这部分将介绍怎样选用传感器及其基本工作原理和应用中应注意的一些问题。一、变形测量传感器力作用于物体时,该物体会伸缩。如果伸缩不超出弹性限度,应力σ和应变ε有下列关系:σ=Eε。式中 E 为物体的弹性模量。由此式可见,通过检测应变ε可测知应力σ。应变的检测常选用应变计,或用内含应变计的力检测器等。通常应变计构成电桥形式,当应变计感受应变时,它的电阻值将随之变化,其变化量表示为:△R=k△ε。其中△R 为应变计电阻值的变化量,△ε为应变 This part will introduce how to choose the sensor and its basic working principle and some problems that should be noticed in the application. First, the deformation measurement sensor force acting on the object, the object will be retractable. If the stretching does not exceed the elastic limit, the stress σ and the strain ε have the following relationship: σ = Eε. Where E is the elastic modulus of the object. From this formula, we can detect the stress σ by detecting the strain ε. Strain detection often use strain gauges, or with strain gauges containing force detectors. Usually strain gauge bridge form, when the strain gauge feel strain, its resistance will change, the amount of change is expressed as: △ R = k △ ε. Where ΔR is the amount of change in strain gauge resistance, Δε is the strain