An ultrasonic method for determination of elastic moduli, density, attenuation and thickness of a polymer coating on a stiff plate

Analytical investigation of the variations of nano-film densities with thickness

“…It can clearly be seen that good agreements were obtained. Such good agreements were also noticed for other structures Al 2 O 3 /Si [11] and polypropylene (PP)/ss [12] whose data are regrouped in Table 2. [10] VN/MgO [10] Al 2 O 3 /Si [11] PP/Steel [12] h(µm) …”

Noncontact method applied to determine thickness of thin layer based on laser ultrasonic technique

“…8 Nevertheless, an optically reflective surface is required for efficient detection, which is a major drawback for on-line monitoring and detection on rough surfaces. Alternatively, combining traditional PZT with special signal processing technique, such as spectrum analysis, 9 wavelet analysis 10 and inverse algorithm, 11 can be also deal with the problem in a relatively low frequency range (,15 MHz). However, the application of PZT is severely limited by the physical coupling between sensors and material surface, which reduces testing efficiency.…”

A numerical model for ultrasonic measurements of swelling and mechanical properties of a swollen PVA hydrogel

“…Ultrasonic methods have been used for the mechanical characterization of hydrogels by several researchers [6][7][8][9]. The physics of the sorption process of PVA hydrogels was extensively discussed in the paper reported by Luprano et al A method proposed for determining glass-rubber phase transformation in PVA hydrogels using Scanning Laser Acoustic Microscopy (SLAM).…”

“…However, the diffraction and misalignment effects were not taken into account in their model. Lavrentyev and Rokhlin [8] developed an ultrasonic method for the calculations of the properties of polymer-coated materials widely used in manufacturing industries. The properties (i.e.…”