数字化力平衡加速度传感器设计与应用  

Design and Application of Digital Force Balanced Accelerometer

作　　者：李彩华[1] 李小军[1] 滕云田[1] 胡星星[1] 刘成 Li Caihua;Li Xiaojun;Teng Yuntian;Hu Xingxing;Liu Cheng(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《震灾防御技术》2018年第4期839-850,共12页Technology for Earthquake Disaster Prevention

基　　金：中国地震局地球物理研究所院所长基金(DQJB15B03)

摘　　要：在传统模拟式力平衡加速度传感器技术的基础上,通过改进传感器机械结构、内嵌高精度采集器等方法,设计了1款数字化力平衡加速度传感器。针对传感器中三通道模数转换要求完全同步、高分辨率、高采样率等技术难点,本文选用高精度ADS1294模数转换器,以同1个驱动信号完成三通道同步模数转换,实现低干扰、高分辨率的模数转换;采用高速ARM微处理器对模数转换数据进行大容量数据存储、高速数据通讯、数据处理、波形显示和电源管理;采用高精度线性电源芯片作为可开关控制的高精度电源,实现仪器整机低功耗管理。该数字化力平衡加速度传感器实现了大动态测量范围、三通道同步数据转换、高达1000Hz的采样率,且具有网络通讯接口等功能。A new digital force balanced accelerometer(DFBA) with multiple interfaces was designed in this paper, in which a integrated and orthogonal to each other three-component mechanical base was designed. The magnetic field intensity and mass were changed in the mechanical base. A high precision analog-to-digital circuit board and a high-speed ARM board were embedded in this DFBA. The high precision analog-to-digital circuit board was designed with three 24 bit resolution(35)-? analog-to-digital convertors ADS1294. So it is capable of three channels synchronous analog-to-digital conversion. Five kinds of linearity power supply chips were selected to design high-precision analog powers. Which allows three-channel AD conversion achieved 21.6 bit effective resolution. The high-speed ARM board with a 4-core 1.4 GHz×4 high speed CPU and multiple interfaces was used in this digital force balanced accelerometer. This DFBA can provides large dynamic range, three channels synchronous analog-to-digital conversion with low power consumption, up to 1000 Hz sampling rate, USB interface, cable network and so on.

关 键 词：力平衡加速度传感器 数字化 高精度模数转换 大动态范围 

分 类 号：P315.7[天文地球—地震学]