Kažys Rymantas Jonas, Tumšys Olgirdas
Ultrasound Research Institute, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania.
Sensors (Basel). 2021 Oct 13;21(20):6779. doi: 10.3390/s21206779.
Ultrasonic guided waves are already used for material characterization. The advantage of these waves is that they propagate in the plane of a plate and their propagation characteristics are sensitive to properties of the material. The objective of this research was to develop an ultrasonic method that could be used to measure the properties of thin plastic polyvinylchloride films (PVC). The proposed method exploits two fundamental Lamb wave modes, A and S, for measurement of a thin film thickness and Young's modulus. The Young's modulus is found from the measured phased velocity of the S mode and the film thickness from the velocities of both A and S modes. By using the proposed semi-contactless measurement algorithm, the Young's modulus and thickness of different thickness (150 µm and 200 µm) PVC films were measured. The uncertainty of thickness measurements of the thinner 150 µm PVC film is 2% and the thicker 200 µm PVC film is 3.9%.
超声导波已用于材料表征。这些波的优点是它们在板材平面内传播，并且其传播特性对材料的性质敏感。本研究的目的是开发一种可用于测量薄聚氯乙烯（PVC）塑料薄膜性能的超声方法。所提出的方法利用两种基本的兰姆波模式，即A模式和S模式，来测量薄膜厚度和杨氏模量。杨氏模量由测量得到的S模式相速度得出，薄膜厚度由A模式和S模式的速度得出。通过使用所提出的半非接触式测量算法，测量了不同厚度（150微米和200微米）的PVC薄膜的杨氏模量和厚度。较薄的150微米PVC薄膜厚度测量的不确定度为2%，较厚的200微米PVC薄膜为3.9%。
