石英加速度计电流信号测量系统设计与实现  

Design of current signal measurement system for quartz accelerometer

作　　者：赵雷[1] 纪文昕 齐航天 张晓林[1] ZHAO Lei;JI Wenxin;QI Hangtian;ZHANG Xiaolin(School of Electronic Information Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《传感器与微系统》2021年第9期78-80,84,共4页Transducer and Microsystem Technologies

摘　　要：以某航天飞行器加速度计电流信号测量项目为背景,对8个十倍程(160 dB)范围内纳安(nA)级微弱电流的测量探讨了三种方法:电流-电压(I-V)线性转换测量,电流-频率(I-F)转换测量,电流-电压(I-V)对数转换测量。提出了I-F转换和高位模/数(A/D)转换的对比模型和I-V对数转换的分辨率转换的对应关系。采用电流-电压(I-V)对数转换测量方法制作6通道采集板卡,经北京东方计量测试研究所测量证明能完成160 dB动态范围,误差小于10%的电流测量。Based on the current signal measurement project of an aerospace vehicle accelerometer,three methods are discussed for measurement of nA weak current in the range of 8 decuple(160 dB):current-voltage(I-V)linear conversion measurement,current-frequency(I-F)conversion measurement,and current-voltage(I-V)logarithmic conversion measurement.The comparison model of I-F conversion and high AD conversion is built innovatively.The resolution transformation effect of I-V logarithmic conversion is proposed.The current-voltage(I-V)logarithmic conversion measurement method is used to make the 6-channel acquisition board card,which is proved by Beijing Oriental metrology and testing institute to be able to complete the current measurement within 160 dB and error less than 10%.

关 键 词：电流测量 宽量程 模/数转换器(ADC)采样 电压频率转换器 量化位数 对数放大 

分 类 号：TN91[电子电信—通信与信息系统]