面向深地探测的光纤重力梯度仪测量原理与研制进展  

Principle and development progress of fiber-optic gravity gradiometer for deep earth exploration

作　　者：王文伯 陈彦钧 朱兰鑫 黄慧敏 操玉文 曹新宇 周子奇 周桐 何妍 时方朔 李正斌[1] WANG WenBo;CHEN YanJun;ZHU LanXin;HUANG HuiMin;CAO YuWen;CAO XinYu;ZHOU ZiQi;ZHOU Tong;HE Yan;SHI FangShuo;LI ZhengBin(State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Electronics,Peking University,Beijing 100871,China;School of Software and Microelectronics,Peking University,Beijing 102600,China;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China)

机构地区：[1]北京大学电子学院,区域光纤通信网与新型光通信系统国家重点实验室,北京100871 [2]北京大学软件与微电子学院,北京102600 [3]北京大学信息科学技术学院,北京100871

出　　处：《地球物理学报》2024年第2期809-819,共11页Chinese Journal of Geophysics

基　　金：国家重点研发计划(2019YFC1509501);国家自然科学基金(U1939207,62201016)资助.

摘　　要：发展深地探测技术对于推进地球物理发展有重要意义.基于重力梯度的深地传感技术具备自身独有的优势,可以有效弥补现有主要方法的局限.本文提出了一种基于光纤Sagnac干涉仪的重力梯度测量原理,将重力梯度转化为角加速度并利用光纤角加速度计进行精密传感.本文设计了重力梯度原型样机,并利用ANSYS有限元仿真论证了其可行性与稳定性,在此基础上对光纤重力梯度原型样机进行了长达14天的连续静态测试,得到角加速度测量本底噪声低于3×10^(-10)rad·s^(-2)·Hz^(-1/2),对应重力梯度测量噪声达0.68 E·Hz^(-1/2).基于光纤Sagnac干涉仪的重力梯度测量没有对传感单元一致性的要求,无需复杂的环境控制与辅助设备,测试结果展现了其高灵敏度特性以及应用于深地探测的巨大潜力.It is of great significance to develop deep earth exploration technology for advancing the development of geophysics.Deep earth exploration technology based on gravity gradient has its own unique advantages and can effectively make up for the limitations of existing methods.In this paper,a gravity gradient measurement principle based on fiber-optic Sagnac interferometer is proposed.The gravity gradient is converted into angular acceleration and the fiber-optic angular accelerometer is used for precision sensing.The structure of the prototype is designed,and its feasibility and stability are demonstrated by finite element simulation using ANSYS software.On this basis,the static test of the prototype is carried out continuously for 14 days.The results show that the self-noise of angular acceleration measurement is lower than 3×10^(-10)rad·s^(-2)·Hz^(-1/2),and the corresponding contribution for the gravity gradient measurement is estimated to 0.68 E·Hz^(-1/2).The gravity gradient measurement based on fiber-optic Sagnac interferometer has no requirement on the consistency of sensing units and the complex environmental control equipment.The test results show its high sensitivity and great potential for deep earth exploration.

关 键 词：深地探测 重力梯度 光纤角加速度计 

分 类 号：P315[天文地球—地震学]