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Improved compensation of vibrational noise in the laser interferometer with applications in absolute gravimetry

改进了激光干涉仪中振动噪声的补偿及其在绝对重力测量中的应用

基本信息

批准号：
190679127
负责人：
Dr. Sergiy Svitlov, Ph.D.
金额：
--
依托单位：
Institut für Erdmessung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/190679127?language=en
关键词：
Improved compensation vibrational noise laser

项目摘要

The project is devoted to the development and realization of an innovative concept of the vibration-compensated two-arm laser displacement interferometer in order to improve accuracy of absolute gravimetry. Within this concept the first channel (an absolute gravimeter) measures an additive combination of gravitational and vibrational accelerations, and the second one synchronously measures only vibrational accelerations, acting on the reference reflector, rigidly coupled with an accelerometer. Based on the developed theory of frequency-domain analysis of an absolute gravimeter, the relevant correction is computed and applied to the measurement result. The concept was proven during experiments with the free-fall absolute gravimeter of the Earthquake Research Institute of the University of Tokyo in Japan, where improvement of precision by factor 100 was observed. Within this continued project it is necessary to implement the project developments in different absolute gravimeters and adapt the developed data processing algorithms to actual measurement conditions. The main steps include development and modifications of the self-adaptive filtering algorithms and vibration compensation systems, development of digital fringe signal processing methods for symmetrical rise-and-fall absolute gravimeters and metrological characterization of the improved instruments at the Institute for Geodesy at the Leibniz University of Hanover (LUH) in Germany, Institute for Metrological Research (INRIM) in Italy and Earthquake Research Institute in Japan. The improved accuracy of absolute gravity measurements will have strong impacts on geophysics, volcanology, geodesy, inertial navigation and fundamental metrology.

该项目致力于开发和实现振动补偿双臂激光位移干涉仪的创新概念，以提高绝对重力测量的精度。在这个概念中，第一个通道（绝对重力计）测量重力和振动加速度的加和组合，第二个通道仅同步测量振动加速度，作用在参考反射器上，与加速度计刚性耦合。基于绝对重力仪频域分析的发展理论，计算相关校正并将其应用于测量结果。这一概念在日本东京大学地震研究所的自由落体绝对重力计实验中得到了证实，实验结果显示精度提高了 100 倍。在这个持续的项目中，有必要在不同的绝对重力计中实施项目开发，并使开发的数据处理算法适应实际测量条件。主要步骤包括德国汉诺威莱布尼茨大学大地测量研究所、意大利计量研究所和地震研究所的自适应滤波算法和振动补偿系统的开发和修改、对称升降绝对重力仪数字条纹信号处理方法的开发以及改进仪器的计量表征在日本。绝对重力测量精度的提高将对地球物理学、火山学、大地测量学、惯性导航和基础计量学产生重大影响。