数字化力平衡加速度传感器设计与应用

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。

Design and Application of Digital Force Balanced Accelerometer

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.