项目名称: 原子干涉重力测量中磁场梯度效应研究
项目编号: No.11204094
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 物理学I
项目作者: 段小春
作者单位: 华中科技大学
项目金额: 30万元
中文摘要: 高精度重力测量在地球物理、地下勘探和惯性导航等领域有着重要的应用。在高精度原子干涉重力测量中,干涉区磁场梯度会引起不可忽略的偏差。本课题拟利用磁敏感原子干涉仪对干涉区的磁场梯度进行精确测量,根据测量结果计算出磁场梯度引起的偏差,并与实验结果对比。通过双原子喷泉同时差分测量的方法,实现磁场梯度测量精度好于1μG/mm,以此来解决我们采用原子干涉仪在10^(-10)g水平测量重力加速度实验中磁场梯度引起的偏差问题。另外,本方法还可以应用于原子喷泉钟、原子干涉重力梯度仪、陀螺仪等精密测量中。
中文关键词: 原子干涉仪;重力测量;磁场梯度;;
英文摘要: Precise gravity measurements have important applications in geophysics, underground structure detection and inertial-sensor navigation. In precise atom-interferometry gravity measurements, the magnetic-field gradient in interference region, will induce unnegligible bias. In this program, the magnetic-field gradient in interference region is planned to be precisely measured using magnetic-sensitive atom interferometry, and then the corresponding bias will be calculated, which will be compared with the experimental result. The precision of measuring magnetic-field gradient is expected to be better than 1μG/mm by adopting the simultaneous differential measurment using double atomic fountains, based on which the bias induced by magnetic-field gradient is expected to be alleviated in our gravity measurement by atom interferometry aimed at 10^(-10)g level. In addition, this method can be applied in atomic fountain clocks, atom interferometry gradiometers and atom gyroscopes.
英文关键词: atom interferometry;gravity measurement;magnetic-field gradient;;