Traceability of the Hannover FG5X-220 to the SI Units
Traceability of the Hannover FG5X-220 to the SI Units
复制标题
Hannover FG5X-220 可追溯至 SI 单位
DOI：
10.1007/1345_2016_226
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Timmen
中科院分区：
文献类型：
--
作者：
Schilling;Timmen
目前的绝对测量是通过激光干涉测量自由下落的后向反射器来实现的。Micro-g LaCoste FG 5X是一款自由落体重力仪，配备马赫-曾德配置的激光干涉仪，使用同时的时间和距离测量来计算g的绝对值。由于仪器本身包含用于精确时间和长度测量的必要工作标准，因此被认为独立于外部参考。定时由10 MHz的铷振荡器保持，稳定度为。长度单位由激光干涉仪实现。经过频率校准和碘稳定的氦氖激光器波长为633 nm，精度为。2012年，Erdmessung研究所（IfE）的FG 5 -220升级为FG 5X-220。升级包括一个新的滴注室，自由落体时间更长，新的电子设备包括一个新的铷振荡器。国际单位制（SI单位）测量单位的可追溯性通过两种互补和连续的方法来确保：将频率与高阶标准进行比较，以及将测量值与绝对重力仪测量的参考值进行比较，绝对重力仪被定义为SI内的基本标准。进行了一些实验来测试铷振荡器。振荡器在使用的头18个月里每月的线性漂移为。最近，绝对重力仪的频率发生了0.01 Hz（=）的跳变，漂移率变为/month.Since绝对重力仪的升级，该仪器参加了几次国际比对，结果表明仪器升级前后没有明显的测量偏差。
The absolute measurement ofgis currently realized through the laser interferometric measurement of a free falling retro-reflector. The Micro-g LaCoste FG5X is a free-fall gravimeter with a laser interferometer in Mach-Zehnder configuration which uses simultaneous time and distance measurements to calculate the absolute value ofg. Because the instrument itself contains the necessary working standards for precise time and length measurements, it is considered independent of external references. The timing is kept with a 10 MHz rubidium oscillator with a stability of. The length unit is realized by the laser interferometer. The frequency calibrated and iodine stabilized helium-neon laser has a wavelength of 633 nm and an accuracy of.In 2012 the FG5-220 of the Institut für Erdmessung (IfE) was upgraded to the FG5X-220. The upgrade included a new dropping chamber with a longer free fall and new electronics including a new rubidium oscillator. The metrological traceability to measurement units of the Système International d’unités (SI unit) is ensured by two complementary and successive approaches: the comparison of frequencies with standards of higher order and the comparison of the measuredgto a reference measured by absolute gravimeters defined as primary standards within the SI. A number of experiments to test the rubidium oscillator were performed. The oscillator showed a linear drift ofper month (=per month) in the first 18 months of use. A jump in the frequency of 0.01 Hz (=) was revealed recently and the drift rate changed to/month.Since the upgrade of the absolute gravimeter the instrument participated in several international comparisons, which showed no significant measuring offset between the instrument prior and after the upgrade.
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影响因子：
--
作者：
L. Vitushkin
通讯作者：
L. Vitushkin
绝对弹道重力仪
影响因子：
--
作者：
L. Vitushkin
通讯作者：
L. Vitushkin
2007 年 11 月在 Walferdange（卢森堡）进行的欧洲绝对重力仪比较结果
影响因子：
2.4
作者：
O. Francis;T. Dam;A. Germak;M. Amalvict;R. Bayer;M. Bilker‐Koivula;M. Calvo;G. D’Agostino;T. Dellacqua;A. Engfeldt;R. Faccia;R. Falk;O. Gitlein;M. Fernandez;J. Gjevestad;J. Hinderer;D. Jones;J. Kostelecký;N. Moigne;B. Luck;J. Mäkinen;D. Mclaughlin;T. Olszak;P. Olsson;A. Pachuta;V. Pálinkás̆;B. Pettersen;R. Pujol;I. Prutkin;D. Quagliotti;R. Reudink;C. Rothleitner;D. Ruess;C. Shen;V. Smith;S. Svitlov;L. Timmen;C. Ulrich;M. Camp;J. Walo;Lei Wang;H. Wilmes;L. Xing
通讯作者：
L. Xing
影响因子：
2
作者：
L. Timmen;O. Gitlein;V. Klemann;D. Wolf
通讯作者：
L. Timmen;O. Gitlein;V. Klemann;D. Wolf
影响因子：
4.4
作者：
Creutzfeldt, Benjamin;Ferre, Ty;Guentner, Andreas
通讯作者：
Guentner, Andreas