Three Dimensional Deformation Measurements with Digital Holography

Digital holography is a kind of optical information processing technology with digital method. It is a combination of traditional holography and modern electronic technology. By the way of recording and processing the holographic image by digital method, it is not adopted the traditional holographic photographic way of chemical processing, so that the processing is simplified. It is also convenient to improve the quality of the image and to extract the needed information by digital image processing. In this paper, charged coupled device (CCD) has been applied to holographic interferometry combined with electrical addressable liquid crystal display (EALCD), which adds new content and method to the development and application of holography. On the basis of theory analysis, a new method that combined image plane hologram with doubleexposure holographic interferometry, and combined CCD with EALCD is used in three dimensional deformation measurements. This method has been improved feasible by optical experiment. Keywords-digital holography; CCD; EALCD; deformation measurement; digital image processing; image plane holography