A gentle nodal suspension for measurements of the acoustic attenuation in materials
A gentle nodal suspension for measurements of the acoustic attenuation in materials
复制标题
用于测量材料声衰减的温和节点悬架
DOI：
10.1063/1.3124800
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
F. Piergiovanni
中科院分区：
文献类型：
--
作者：
E. Cesarini;M. Lorenzini;G. Cagnoli;F. Piergiovanni
超低机械损耗材料的损耗角测量通常会受到较大系统误差的影响，这是由于用于固定样品的悬挂系统引入的额外损耗造成的。低损耗材料对于用于引力波观测的地基干涉检测器具有很大的意义。蓝宝石和硅等晶体或熔融石英等非晶材料的固有损耗角在 10-10 ÷ 10-6 范围内；由于可实现的热噪声水平非常低，这些材料在检测小位移方面非常受关注。提出了一种材料声衰减的创新测量系统。 GeNS（温和节点悬浮）是将盘状样品平衡地悬浮在球体顶部，接触振动节点之一，已在佛罗伦萨的 INFN Virgo 实验室开发出来，然后在里昂的 Laboratoire des Materiaux Avances 实验室升级到低温阶段。与迄今为止使用的其他系统相比，该系统的优点是双重的：首先，仅接触样品的一个表面，并且由于不存在施加力，所以接触表面最小化；其次，可以测量并最终改变悬浮液的一些相关参数，使实验人员能够确定测量的损失是否受到使用中的悬浮液系统的限制，或者是所研究样品的固有特性。将展示室温下的最新技术和关键结果。
Loss angle measurements in ultralow mechanical loss materials are normally affected by a large systematic error due to the excess losses introduced by the suspension system used to hold the samples. Low loss materials are of great interest for ground-based interferometric detcors for gravitational wave observations. Crystals such as sapphire and silicon or amorphous materials such as fused silica can have intrinsic loss angles in the range of 10-10 ÷ 10-6; these materials are of extreme interest in the detection of small displacements, due to a very low achievable level of thermal noise. An innovative measurement system of the acoustic attenuation in materials is proposed. GeNS (Gentle Nodal Suspension), where a disk-shaped sample is suspended in equilibrium on the top of a sphere, touching in one of the nodal points of vibration, has been developed in INFN Virgo laboratory in Florence and then upgraded to a cryogenic stage in the Laboratoire des Materiaux Avances in Lyon. The advantage of this system, as compared to others used so far, is twofold: first, one surface only of the sample is touched and the contact surface is minimized because of the absence of applied forces; secondly, some relevant parameters of the suspension can be measured and eventually varied, giving the experimentalist the possibility to identify whether the measured loss is limited by the suspension system in use or it is an intrinsic property of the sample under investigation. State of the art and crucial results at room temperature will be presented.
TiO2 掺杂单层 Ta2O5 低温机械耗散峰的测量
影响因子：
3.5
作者：
I. Martin;H. Armandula;C. Comtet;M. M. Fejer;A. Gretarsson;G. Harry;J. Hough;J. M. M. Mackowski;I. MacLaren;C. Michel;J. L. Montorio;N. Morgado;R. Nawrodt;S. Penn;S. Reid;A. Remillieux;R. Route;S. Rowan;C. Schwarz;P. Seidel;W. Vodel
通讯作者：
W. Vodel