三、力和压力检测器在力或压力检测器中,应用最普遍的是电阻应变式和压磁式二种。1.电阻应变式力和压力传感器利用电阻应变原理作成的拉压力传感器如图4-41所示。在应变筒上粘贴电阻片R_1、R_2、R_1、R_2作为电桥的半桥;另半桥R_3R_4可在仪器(应变仪)上,也可贴在应变筒上。加供桥电压u_1后,当应变筒不受力时,使R_1R_4=R_2R_3,电桥平衡无输出;受拉力时,轴向拉伸电阻R_1增大,横向收缩 Third, the force and pressure detector In the force or pressure detector, the most common application is the resistance strain and pressure magnetic two. 1. Resistance strain force and pressure sensor The strain gauge strain gauge made of strain gauge is shown in Figure 4-41. The resistance tube on the strain gauge tube R_1, R_2, R_1, R_2 as a bridge half bridge; the other half R_3 R_4 instrument (strain gauge) can also be attached to the strain tube. When the bridge voltage u_1 is applied, when the strain tube is not stressed, R_1R_4 = R_2R_3 will be balanced with no output of the bridge. When the tension is applied, the axial stretching resistance R_1 will increase and the transverse contraction