| 绝对重力仪研制中一种新的自由落体轨迹重建算法 |
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| 引用本文： | 吴琼,滕云田,黄大伦,龙剑锋.绝对重力仪研制中一种新的自由落体轨迹重建算法[J].地震学报,2012,34(4):549-556. |
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| 作者姓名： | 吴琼 滕云田 黄大伦 龙剑锋 |
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| 作者单位： | 1) 中国北京100081中国地震局地球物理研究所 2) 中国北京100013中国计量科学研究院 |
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| 基金项目： | 中国地震局地球物理研究所基本科研业务费 |
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| 摘 要： | 真空系统中落体做自由下落运动的轨迹重建算法,是进行拟合求解绝对重力测量结果的关键步骤之一.在自主研制小型高精度激光干涉绝对重力仪的过程中,基于目前高速发展的数字测量技术,提出一种自由落体轨迹重建的算法.其基本原理是:首先通过高速采样,得到落体自由下落过程中产生的一系列数字化的激光干涉信号；其次通过数字处理算法提取干涉信...
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| 关 键 词： | 绝对重力仪 自由落体 过零点计算 轨迹重建 |
A new type of algorithm for rebuilding the trace of free-fall body in absolute gravimeter development |
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| Wu Qiong
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Teng Yuntian
,
Huang Dalun
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Long Jianfeng.A new type of algorithm for rebuilding the trace of free-fall body in absolute gravimeter development[J].Acta Seismologica Sinica,2012,34(4):549-556. |
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| Authors: | Wu Qiong Teng Yuntian Huang Dalun Long Jianfeng |
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| Institution: | 1) Institute of Geophysics, China Earthquake Administration, Beijing 100081, China2) National Institute of Metrology P.R.China, Beijing 100013, China |
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| Abstract: | Rebuilding the trace of a free-fall body in the vacuum is one of the key steps in finding gravitational acceleration from the sampled fringe signals.This paper proposed an algorithm for rebuilding the trace during the independent process of developing small Laser Interference Absolute Gravimeter.The basic principles are : ① Computing the time of the points before and after zero-crossing of a completely sampled fringe signal,which is generated by a freely falling body,and getting the time coordinates of zero-crossing points;② Dividing these time coordinates to get the Time-Displacement Coordinates in the bodytrace using the same displacement interval.In the experiment,we found that it needs 2.5sto complete one calculation,the average timing accuracy is ±0.01ns,the induced error is 5.2×10 -12 m / s 2,and one complete measurement time is 15s.The results satisfy the demand of the measurement speed and the accuracy in developing the high precision laser interference absolute gravimeter. |
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| Keywords: | absolute gravimeter free-fall body calculation of zero-crossing trace rebuilding |
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