【作者】 郑柱；

【导师】 陈丽；

【作者基本信息】 广东工业大学 ， 物理电子学， 2008， 硕士

【摘要】 在工程材料力学中,变形后的梁弯曲轴线称为挠曲轴线,简称挠曲线。它反映了材料的力学性质,是研究材料特性的重要参数。对梁挠曲线测量研究时,由于弯曲度小,无法用常规的方法进行测量,因此常用激光全息法,但此方法不仅需要显影、定影等湿处理手段,还需要暗房操作等条件,限制了光学检测技术在实际工程中的应用。本文根据电子散斑相关技术具有实时、全场、快速、无须暗房操作等特点。首先,将电子散斑干涉技术应用到研究梁的形变位移测量中,实现了光学检测技术由实验走向实际应用,但由于它对测量环境的抗干扰能力较低,给实时检测带来了影响。因此,本文主要阐述了电子剪切散斑干涉测量技术,介绍它的系统组成与测量原理,分析研究了剪切散斑中各种位相测量的方法,并讨论了在不同测量条件下各方法对精度的影响。其次,将电子剪切散斑干涉技术应用到实验研究中,分别运用电子剪切散斑干涉技术时间相移法和空间载波Fourier变换法对典型试件的位移导数场进行求解,将实验结果与理论值进行比较分析,证实了电子剪切散斑干涉技术空间载波Fourier变换法在实际检测中不仅具有近似于时间相移法的精度,还显示出其动态测量的优势。第三,分别将电子散斑相关技术应用到实际工程材料力学检测中。应用电子散斑干涉技术时间相移法对梁形变的位移场进行测量,并与理论解进行比较分析。应用电子剪切散斑干涉技术时间相移法、空间载波Fourier变换法对梁形变的位移导数场进行测定,得出了其形变位移导数场分布图,通过与理论计算数值的比较分析,进一步显示了电子剪切散斑干涉技术空间载波Fourier变换法作为一种实用的测量方法,将会在工业检测中获得广泛的应用。更多还原

【Abstract】 The deformation of beam bending axis(deflection) is an important parameter that reflects the mechanical properties of material. However, it is not convenient to measure the parameter by normal measuring method because of its less bending percentage. Usually, it is measured by the laser holography method. The method needs not only humidity processing, but also darkroom operation. Therefore, the application of the laser holography method is limited in the engineering practice.First of all, according to the real-time, whole-field and fast character of the related technology of Electric Speckle Pattern Interferometry (ESPI), the ESPI is used to measure the deformation displacement of beam and make the optical detection technology be used in the practical application. But the influence of environment vibration to the measurement errors is big. So the principle of Electric Shearography Speckle Pattern Interferometry(ESSPI) is stated briefly in this paper. Its system composition and measurement theory was introduced, and all of these phase measuring methods in ESSPI and the influence to the precision of these phase measuring methods was discussed.Then, the ESSPI was used in the experimental research. The temporal phase-shift method(TPM) and Spatial carrier Fourier transform method(SCFTM) of ESSPI were used to solve the differential field of displacement of the edge-clamped round board respectively. Comparing the experimental result with the theoretical result, which proves that the Spatial carrier Fourier transform method is much more superiority in dynamic inspection and has approximate precision to the temporal phase-shift method.At the last, the related technology of Electric Speckle Pattern Interferometry was used in the engineering material mechanics measurement respectively. The temporal phase-shift method of ESPI was used to measure the displacement of deformation of the beam. Its result was compared with the theoretical. And then the temporal phase-shift method and Spatial carrier Fourier transform method of ESSPI were used to measure the displacement gradient of deformation of the beam. By comparing with the theoretical results, the experimental results show that Spatial carrier Fourier transform method is a very useful measuring method and may be widely used in the engineering application.更多还原