Digital Holography in Flatness and Crack Investigation

Metrology and Measurement Systems

Fedia Abdel-Aziz¹  Niveen Maaboud¹  Mohamed El-Bahrawi¹ 

关键词: digital holography;    fringe analysis;    flatness testing;    crack investigation;   

DOI  :  10.2478/v10178-010-0047-z

来源: Versita

【 摘 要 】

Digital holography (DH) which is the technology of acquiring and processing measurement data via a CCD camera is spreading to industrial applications, finds wide employment in engineering problems of testing and investigation. In this paper, a simple digital holographic system, comprising a He-Ne laser source, CCD camera and analyzing software, is used for testing surface flatness and detecting the presence of a propagating crack on the surface plane and the effect of the crack on the neighborhood. Phase variations across the surfaces planes are extracted to represent the surface deviation from a reference plane. The analysis methods differ according to the interference fringes in the recorded holograms. Both fringe tracking and Fourier transform with phase unwrapping methods are used in the interpretation of interferometric fringe patterns.

【 授权许可】

Unknown