Journal ArticleDOI
Dual-beam symmetric illumination-observation TV holography system for measurements
Reads0
Chats0
TLDR
In this article, instead of observing along the optical axis, the scattered light along the direction of the illumination beams, and imaged it as two separate images onto the photo sensor of a CCD camera, was used for real-time evaluation of in-plane displacement components as well as surface shape.Abstract:
The Leendertz dual-beam symmetric illumination-normal ob- servation arrangement is widely employed for real time evaluation of in-plane displacement components as well as surface shape. Instead of observing along the optical axis, we have examined the Leendertz ar- rangement by observing the scattered light along the direction of the illumination beams, and imaged it as two separate images onto the photo sensor of a CCD camera. The interferometer is a combination of two channels, each of which measures independently and simulta- neously the information pertaining to either the in-plane displacement component of a deformation vector, or the surface relief variation of a three-dimensional object. In addition, a summary of possible measure- ments that can be carried out from the present arrangement is also high- lighted. Experimental results using a four-frame phase shifting technique are illustrated. © 2001 Society of Photo-Optical Instrumentation Engineers.read more
Citations
More filters
Journal ArticleDOI
Recent developments in digital speckle pattern interferometry
TL;DR: This poster presents a poster presenting a probabilistic procedure to constrain the response of the immune system to chemotherapy-like injuries in mice.
Journal ArticleDOI
Three-dimensional displacement measurement by using reversed phase-shifting electronic speckle pattern interferometry
TL;DR: In this paper, a reference beam is added to a dual-beam symmetric illumination electronic speckle pattern interferometry (ESPI) system and shared by the two illuminations.
Book ChapterDOI
Speckle Methods and Applications
TL;DR: In this paper, a three-dimensional interference pattern formed by the interference of secondary, dephased wavelets scattered by an optical rough surface or transmitted through a scattered medium that imposes random phases of the wave.
References
More filters
Journal ArticleDOI
Electro-Optic Holography System For Vibration Analysis And Nondestructive Testing
TL;DR: In this article, a TV system was developed for detecting and displaying a two-dimensional hologram image that permits concomitant (real-time) hologram interferometry, where a uniform reference field interferes at zero offset angle with a speckled image of an object.
Journal ArticleDOI
Measurement of three-dimensional displacement fields and shape using electronic speckle photography
TL;DR: In this paper, a stereoscopic electronic speckle photography system is presented that detects 3-D displacement fields or object shape with subpixel accuracy, and data are stored, results are presented, and calculations are performed in a PC computer.
Journal ArticleDOI
The design and application of a speckle pattern interferometer for total plane strain field measurement
TL;DR: In this article, the basic principles of plane strain measurement using speckle pattern interferometry are summarized and a detailed description of a new design of interferometer which provides the required geometries is presented.
Journal ArticleDOI
Electronic speckle pattern interferometry for simultaneous measurement of out-of-plane displacement and slope
TL;DR: An optical configuration is presented for simultaneous measurement of out-of-plane displacement and slope change in electronic speckle pattern interferometry.
Journal ArticleDOI
Detection of defects in composite materials by TV holography
O.J. Løkberg,J.T. Malmo +1 more
TL;DR: In this paper, TV holography or ESPI is used to reveal extremely small movements and abnormal surface behaviour of the test object, which can be used to detect and study defects and structural weaknesses in composite materials.