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  李彩华,李小军,滕云田,胡星星,刘成.数字化力平衡加速度传感器设计与应用[J].震灾防御技术,2018,13(4):839-850, DOI:10.11899/zzfy20180411.

数字化力平衡加速度传感器设计与应用
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。
作者单位
李彩华 中国地震局地球物理研究所, 北京 100081 
李小军 中国地震局地球物理研究所, 北京 100081 
滕云田 中国地震局地球物理研究所, 北京 100081 
胡星星 中国地震局地球物理研究所, 北京 100081 
刘成 中国地震局地球物理研究所, 北京 100081 
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
DOI:10.11899/zzfy20180411
基金项目:中国地震局地球物理研究所院所长基金(DQJB15B03)
收稿日期:2018-01-22
作者简介:李彩华,女,生于1974年。副研究员。主要从事地震仪器研发、地震仪器质量检测等工作。E-mail:caihli_2004@163.com
通讯作者:
Design and Application of Digital Force Balanced Accelerometer
Abstract:      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 △-Σ 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 21.6bit effective resolution. The high-speed ARM board with a 4-core 1.4GHz×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 1000Hz sampling rate, USB interface, cable network and so on.
Keywords:  Force balanced accelerometer  Digital  High precision analog-to-digital conversion  Large dynamic range
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