Development of ESPI camera for diagnosis of material degradation

电子散斑干涉技术（ESPI）是一种很有前途的实验技术。该技术的发展使观测变形的动态特征成为可能，我们称之为动态ESPI （DESPI）。在本报告中，首先，(1)发展动态ESPI （DESPI）诊断材料降解。(2)引入了基于物理细观力学的场理论解释来评价退化。研究塑性变形过程的动态行为具有重要意义。(3)新提出的DESPI使研究全场变形的全过程成为可能。(4)在铝合金试样和不锈钢试样的拉伸试验中，发现了在试样上传播的特征应变局部化。(5)对散斑条纹进行了定量分析。(6)设计制作了一种小型DESPI相机，并对其疲劳过程进行了研究。(7)将提出的非接触方法应用于植物生长状态等生物物体运动特征的研究。(8)进一步将该方法应用于微观物体的变形研究。应用Micro-DESPI对MEMS运动特性进行诊断。(9)最后提出对未来的期望。

Electronic Speckle Pattern Interferometry (ESPI) is a promising experimental technique whole-field deformation analysis. The technique has been developed to make possible to observe dynamic feature of deformation which we call dynamic ESPI (DESPI). In this report, at first, (1)development of dynamic ESPI (DESPI) for diagnosis of material degradation is present. (2)To evaluate degradation, field theoretical interpretation based on physical meso-mechanics is introduced. It is important to investigate dynamic behavior of plastic deformation process. (3)Newly proposed DESPI makes possible to investigate entire process of whole field deformation. (4)In tensile experiments of aluminum alloy samples and stainless steal samples, we found characteristics strain localization which propagate on the samples. (5)Quantitative analysis of speckle fringes are also presented. (6)A compact DESPI camera was designed and produced and fatigue process were investigated. (7)The proposed method, which is non-contact method, was applied to investigate moving feature of bio-objects such like growing state of a plant. (8)Further more the proposed method was progressed to investigate deformation of microscopic object. Micro-DESPI was applied to diagnose moving feature of MEMS. (9)Finally future expectation will be presented.