This book will be of particular value to postgraduates, government and industrial researchers in the fields of mechanical. Squeezing interferometry for optical phase extraction in. Optimum tilt and defocusing in different interferogram analysis methods 422. Analysis of lau interferometric fringe for measurement of focal length by using wavelet filtering techniques.
Cryostat design, material properties, and superconductor criticalcurrent testing. Phase shifted, open fringe, lateral shear and other types of interferograms make use. In recent years, optical interferometrybased techniques have been widely used. Types of phase measurement techniques phase can be determined from either a number of interference fringe patterns or from a single inter. This book presents the theoretical principles and practical applications for classical and advanced interferometry in opticalmetrology. Digital processing of fringe patterns in optical metrology. Interferogram analysis, digital fringe pattern measurement. Interferogram analysisdigital fringe pattern measurement. Many whole field optical techniques provide the measurement data encoded as the phase of a periodic intensity profile. Automatic fringe analysis of twobeam interference patterns.
Kim2 1institut fur technische optik, universitat stuttgart, pfaffenwaldring 9, 70569 stuttgart, germany. Interferometric techniques are widely used for measuring a wide range of physical variables. Deep phase shifter for quantitative phase imaging qinnan zhang,1 shengyu lu,1 jiaosheng li,3 wenjie li,1 dong li,1 xiaoxu lu,3 liyun zhong 3 and jindong tian 1,2, 1college of physics and optoelectronic engineering, shenzhen university, shenzhen 518060, china 2guangdong laboratory of artificial intelligence and digital economy sz, shenzhen university 3guangdong provincial key. Interferometric techniques digital encyclopedia of applied. These devices allowed a substantial improvement in the accuracy of fringe location within an interferogram. Interferogram analysis, digital fringe pattern measurement techniques robinson, david w.
Digital fringe pattern measurement techniques bristol. Interferogram analysis digital fringe pattern measurement techniques edited by david w robinson and graeme t reid institute of physics publishing. Automatic fringe analysis of twobeam interference patterns for measurement of refractive index and birefringence pro. Reliable information about the coronavirus covid19 is available from the world health organization current situation, international travel. These measurements can be applied to stress, strain and vibration analysis, as well as to nondestructive testing and radiation dosimetry. Squeezed carrier interferogram for wavelet phase recovery vamara dembele, khalid assid.
Experimental techniques for lowtemperature measurements. The fringe pattern analysis genera lly consists of the phase evauaton methods 1 2. Phase shifted, open fringe, lateral shear and other types of interferograms make use of specific procedures to correctly retrieving the searched phase. Its now considered as a powerful tool for industrial measurements. Threedimensional angle measurement based on propagation. Advanced photonics journal of applied remote sensing journal of astronomical telescopes, instruments, and systems journal of biomedical optics.
Shakherapplication of digital speckle pattern interferometry and. The quadrature signal after hilbert transformation is. A selfcalibrating phaseshifting algorithm based on the natural demodulation of twodimensional fringe patterns kieran g. Lays out the fundamentals of, as well as computational methods for, studying fringe patterns produced by optical testing interferometersproviding beginners with the necessary background to enter this field and helping seasoned researchers to refine current analytical approaches. It usually consists of phase detection and phase unwrapping. Pdf digital image processing techniques are needed in order to. In optical measurement techniques and applications ed. Application of digital speckle pattern interferometry in. Sign in view cart help conference proceedings papers presentations journals. Popular interferometric measurement techniques include phase shifting interferometry psi, and vertical scanning interferometry vsi. Interferogram analysis for optical testing daniel malacara. It enables fullfield measurement of optical phase changes via the acquisition of speckle patterns. In interferometric measurements, interferograms fringe patterns are firstly recorded.
Read application of digital speckle pattern interferometry in measurement of large deformation, proceedings of spie on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A common problem in any interferogram analysis is the accuracy in locating fringe centers fringe skeleton. The methods, developed previously by one of the fringes maxima and minima, or the fringes. Selecting this option will search all publications across the scitation platform selecting this option will search all publications for the publishersociety in context. Some of these techniques will be illustrated using an interferogram of a vibrating diskl.
