High-Sensitivity Accelerometry with a Feedback-Cooled Magnetically Levitated Microsphere
High-Sensitivity Accelerometry with a Feedback-Cooled Magnetically Levitated Microsphere
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DOI：
10.1103/physrevapplied.15.014050
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发表时间：
2021-01-27
影响因子：
4.6
通讯作者：
D'Urso, Brian
中科院分区：
文献类型：
--
作者：
Lewandowski, Charles W.;Knowles, Tyler D.;D'Urso, Brian
我们表明，磁悬浮微球在高真空中可以用作加速度计，通过比较其响应的市售的地震检波器。该系统显示出巨大的前景，无需大的质量或低温的加速度灵敏度。通过反馈冷却，瞬态衰减时间缩短，质心运动被冷却到9 K或更低。值得注意的是，悬浮粒子加速度计的灵敏度低至3.6 x 10（-8）g/root Hz，在高达14 Hz的频率下给出的测量结果与商用地震检波器相似，尽管测试质量小了40亿倍。在校准中没有自由参数的情况下，加速度计的响应在5 Hz下匹配在3%以内。该系统达到这种灵敏度，由于一个相对较大的颗粒质量为0.25 μ g，低中心的质量振荡频率为1.75 Hz，和图像分析方法，可以测量的位移与一个单一的图像中的不确定性为1.6 nm。
We show that a magnetically levitated microsphere in high vacuum can be used as an accelerometer by comparing its response to that of a commercially available geophone. This system shows great promise for ultrahigh acceleration sensitivities without the need for large masses or cryogenics. With feedback cooling, the transient decay time is reduced and the center-of-mass motion is cooled to 9 K or less. Remarkably, the levitated-particle accelerometer has a sensitivity down to 3.6 x 10(-8) g/root Hz and gives measurements similar to those of the commercial geophone at frequencies up to 14 Hz despite a test mass that is four billion times smaller. With no free parameters in the calibration, the responses of the accelerometers match within 3% at 5 Hz. The system reaches this sensitivity due to a relatively large particle mass of 0.25 mu g, a low center-of-mass oscillation frequency of 1.75 Hz, and an image-analysis method that can measure the displacement with an uncertainty of 1.6 nm in a single image.