Fast alignment of beam verticality for absolute gravimeters

Qi-yu WANG; Jin-yang FENG; Chun-jian LI; Duo-wu SU; Shu-qing WU

doi:10.3788/OPE.20192701.0001

您当前的位置：

首页 >

文章列表页 >

Fast alignment of beam verticality for absolute gravimeters

Modern Applied Optics | 更新时间：2020-08-13

- Fast alignment of beam verticality for absolute gravimeters
- Optics and Precision Engineering Vol. 27, Issue 1, Pages: 1-7(2019)
- 作者机构：
  
  中国计量科学研究院，北京 100029
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192701.0001
  CLC： TP762; TH744
- Received：25 June 2018，
  
  Accepted：29 August 2018，
  
  Published：15 January 2019
- 稿件说明：
移动端阅览
Qi-yu WANG, Jin-yang FENG, Chun-jian LI, et al. Fast alignment of beam verticality for absolute gravimeters[J]. Optics and precision engineering, 2019, 27(1): 1-7.
DOI：

Qi-yu WANG, Jin-yang FENG, Chun-jian LI, et al. Fast alignment of beam verticality for absolute gravimeters[J]. Optics and precision engineering, 2019, 27(1): 1-7. DOI： 10.3788/OPE.20192701.0001.

摘要

为了减小自由落体式光学干涉型绝对重力仪中光束垂直度对重力测量准确度的影响，提出了一种基于双层液体光楔对光束的可变偏折实现光束垂直性自校正的快速调节方法。当光束偏离铅锤方向时，利用液面天然水平的特性，使液体在重力的作用下形成可变液体光楔，自上而下的光束经双层液体光楔时光束传播方向发生偏转，合理地匹配双层液体的折射率，使它偏离铅锤方向的夹角得到实时修正。搭建光束垂直性自校正装置并进行实验验证，结果表明，装置的角度抑制比优于18.0，当装置倾斜角度不大于2.7′时，出射光束偏离铅锤方向不超过9.0″，对应于重力加速度的测量误差小于1 μGal (1 μGal=10

-8

m/s

)。将本方案用于自由落体式的重力加速度测量，仅通过条式水平仪调平便可实现光束垂直性的快速准确调节，同时还能抑制测量过程中光束垂直性缓变带来的影响。

Abstract

To reduce the influence of beam verticality on the accuracy of gravity measurement for free-fall absolute gravimeters based on optical interferometry

a fast alignment method based on the adjustable deflection of the laser beam by two liquid-filled optical wedges to realize the self-correction of beam verticality was proposed. When the direction of the laser beam deviates from the plumb line

the liquid forms variable optical wedges under the force of gravity due to the nature of the liquid level. The laser beam is deflected when it passes through a double layer liquid-filled optical wedge from top to bottom. The deviation angle of the laser beam from the plumb line is corrected in real time by adjusting the refractive index of the liquid appropriately. A self-correcting device for beam verticality was built and verified experimentally. The results indicate that the angle rejection ratio of the device is better than 18.0. When the tilt angle of the device does not exceed 2.7′

the deviation of the output beam from the plumb line does not exceed 9.0″

corresponding to an error of g measurement less than 1 μGal (1 μGal = 10

-8

m/s

). Assuming that this solution is used for free-fall gravitational acceleration measurement

it is expected that the beam verticality can be aligned quickly and accurately only by leveling with a tubular spirit level. Furthermore

it can also inhibit the influence of the gradual change in beam verticality during the measurement.

关键词

Keywords

references

TAN Y J, SHAO C G, LI J, et al .. A general relativistic model for free-fall absolute gravimeters[J]. Metrologia , 2016, 53(2): 846-852.

江颖, 李辉, 刘子维, 等.利用连续重力观测约束2014智利Iquique地震的震源机制解[J].地球物理学报, 2016, 59(3): 941-951.

JIANG Y, LI H, LIU Z W, et al .. Constraining the focal mechanism of the Iquique earthquake with observations of the continuous gravity stations[J] . Chinese J. Geophys , 2016, 59(3): 941-951. (in Chinese)

MUSSO C, BRESSON A, BIDEL Y, et al .. Absolute gravimeter for terrain-aided navigation[C]. Proceedings of the 20th International Conference on Information Fusion (Fusion), Xi'an, P.R. China , 2017: 1-7.

