旋转加速度计重力梯度仪前放电路的分析与设计  

Analysis and design of preamplifier circuits for gravity gradiometer of rotating accelerometer

作　　者：丁昊[1] 蔡体菁[1] 

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《中国惯性技术学报》2014年第3期400-403,共4页Journal of Chinese Inertial Technology

基　　金："十二五"863主题项目(2011AA060501)

摘　　要：根据旋转加速度计重力梯度仪的测量原理，其前放电路可以分为电流放大、求和运算、求差运算和带通滤波四个功能部分。首先推导了将电路输出噪声折算到重力梯度仪输入端的计算方法；其次分析了前放电路是电路噪声的主要来源，并以低噪声为前放电路的首要设计目标，研究了前放电路增益和运放的噪声指标之间的关系，比较了10-8~10-11g各个精度级别的加速度计对电路增益和运放噪声指标的最低需求。最后通过对研制的前放电路的试验测量证明了分析的合理性。According to its working principle, the fore-end circuit in gravity gradiometer of rotating accelerometer can be divided into for four parts which are current amplifiers, adders, substracters and band-pass filters. In this paper, the method of evaluating the RTI (refer to input) noise of the gradiometer circuit is reduced. As the main noise source of the circuit system, the ultimate goal of the fore-end circuit design is lower noise. Then the relationship between the circuit gain and the op-amp noise specifications are studied to compare the minimum requirements with the accelerometer precision varying from 10-8g to 10-11g. The measure results of the developed circuit prove the rationality of the analysis.

关 键 词：重力梯度仪 旋转加速度计 噪声分析 运算放大器 电路设计 

分 类 号：U666.1[交通运输工程—船舶及航道工程]