Introduction traditional singlewavelength interferometry cannot retrieve. These include temporal and spatial phase shifting interferometry, temporal and spatial phase unwrapping, and calculation of strain fields from the phase maps. Apr 28, 2016 brand management campaign management digital asset management email marketing lead. Automated fringe pattern analysis in experimental mechanics. The wide availability of digital image processing equipment prompted a number of studies to investigate different alternatives of automatic interfero. Phase unwrapping methods, in interferogram analysis. The phase shifting techniques temporal and spatial are proposed to process the. Brand management campaign management digital asset management email marketing lead generation marketing automation seo digital signage virtual. The analysis methods differ according to the interference fringes in the recorded holograms. Phase retrieval from the phaseshift moire fringe patterns in.
The attempt has been made to incorporate wavelet filtering techniques in the interferogram analysis, so as to improve the accuracy and precision of measurement. The computer algorithm searches for maxima and minima in the digitised interference pattern 9. Fizeau interferometry with automated fringe pattern analysis using. It enables fullfield measurement of optical phase changes via the acquisition of speckle t pa terns. A new algorithm for automatic double bright fringe of. Several investigators 19 proposed various digital imageprocessing algo. Fractional fringe order method using fourier analysis for. Single frame fringe pattern analysis for phase recovery. Osa fouriertransform method of fringepattern analysis for.
In this paper, a digital interferogram analysis method developed by becker unpub. A major novelty of this work is the use of the frequency transfer function ftf and the theory of stochastic process in fringe pattern analysis. Digital fringe pattern measurement techniques, eds d. This option allows users to search by publication, volume and page selecting this option will search the current publication in context. Afterwards we show why the pll system is not suitable for demodulating a single closedfringe interferogram. Moire pattern formed by two interferograms with a circular carrier 346 9.
Spatial phase shifting sps technique is useful for extracting quantitative displacement data from the system with only two. Moire pattern formed by two interferograms with a linear carrier 338 9. Analysis of lau interferometric fringe for measurement of. In this paper, digital interferogram analysis term. Interferometry is a family of techniques in which waves, usually electromagnetic waves, are superimposed, causing the phenomenon of interference, which is used to extract information. Osa fouriertransform method of fringepattern analysis. Interferometry is a family of techniques in which waves. The main procedure in automatic fringe pattern analysis is how to determine the contour line of the fringe pattern and interfringe spacing. We present a technique to provide, with good accuracy, the phase distribution from a single interferogram without unwrapping step and this by a new exploitation of the analytic signal corresponding to each intrinsic mode function, resulting from onedimensional empirical mode decomposition of the fringe pattern. And the syntheticwavelength interferogram could be obtained by a lowpass. Squeezed carrier interferogram for wavelet phase recovery. Different computer programs were developed to perform these steps and the digital interferogram analysis method uses these modules interactively to accomplish the required evaluation.
The second one fringe pattern analysis is faster, self calibrating, but suffers from. Threedimensional angle measurement based on propagation vector analysis of digital holography lingfeng yu,1, giancarlo pedrini,1 wolfgang osten,1 and myung k. A new method of using timeaveraged digital speckle pattern interferometry for the quantitative measurement of vibration amplitude was developed. The main objective of this book is to present the basic theoretical principles and practical applications for the classical interferometric techniques and the most advanced methods in the field of modern fringe pattern analysis applied to optical metrology. Fractional fringe order method using fourier analysis for absolute measurement of block gauge thickness.
Institute of physics publishing 2 cai l z, liu q, yang x l and wang y r 2003 phaseshift extraction and wavefront reconstruction in phaseshifting interferometry with arbitrary phase steps opt. Keywords keywordsfringe pattern analysis, speckle interferometry, moire. In the spatial phaseshifting techniques, several phaseshifted fringe patterns. Digital processing techniques for fringe analysis intechopen. The precision and reproducibility of psi is far greater than possible in static interferogram analysis, with measurement repeatabilities of a hundredth of a wavelength being routine. The method has advantages over moire topography and conventional fringe. Osa use of spatial phase shifting technique in digital. Single frame fringe pattern analysis for phase recovery with.