HEES A, BAILEY Q, BOURGOIN A, et al .. Tests of Lorentz symmetry in the gravitational sector[J]. Universe , 2016, 2(4): 30-70.

SCHWARZ J P, ROBERTSON D S, NIEBAUER T M, et al .. A new determination of the Newtonian constant of gravity using the free fall method[J]. Measurement Science and Technology , 1999, 10(6): 478-486.

WU S, ZHANG Z, LI C, et al .. Preliminary result of accurate gravimetry at NIM Joule balance site[C]. Proceedings of Conference on Precision Electromagnetic Measurements (CPEM 2016), Ottawa, ON, Canada, 2016: 75406841-2.

姜永涛, 王丽美, 郭广猛, 等.川滇地区震间期断层运动引起的重力变化[J].地球物理学进展, 2018, 33(1): 25-29.

JIANG Y T, WANG L M, GUO G M, et al .. Research on the inter-seismic gravity change due to the fault movements in Sichuan-Yunnan region[J]. Progress in Geophysics , 2018, 33(1):25-29. (in Chinese)

CHEN S, LIU M, XING L L, et al .. Gravity increase before the 2015 Mw 7.8 Nepal earthquake[J]. Geophysical Research Letters , 2016, 43(1): 111-117.

ROTHLEITNER C, SVITLOV S, MERIMECHE H, et al .. Development of new free-fall absolute gravimeters[J]. Metrologia , 2009, 46(3): 283-297.

胡华, 伍康, 申磊, 等.新型高精度绝对重力仪[J].物理学报, 2012, 61(9): 542-549.

HU H, WU K, SHEN L, et al .. A new high precision absolute gravimeter[J]. Acta Physica. Sinica , 2012, 61(9): 542-549. (in Chinese)

滕云田, 吴琼, 郭有光, 等.基于激光干涉的新型高精度绝对重力仪[J].地球物理学进展, 2013, 28(4): 2141-2147.

TENG Y T, WU Q, GUO Y G, et al .. New type of high-precision absolute gravimeter base on laser interference[J]. Progress in Geophysics , 2013, 28(4): 2141-2147. (in Chinese)

冯金扬, 吴书清, 李春剑, 等.基于双干涉仪的自由落体绝对重力测量[J].光学精密工程, 2015, 23(10): 2740-2746.

FENG J Y, WU SH Q, LI CH J, et al .. Free-fall absolute gravity measurement based on double interferometers[J]. Opt. Precision Eng ., 2015, 23(10): 2740-2746. (in Chinese)

FALLER J E. Thirty years of progress in absolute gravimetry: a scientific capability implemented by technological advances[J]. Metrologia , 2002, 39(5): 425-428.

HU Z K, SUN B L, DUAN X C, et al .. Demonstration of an ultrahigh-sensitivity atom-interferometry absolute gravimeter[J]. Physical Review A , 2013, 88(4): 43610.

WU B, WANG Z, CHENG B, et al .. The investigation of a μGal-level cold atom gravimeter for field applications[J]. Metrologia , 2014, 51(5): 452-458.

NIEBAUER T M, SASAGAWA G S, FALLER J E, et al .. A new generation of absolute gravimeters[J]. Metrologia , 1995, 32(3): 159-180.

WESTRUM D, NIEBAUER T M. The diffraction correction for absolute gravimeters[J]. Metrologia , 2003, 40(5): 258-263.

Views

151

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Self-correction for resolver second harmonic angle measurement error

Improvement method for type A uncertainty of interferometric gravimeter

Tolerance assurance of interferometer for optical HCB process

Online detection of profile deviation for nano precision 2-D stage mirror

Design and experiments of micro motion platform based on a pair of flexible parallel six-bar linkages

Related Author

TIAN Limei

LU Ming

ZHANG Qiang

ZHANG Jiyang

WANG Yingguang

Chun-jian LI

Shu-qing WU

Duo-wu SU

Related Institution

Beijing Institute of Control Engineering

Division of Time and Frequency， National Institute of Metrology

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

University of Chinese Academy of Sciences

AI问答

Address：No.3888 Dong Nanhu Road, Changchun, Jilin, China Postal code：130033
Tel：0431-86176855 Email：gxjmgc@ciomp.ac.cn
Technical support is provided by Beijing Founder electronics co., LTD 吉ICP备11002662号-17 京公网安备11010802024621
It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.

⁰