Abstract
Every material has its own surface configuration and the surface gets modified when it is treated using some surfactants. The action of surfactants on the material creates a number of elastic skeletal structures which enable the material to be used as acoustic material for absorption of sound. The sensitivity of the material to high intensity of sound has great importance in different technological applications. A laboratory designed noncontact laser based sensor has shown its credential by sensing the surface roughness, which is an essential and sufficient condition for measurement of the sound absorption coefficient. The sensitivity is measured from speckle contrast which provides the suitability of the material for sensing sound intensity. The estimation of surface roughness and the presence of porosity are well recognized by the speckle contrast which helps measure the efficiency of the sound absorption coefficient. The incident of a laser beam in the presence of sound intensity significantly enhances the sound absorption followed by the loss of kinetic energy due to high amplitude vibrations within the pores present on the surface of the material medium exposed under the high intensity of laser light.
Published Version
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