常用测量方法及传感器 measuring method and sensor
机械式mechanical
测力计forcemeter
可靠、便宜、蠕变reliable、cheap、creep deformation
电阻应变式strain measurement with bonding resistance
金属电阻应变片Metal foil strain wafer
(dR/R)/(dl/l)=1+2v
半导体应变片semiconductor gauge
电阻率变化resistivity
灵敏度高、非线性误差大sensitivity high、non-linear errors huge
电感式inductive sensor
自感型self-conductance
可变磁阻型variable reluctance
涡流传感器eddy displacement transducer
抗油污oil resistance
非接触式non-contact
互感型mutual conductance
差动变压器differential transformer
电容式capacitive sensor
面积变化型Resistor is big， circuit is difficult to design
压电式piezoelectric sensor
测量交变力alternative strain
例子
测量油缸位移measure the displacement of oil cylinder磁致伸缩 magnetostrictive sensor差动变压器 differential transformer滑线变阻器 sliding resistance
测量车的振动the vibration of engine压电、电容、应变、磁电
指标
灵敏度sensitivity
响应特性response characteristic
线性范围linearity range
精度precision
信号的处理signal processing
预处理preprocessing
滤波filtering
带通滤波器band-pass filter
恒带宽比滤波器Constant bandwidth ratio filter
带阻滤波器band-stop filter
高通high pass
低通low pass
信号数字化signal digitizationA/D
采样定理sampling theorem
混叠aliasing
泄漏 截断后leakage、cut off
window function
分析计算analysis
自相关函数self-correlation function
互相关函数cross-correlation function
测量装置的基本特性characteristics of metering equipment
温漂temperature excursion
零漂null shift
动态特性dynamic characteristics
负载效应load effect
two element have energy exchange
提高后级阻抗 improve final stage resistance增加放大器，高输入阻抗，低输出阻抗 amplification使用反馈 feedback
傅立叶变换flourier transform
狄里赫里条件Dirichlet's conditions
limited discontinuous point
limited maximum and minimum
Absolutely integrable