Digital image processing techniques are needed in order to recover the object information encoded in fringe patterns generated in a determined interferometric setup. Interferometer fringe pattern processing software for surface. One of the most common industrial applications of optical interferometry is as a versatile measurement tool for the high precision examination of surface topography. Numerous and frequentlyupdated resource results are available from this search. Reid national engineering laboratory, east kilbride, glasgow g75 oqu, uk abstract the wide availability of digital image processing equipment has led to the development of a large number of techniques for analysing interference fringe patterns. Both methods have their advantages and disadvantages. Article information, pdf download for automated fringe pattern analysis in experimental. Interferometric techniques digital encyclopedia of. Interferogram analysis digital fringe pattern measurement techniques edited by. Fringe analysis is the process of extracting quantitative measurement data from fringe or line patterns. Reid institute of physics publishing bristol and philadelphia, 1993 p. Types of phase measurement techniques phase can be determined from either a number of interference fringe patterns or from a single interferogram with appropriate fringe spacing. Two common techniques discussed below require that a large tilt be in. A fastfouriertransform method of topography and interferometry is proposed.
Optics and lasers in engineering 7 19867 3768 automatic fringe pattern analysis. Fringe analysis is a powerful optical technique with applications in mechanical engineering, nondestructive testing, and image processing. Interferometry is a branch of optical metrology responsible for using measurement techniques from the interference of two or more light beams. Interferogram analysis, digital fringe pattern measurement techniques david w. Automated, highspeed image processing techniques are used to analyse the fringe pattern and give an accurate analysis. Interferogram analysis, digital fringe pattern measurement techniques. These from all the views are needed to reconstruct the. Interferometric techniques 71 this end requires complicated hardware and alignment is critical kujawinska, 1993. Fringe analysis is a metrology technique for extracting measurement data from fringe patterns 1.
Determination of the zeroorder fringe position in digital. Both fringe tracking and fourier transform with phase unwrapping methods are used in the interpretation of interferometric fringe patterns. Interferometer fringe pattern processing software for. Frequencydivisionmultiplexing technique for imaging metrology. The editors have brought together a team of international authors to contribute chapters on their special areas of expertise. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wavefront form, which has not been possible by the fringecontourgeneration techniques. Temporal techniques require an applied phase shift between the. Interferogram analysis using image processing techniques. Intensity based analysis methods, in interferogram analysis. Larkin department of physical optics, school of physics,the university of sydney, nsw 2006, australia, and canon information systems research australia, 1 thomas holt drive, north ryde, nsw 21, australia. This paper discusses the problems involved in interferogram analysis and several image processing techniques to solve those problems. Pdf digital processing techniques for fringe analysis. Digital speckle pattern interferometry dspi and digital shearography ds are well known optical tools for qualitative as well as quantitative measurements of displacement components and its derivatives of engineering structures subjected either static or dynamic load. After the square of the moire fringe pattern, the additive moire pattern in equation 1 is turned into a multiplicative one.
In the case of a single interferogram the analysis consists of the following steps. Measurement data can be extracted by means of phase demodulation, a process for accurately. Quantitative vibration amplitude measurement with time. Interference pattern or interferogram showing circular fringes. There are two alternative approaches in interferometric topography. Holographic interpretation of moire patterns 352 references 354 10. After acquisition, a simple subtraction is usually performed to obtain a correlation fringe pattern. Reference sphere definition in wavefront measurement 418 12. There are a lot of computeraided algorithms, which depend on the interferogram types, used to fringe skeleton extraction of various digital interferogram.
A selfcalibrating phaseshifting algorithm based on the. Digital subtraction of the two images results in a correlation fringe pattern, where the fringes. Signal processing techniques especially the hilbert transformation for quantitative evaluation of the bessel fringes obtained in timeaveraged digital speckle pattern interferometry were explored. Oclcs webjunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. Discusses classical and stateoftheart fringe analysis techniques with exceptional clarity. Content management system cms task management project portfolio management time tracking pdf. However, formatting rules can vary widely between applications and fields of interest or study.
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