterodyne technique was used for the measurement, and the laser beam ( mW p nm 10 , 700 = = l ) was modulated by a sine wave having a fixed frequency....

Local Study of Thin-Film Adhesion by Surface Acoustic Waves and Subsurface Acoustic Microscopy Imaging

Four thin-film adhesion characterization methods are proposed. Two of them are surface acoustic wave based and the two others emphasize the complementary nature between acoustic microscopy, scratch test and tensile experiments. A continuous wave scanning acoustic microscope was used to propagate surface modes in the specimen and to measure the surface acoustic wave velocity as a function of the...

Dynamic Rotary Torque Measurement Using Surface Acoustic Waves

This paper identifies a new, potentially low cost, non-contact, frequency domain strain torque sensor utilising SAW (Surface Acoustic Wave) Technology for surface strain measurement. The sensor has a short axial length making it flexible in terms of integration into a variety of applications, encompassing both static and dynamic measurement. The paper presents a technical description of the res...

Subsurface Waves in Solids with Curved Surface and Acoustical Impedance on It

This paper presents the results of a study of the peculiarities of subsurface longitudinal (head) waves (SLW) and transverse waves (STW) propagation in solids with wavequide surface of different geometry. Studying an acoustical path of SLW propagation along axis of metallic cylindrical solid of radius R we established, that dependence of pulse amplitude vs. distance r can be approximated by fun...

Invasive Surface and Subsurface Data