Journal ArticleDOI
Fringe multiplication methods for digital interferometric fringes.
Reads0
Chats0
TLDR
Three fringe multiplication methods are proposed which use a digital image processing technique to multiply various interferometric fringes, easy to handle and greatly improve the measurement accuracy.Abstract:
Holographic moire fringes can be multiplied by using diffraction interferometry, an approach which is not applicable to some other interferometric techniques such as geometric moire. Three fringe multiplication methods are proposed which use a digital image processing technique to multiply various interferometric fringes. These methods are easy to handle and greatly improve the measurement accuracy. They enlarge the testing range for applying the interferometric techniques.read more
Citations
More filters
Journal ArticleDOI
Interferometric methods with enhanced sensitivity by optical/digital fringe multiplication
TL;DR: The equations of the optical/digital fringe multiplication method are derived for a general periodic distribution of intensity versus phase and are demonstrated by a shadow moiré experiment, which ideally produces fringe patterns with a triangular intensity distribution.
Patent
Process and device for determining three-dimensional structure in the submicron range
TL;DR: In this paper, the authors proposed a method for defining a three-dimensional structure of an object having a submicrometer size by splitting a coherent electromagnetic radiation beam into two partial beams including a first partial beam and a second partial beam.
Journal ArticleDOI
Constructing pure digital secondary moiré patterns
TL;DR: In this paper, a new method of constructing pure digital secondary moire patterns of equal-strain fringes is proposed, which eliminates the backnoise of primary fringes and gives the strain value at every point over the whole strain field.
Journal ArticleDOI
Some improvement on digital fringe-multiplication methods
TL;DR: The digital subtraction-doubling method for photoelasticity is improved and extended in this paper, which is suitable for any other interferometric fringe patterns which have the expression of eq (1).
Journal ArticleDOI
Enhanced sensitivity digital holographic interferometry.
TL;DR: A method of digital holographic interferometry is proposed that enables detection with enhanced sensitivity of corona discharges generated in the symmetrical point-plane geometry by post-processing thedigital holographic recordings with a set of point-wise image operations.
References
More filters
Journal ArticleDOI
Image processing applied to the interactive analysis of interferometric fringes
TL;DR: A computer software system for performing interferometric fringe analysis interactively (FAI) based on a general-purpose image-processing system running on a DEC PDP-11 that permits manual definition of difficult fringe-pattern boundaries.
Journal ArticleDOI
Complete automatic analysis of photoelastic fringes: A new method of evaluation of photoelastic-fringe pattern by means of modern image-processing technique is presented in this paper
R. K. Müller,L. R. Saackel +1 more
TL;DR: In this paper, a minicomputer connected to a video-frame store has direct access to any picture point in the store, and it is possible to evaluate the photo-elastic-fringe pattern in the computer by special developed software.
Journal ArticleDOI
Automatic moire contouring.
TL;DR: A method of automatically reconstructing the 3-D surface of an object from a 2-D moire pattern has been extended to interpret ambiguous fringe patterns by displacing the object.
Journal ArticleDOI
Spin filtering processes and automatic extraction of fringe centerlines in digitial interferometric patterns
TL;DR: Two filtering algorithms-spin filter and binary spin filter-suitable for various digital interferometric images are presented in this paper and a process for automatically extracting fringe centerlines all over the field is proposed.
Journal ArticleDOI
The determination of the components of the strain tensor in holographic interferometry
TL;DR: In this article, the general problem of obtaining the derivatives of the displacements in holographic interferometry is analyzed, and a data-reduction method is proposed for the most general case.