FG5X-246绝对重力仪准确度测试

发布时间：2019-04-23 20:58

【摘要】：利用最新研制的一套弱力测试平台,对FG5X-246绝对重力仪观测值准确度指标进行了测试试验。通过弱力测试平台升降装置改变扰动质量体与测量点之间的距离,从而改变测量点处叠加的扰动引力场大小。通过比较FG5X-246绝对重力观测值变化量与理论扰动引力场变化量之间的差异,从而确定FG5X-246绝对重力观测值的准确度。测试结果显示当扰动质量体从1.810 4 m高度降到1.409 9m高度时,外部扰动引力场变化了48.81 μGal(1Gal=1cm/s~2),FG5X-246绝对重力仪感应到48.0 μGal的重力变化,FG5X-246绝对重力仪测量值与理论值之差为0.81 μGal。当扰动质量体从1.810 4m降到1.010 1m高度时,外部扰动引力场变化了-15.44 μGal,FG5X-246绝对重力仪感应到-16.20 μGal的重力变化,测量值与理论值之差为0.76 μGal。当扰动质量体从1.409 9 m降到1.010 1m高度时,外部扰动引力场变化了-64.20 μGal,FG5X-246绝对重力仪感应到-64.25 μGal的重力变化,测量值与理论值之差为0.05 μGal。上述测量结果表明,此次FG5X-246绝对重力仪感应到外部引力变化的误差均不超过1 μGal,即其测量值准确度优于1 μGal。
[Abstract]:The accuracy index of FG5X-246 absolute gravimeter is tested by using a newly developed weak force testing platform. The distance between the disturbance mass volume and the measurement point is changed by the lifting device of the weak force test platform, thus the magnitude of the disturbance gravitational field superimposed at the measurement point is changed. The accuracy of FG5X-246 absolute gravity observation is determined by comparing the difference between the variation of FG5X-246 absolute gravity observation and the variation of theoretical perturbation gravitational field. The test results show that the external disturbance gravitational field changes 48.81 渭 Gal (1Gal=1cm/s~2) when the disturbance mass volume decreases from 1.810 4 m to 1.409 9 m, and the FG5X-246 absolute gravimeter can sense the gravity change of 48 8 渭 Gal. The difference between the measured and theoretical values of FG5X-246 absolute gravimeter is 0.81 渭 Gal.. When the disturbance mass volume decreases from 1.810 m to 1.010 1m, the external disturbance gravitational field changes from-15.44 渭 Gal,FG5X-246 absolute gravimeter to-16.20 渭 Gal, and the difference between the measured value and the theoretical value is 0.76 渭 Gal.. When the perturbed mass volume decreases from 1.409 9 m to 1.010 1m, the external disturbance gravitation field changes from-64. 20 渭 Gal,FG5X-246 absolute gravimeter to-64. 25 渭 Gal gravity change. The difference between the measured value and the theoretical value is 0. 05 渭 Gal.. The results show that the error of the FG5X-246 absolute gravimeter induced by external gravitation is less than 1 渭 Gal, that is, the accuracy of the measurement is better than that of 1 渭 Gal..
【作者单位】：中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室;中国科学院大学;
【基金】：国家重大科研装备研制项目(ZDYZ2012-1-04) 国家自然科学基金(41574073;41374086;40974044)~~
【分类号】：P223.1

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