通常测量结构应变的方法,是将应变计粘接于结构上,从而测量其随应变计电阻变化而变化的感应应变。半导体型应变计的发展大大改进了应变的测量,使它获得了更高的灵敏度和测量精度。然而,后来进展不大。本文利用应力波在压电材料中能产生一伴随的电波,而这电波又能产生一传播到该材料本身之外的磁场的基本原理,从而可以不与结构的应力部位 The usual method of measuring the strain of a structure is to bond the strain gage to the structure to measure the induced strain that varies with the strain gage resistance. The development of semiconductor strain gauges has greatly improved the measurement of strain, resulting in higher sensitivity and measurement accuracy. However, little progress later. In this paper, the use of stress waves in piezoelectric materials can generate a wave, which can produce a wave propagation to the magnetic field outside the material itself, the basic principles, which can not be the structure of the stress sites