前言应变测量技术广泛地应用在工程技术上,以测量工作状态下材料中所受的应力。它具有使用方便,灵敏度高,稳定性好,并能作远距离测量等优点,为实现难于用理论分析决定的应力测量,提供了可靠的手段。这不但对直接验证设计理论,确定设计方案,检验工程质量,合理选用材料等起着重要的作用,而且在某些特殊工作环境下(如在流体压力下,在核 Foreword Strain gauging technology is widely used in engineering techniques to measure the stresses encountered in materials under working conditions. It is easy to use, high sensitivity, good stability, and can make long-distance measurements, etc., in order to achieve difficult to use theory to determine the stress measurement, provides a reliable means. This not only plays an important role in directly verifying the design theory, determining the design scheme, checking the project quality and selecting the materials reasonably, but also in some special working environments (for example, under the fluid pressure,