基于光纤的三维电子散斑干涉测量系统设计

为了实现物体三维变形非接触测量，设计了基于电子散斑干涉技术的三维变形测量系统。该系统中采用了一分五型分束光纤，这根光纤在系统中起到分光和传光的作用，使系统所需器件相比一般的设计系统要少。为了获得变形的量化数值，系统将电子散斑技术与相移技术结合在一起，由压电陶瓷引入相移，并采用“4+1”相移算法计算变形量。该系统可以实现面内及离面变形的独立测量，进而实现物体三维变形的测量。以带缺陷的木板和钢板为测试对象，进行了物体面内、离面和三维变形的测量，结果表明设计系统可以实现各种变形的测量。

Design of 3 D ESPI system by optical fiber

In order to realize the non-contact measurement of three dimensional deformation of the tested object, the three dimensional deformation measurement system based on electronic speckle pattern interferometry(ESPI) is designed. In this designed system, the one-to-five type fiber is one part to dispart and propagate light., which making the designed measurement system sample. Combining ESPI and the phase-shifting technique to get the quantitative deformation measurement. And PZT is used to shift the phase, the deformation results are calculated by “4+1” phase-shifting algorithm. The designed system can realize the in-plane and out-plane deformation measurement respectively, further, three dimensional deformation measurement of the tested object can be gotten. The experimental results of the in-plane, out-plane and three dimensional deformation for the wood block with defect and the steel plate with stress validate the designed system.