Novel Method to Measure the Gravitational Constant

测量引力常数的新方法

• 批准号: 21K03603
• 负责人: Zeidler Simon
• 金额: $ 2.66万
• 依托单位: Rikkyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K03603/
• 关键词: polarization stability; noise; coherence; Interferometer; Mach-Zehnder; Laser; Gravity

I succeeded to build a laser Doppler-interferometer, connected to a high-speed sampling oscilloscope, with which oscillation-amplitudes at 1~5kHz below picometer-ranges (<10^-12 m) could be measured. The first attempt of building such an instrument lagged clearly in polarization stability as the measured ground noise could not be lowered below 1pm/Hz^(1/2) even with a maximum sampling rate of 5MHz. The last measured ground noise is now at 0.13pm/Hz^(1/2).The instrument has experienced upgrades regarding the polarization stability in the form of Glan-Taylor prisms which are now in front of the waveplates on the recombining beam-splitter side and a Faraday isolator at the laser-input. Furthermore, care has been taken to ensure an equal optical path length for both the reference and the signal beam path by using polarization maintaining fibers. This increased the coherence of both beams and thus also the contrast of the observed fringes at the detectors.One minor aspect of the conducted research was to ensure the usability of the Piezo-test chip even for oszillation amplitudes below a picometer. This is important to keep the dynamic constrast low and thus the resolution of the measurements high. The results clearly proof the capability of the test-chip.

我成功地构建了一个激光多普勒式互操作仪，连接到高速采样示波器，在该示波器下，可以测量振荡示波器，在该示波器下，可以测量振荡示波器（<10^-12 m）以下1〜5kHz（<10^-12 m）。即使最大的采样率为5MHz，也无法降低以下1 pm/hz^（1/2），这是在极化稳定性中明显滞后的第一次尝试。现在测量的地面噪声在0.13pm/hz^（1/2）中。该仪器以Glan-Taylor Prisms的形式进行了升级，这些升降机稳定性现在位于重组光束 - 剪贴器侧的波动板前，在激光输入的Faraday隔离器上。此外，通过使用极化维持纤维来确保参考和信号梁路径的相等光路径长度。这增加了两种梁的相干性，因此也提高了检测器上观察到的条纹的对比。进行的研究的一个次要方面是确保压电测试芯片的可用性，即使是在生平下方下方的渗透幅度也是如此。这对于保持动态约束较低，从而使测量值较高的分辨率很重要。结果清楚地证明了测试片的能力。

项目成果

Sub-nm Amplitude Detector Construction for Newton-V Microgravity Measurement

用于牛顿 V 微重力测量的亚纳米振幅探测器结构

• 发表时间: 2022
• 作者: Simon Zeidler

Novel Method to Measure Gravity at small Distances

短距离测量重力的新方法

• 发表时间: 2021
• 作者: Simon Zeidler;渡邉丈晃;Simon Zeidler;Daisuke Ikeda;Simon Zeidler
• 通讯作者: Simon Zeidler

The Search for Deviations from Newton’s Gravity at Micrometer Scales

寻找微米尺度上牛顿引力的偏差

• 发表时间: 2022
• 作者: Simon Zeidler;渡邉丈晃;Simon Zeidler
• 通讯作者: Simon Zeidler