重复性
钟摆
万用表
度量(数据仓库)
计量系统
石英
惠斯通大桥
声学
加速度计
计算机科学
近似误差
准确度和精密度
样品(材料)
观测误差
材料科学
电气工程
机械工程
物理
电压
电阻器
工程类
数学
算法
操作系统
统计
复合材料
热力学
数据库
量子力学
天文
作者
Bin Xu,Chenyan Wang,Jianglong Ma,Sijian Lin,Bin Tang,Peng Gui,Kai Liu
摘要
A quartz pendulum, gold plated on both sides, is the core component of a quartz accelerometer. Currently, a two-wire manual measurement method is employed to measure the resistance at 24 key positions on the gold plating to evaluate manufacturing quality. This method is time-consuming and has poor repeatability. In this paper, an automatic measurement system is proposed to measure these 24 resistances. The proposed system consists primarily of a lab-designed holder that clamps the sample, a machine vision unit to measure the sample position, RXY-stages for precise positioning, two lab-designed probes with 48 needles to sense the electrical signals, a multichannel self-switching module to sample the electrical signals from the probe needles, and a 7½-digital multimeter to measure the resistances. In addition, a simple, precise pre-measurement positioning method is introduced here. Experimental results show that the quartz-pendulum resistances can be measured quickly and precisely using the proposed system. The measurement rate of 1 pendulum/min is a factor of 10 faster than the current manual method, the measurement stability error is only 0.9 mΩ (a relative error of 0.13%), and the measurement repeatability error is 1.2 mΩ (a relative error of 0.20%).
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