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全息摄影已成为测量形变的新型干涉计,它不像旧式的干涉计需要一套精密的光学装备。如全息摄影干涉照片可以把一个在自由的和激励状态的目标的图象连续记录在一张简单的全息摄影薄板上。干涉照片以多次曝光的方法把目标的瞬间形变全部以干涉条纹的方式记录下来。全息摄影干涉计预计不久即将成为试验人员测量在不同环境条件下材料响应的新方法。这种方法的特点是:(1)全息照片上所能看到的物体表面上任何一点的表面形变均可测出,(2)脉冲激光技术从基本上消除了目标变化过程中对全息照片形成的影响,(3)运用激光的同步操作最便于研究某一特定情况的时间性质,(4)来自研究目标的辐射或来自其恶劣背景的辐射在拍摄干涉照片过程中不影响所需要的光学信息。应用连续波和脉冲技术的一些初步试验说明这种新的形变测量技术。试验结果证明这种方法的优越性。
Holography has become a new type of interferometer for measuring deformation, unlike the old-style interferometers that require a sophisticated optical set. Such as holographic interference photos can be a free and motivated images of the target continuous record in a simple holographic sheet. Interference photos to multiple exposure methods to target the instantaneous deformation of all the way to record the interference fringes. Holographic interferometers are expected to soon become a new way for experimenters to measure material response under different environmental conditions. The characteristics of this method are: (1) surface deformation at any point on the surface of the object that can be seen on a hologram can be detected, (2) pulsed laser technology basically eliminates the formation of holograms during the target change (3) the simultaneous operation of lasers makes it easier to study the temporal nature of a particular situation, (4) radiation from research objectives or radiation from its harsh background does not affect the required optical information during photographing . A few preliminary experiments using CW and pulse techniques illustrate this new technique of strain measurement. The test results prove the superiority of this method.