用电阻片测量构件表面的应力,应变片的电阻变化很小,信号很弱,推不动记录仪器,所以要将信号不失真地放大许多倍的这种特殊放大装置称为应变仪。正如大家所知,应变仪如配用相应的电阻应变式传感器,亦可测量各种形态的压力、拉力、扭矩、位移、振幅、速度、加速度等物理量。电阻应变测量具有一系列优点,目前在世界各国乃是非电测量的主要手段之一,且在技术领域中的应用更加日益广泛。电阻应变仪的发展是和电子技术的发展分不开的,而集成电路、数字电路迅速发展使电阻应变仪的面貌焕然一新,它正朝着多点、高精度、自动化、数字化和数据自动处理的方向 Resistive pieces of the surface of the stress measurement, strain gauge resistance change is small, the signal is weak, pushing the recording equipment, so the signal is not magnified many times to enlarge this special amplification device called the strain gauge. As we all know, such as strain gauges with the appropriate resistance strain sensor can also measure various forms of pressure, tension, torque, displacement, amplitude, velocity, acceleration and other physical quantities. Resistance strain measurement has a series of advantages, at present in all countries in the world is one of the main means of non-electrical measurement, and in the field of technology is more and more widely used. The development of resistance strain gauges is inseparable from the development of electronic technology. The rapid development of integrated circuits and digital circuits has brought the appearance of resistance strain gauges into a new look. It is moving toward multi-point, high-precision, automatic, digitized and data automatic processing direction