Institut d'Electronique du Sud, IES, UMR CNRS 5214, Université Montpellier II, CC 082, Place Eugène Bataillon, 34095 Montpellier, Cedex 5, France.
Ultrasonics. 2010 Jun;50(7):710-5. doi: 10.1016/j.ultras.2010.02.007. Epub 2010 Feb 17.
In this work, we propose a study dedicated to the influence of the delay line nature in transverse ultrasonic sensors, dedicated to dynamic high frequency elastic moduli of viscoelastic materials estimation. In literature, these shear ultrasonic rheometers are using delay lines in glass or quartz and normal or oblique incidence of ultrasonic rays. The oblique incidence is used in order to improve the sensitivity of the measurements. We theoretically demonstrate in this work that the use of delay lines in polymers is recommended to improve the sensitivity. Due to modifications, performed on a 10 MHz commercial ultrasonic sensor, we experimentally show on glycerin (which is a Newtonian material) that it is possible to multiply by a factor 10 the sensitivity; compared to delay lines in quartz using a normal incidence of rays. Hence, we overpass the accuracy of the oblique incidence approach with a simpler experimental setup.
在这项工作中，我们提出了一项研究，专门研究延迟线性质对横向超声传感器的影响，该传感器用于动态高频粘弹性材料弹性模量的估计。在文献中，这些剪切超声流变仪使用玻璃或石英中的延迟线以及超声波射线的法向或斜入射。斜入射用于提高测量的灵敏度。在这项工作中，我们从理论上证明了在聚合物中使用延迟线可以提高灵敏度。由于对 10MHz 商用超声传感器进行了修改，我们在甘油（牛顿材料）上进行了实验，结果表明，与使用射线法向入射的石英中的延迟线相比，灵敏度可以提高 10 倍。因此，我们通过更简单的实验设置，超越了斜入射方法的精度。
