High quality factor measured in fused silica
High quality factor measured in fused silica
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在熔融石英中测量的高品质因数
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Swords
中科院分区：
文献类型：
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作者：
S. Penn;G. Harry;A. Gretarsson;S. Kittelberger;P. Saulson;J. Schiller;Joshua R. Smith;S. Swords
我们测量了拉成棒的熔融石英样品的机械耗散。样品悬挂在多摆锤悬架上，使其免受支撑物的摩擦、支撑结构的反冲以及地震噪声的影响。对多种模式的品质因数 Q 进行了测量，在 726 Hz 下，模式 2 的品质因数 Q 值高达 57.1±10 万。该结果比之前的室温测量结果高出约 2 倍。测得的 Q 值在很大程度上取决于处理情况，原始火焰抛光表面的 Q 值比在铜管上敲击数次的表面高出三到四倍。
We have measured the mechanical dissipation in a sample of fused silica drawn into a rod. The sample was hung from a multiple-bob suspension, which isolated it from rubbing against its support, from recoil in the support structure, and from seismic noise. The quality factor, Q, was measured for several modes with a high value of 57.1±0.1 million found for the mode number 2 at 726 Hz. This result is about a factor of 2 higher than previous room temperature measurements. The measured Q was strongly dependent on handling, with a pristine flame-polished surface yielding a Q three to four times higher than a surface which had been knocked several times against a copper tube.