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中国计量科学研究院 时间频率计量科学所,北京 100029
[ "李春剑(1983-),女,河北保定人,硕士,副研究员,2009年于中国计量科学研究院获得硕士学位,主要从事绝对重力精密测量的研究。E-mail:lichj@nim.ac.cn" ]
[ "吴书清(1979-),男,安徽合肥人,博士研究生,副研究员,2012年于中国计量科学研究院获得硕士学位,主要从事绝对重力精密测量的研究。E-mail:wushq@nim.ac.cn" ]
收稿日期:2020-11-03,
修回日期:2021-01-05,
纸质出版日期:2021-07-15
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李春剑,吴书清,粟多武等.光干涉绝对重力仪测量A类不确定度优化[J].光学精密工程,2021,29(07):1527-1538.
LI Chun-jian,WU Shu-qing,SU Duo-wu,et al.Improvement method for type A uncertainty of interferometric gravimeter[J].Optics and Precision Engineering,2021,29(07):1527-1538.
李春剑,吴书清,粟多武等.光干涉绝对重力仪测量A类不确定度优化[J].光学精密工程,2021,29(07):1527-1538. DOI: 10.37188/OPE.2020.0566.
LI Chun-jian,WU Shu-qing,SU Duo-wu,et al.Improvement method for type A uncertainty of interferometric gravimeter[J].Optics and Precision Engineering,2021,29(07):1527-1538. DOI: 10.37188/OPE.2020.0566.
光干涉绝对重力仪采用迈克尔逊干涉仪监测被测落体的下落位移。干涉仪的参考棱镜需相对于地球中心静止,然而置于地面上的参考棱镜会随着地面振动,这将使干涉法所测的落体相对于地球的位移变化有偏差,直接影响重力仪单次测量数据的准确性,同时增大了多次测量数据的分散性。因此,针对NIM-3A型绝对重力仪提出了全新的测振补偿法,利用高精度测振传感器监测地面振动,并将它补偿到干涉法监测的被测落体下落位移上。实验结果表明:测量结果的A类不确定度优化了7.8倍,且未出现系统偏差。该方法在未出现系统偏差的情况下,有效提高了单次测量数据的准确性,减小了多次测量数据的分散性,优化了测量结果的A类不确定度。
An interferometric gravimeter monitors the trajectory of a free-falling object using a Michelson laser interferometer. The reference mirror of the interferometer, relative to the center of the earth, must be static. However, its vibration, according to ground vibrations, is inevitable and causes a deviation between the dropper displacement relative to the center of the earth and that monitored via optical interferometry. This directly impacts the measurement accuracy for a single drop and many scattered drops. Therefore, a vibration compensation method, which compensates the dropper displacement measured via optical interferometry according to ground vibrations monitored by a high-precision ultra-low frequency vibration sensor, is proposed herein for a NIM-3A absolute gravimeter. Experimental results indicate that type A uncertainty of NIM-3A was 7.8 times optimized, without system deviations. The proposed method effectively improves the measurement accuracy for a single drop and many scattered drops and type A uncertainty of NIM-3A without system deviations.
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