Systems of Optical Security最新文献

Miniature fiber optic spectrometer: response functions and bandpasses 微型光纤光谱仪:响应函数和带通

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475970

P. Hlubina, P. Stejskal

{"title":"Miniature fiber optic spectrometer: response functions and bandpasses","authors":"P. Hlubina, P. Stejskal","doi":"10.1117/12.475970","DOIUrl":"https://doi.org/10.1117/12.475970","url":null,"abstract":"Response functions and bandpasses of a miniature fiber optic spectrometer with three read fibers of different core diameters are measured both interferometrically and directly. In interferometrically measured response functions and bandpasses, timedomain and spectral-domain interference oftwo light beams from a laser diode TOLD 9140 operated below the threshold is utilized. It is revealed, in accordance with the theory, that the visibility function for the spatial interference fringes measured in the Michelson interferometer configuration with a broadband detector consists of a Gaussian central peak whose width gives the source spectral width. Similarly, it is revealed, in accordance with the theory, that the visibility functions for the spectral interference fringes measured in the Michelson interferometer configuration by the fiber optic spectrometer are the functions related to the spectrometer response functions whose widths give overall bandpasses. Subtracting the effect of the source spectral width, the spectral bandpasses of the fiber optic spectrometer are determined. In directly measured response functions and bandpasses, the delta-function spectrum of the same laser diode operated far above the threshold is utilized. It is revealed, in accordance with the theoretical assumptions, that the response functions are Gaussian functions. These are compared with the interferometrically measured bandpasses confirming good agreement.","PeriodicalId":156625,"journal":{"name":"Systems of Optical Security","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129584329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magneto-optical patterned structure for magnetic field sensing 磁场传感用磁光图像化结构

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475974

D. Ciprian, J. Pistora, I. Kopriva, S. Marcet

{"title":"Magneto-optical patterned structure for magnetic field sensing","authors":"D. Ciprian, J. Pistora, I. Kopriva, S. Marcet","doi":"10.1117/12.475974","DOIUrl":"https://doi.org/10.1117/12.475974","url":null,"abstract":"In non-destructive testing, the magnetic yokes in combination with Hall sensors are frequently used. Such types of sensing circuits are suitable for defect specification with axial geometry lower limit about one hundred micrometers. For inspection of smaller cracks and breaks (less than 10 micrometers) ,the Bi-garnet strip detectors are available. These structures can bring the information related to defect position, but the specification of the defect shape seems to be problematic. One of the possible solutions of this problem can be the using of patterned magnetic thin film structure, which would allow to determine the quality of the inspected body (the number of defects) and in the same time to solve the problem of defect shapes. Such structure can consist of thin magnetic film with in-plane magnetic anisotropy. The anisotropy can be influenced by external magnetic field (for example by stray field from a crack) -the result is the rotation of magnetization in the film plane. This effect can be detected using magneto-optical techniques. When the shape of the crack is in question, the film patterned into 2D grating could respond by the changes of magneto-optical diffraction (polarization properties of the light in various diffraction orders are changed) . The paper is oriented on the experimental study of such structure performed by means of magneto-optical Kerr ellipsometry. Magnetic properties were studied by Kerr (reflection) magneto-optical ellipsometry at 670 nm using differential intensity detection. The measurements were realized in various diffraction orders and the results were compared with the magneto-optical data obtamed from continuous layer. Experimental results and theoretical models support the idea to apply periodical structures with magnetic ordering as sensor unit in diagnostic and measurement processes.","PeriodicalId":156625,"journal":{"name":"Systems of Optical Security","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132098790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conditioning of the signal to be acquired from a photoplethysmographic sensor 对从光容积脉搏传感器获得的信号进行调理

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475977

M. Boltrukiewicz, A. Cysewska-Sobusiak

引用次数: 1

Investigation of dynamic parameters of ophthalmic tonometric transducers 眼压传感器动态参数的研究

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475979

A. Hachol, M. Grabowska

引用次数: 0

Remote, spectral photo-elastic sensor and portable spectrometer for environment monitoring 用于环境监测的远程、光谱光弹性传感器和便携式光谱仪

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475981

J. Konwerska-hrabowska

引用次数: 0

Ceramics of Pb094Ba006(Zr052Ti048)O3+0.5%La2O3 for active elements of pyroelectric detectors 热释电探测器的有源元件为Pb094Ba006(Zr052Ti048)O3+0.5%La2O3

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475985

W. Proszak

引用次数: 1

Generalized method of m-line spectroscopy for studying biological samples 研究生物样品的广义m线光谱学方法

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475980

E. Auguściuk, M. Roszko, A. Domanski

引用次数: 0

Bistatic tomographic sensing of the environment 环境的双基地层析传感

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475988

M. Kugeiko, D. M. Onoshko

引用次数: 0

Measuring distances and displacements by an interferometric technique using a low-resolution miniature fiber optic spectrometer 用低分辨率微型光纤光谱仪测量距离和位移的干涉测量技术

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475973

P. Hlubina, I. Gurov

{"title":"Measuring distances and displacements by an interferometric technique using a low-resolution miniature fiber optic spectrometer","authors":"P. Hlubina, I. Gurov","doi":"10.1117/12.475973","DOIUrl":"https://doi.org/10.1117/12.475973","url":null,"abstract":"The feasibility of the technique utilizing the spectral-domain two-beam interference resolved by a low-resolution miniature fiber optic spectrometer is demonstrated in measuring distances and displacements when two different light sources are used. First, when a low-coherence source, namely a multimode laser diode TOLD 9 140 is used in the configuration of a dispersive Michelson interferometer, a cross-correlation procedure between the measured and the theoretical spectral interferograms is applied to estimate the group optical path differences (OPDs) between beams corresponding to different positions of one of the mirrors of the interferometer and needed in the displacement evaluations. Second, when a white-light source, namely a halogen lamp is used in the configuration of a non-dispersive Michelson interferometer, the measured spectral interferograms are processed by a phase locked loop (PLL) method, which is a special simplified version of the general recurrence non-linear data processing method previously presented, to obtain the corresponding group OPDs between beams in the interferometer or the displacements. The PLL method is realized in iterative mode which provides the unwrapped spectral fringe phase recovery. The accuracy of the iterative PLL method is investigated via processing the measured spectral interferograms.","PeriodicalId":156625,"journal":{"name":"Systems of Optical Security","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129037232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Detection of combustion instabilities using the wavelet transform in industrial conditions 用小波变换检测工业条件下的燃烧不稳定性

Systems of Optical Security Pub Date : 2002-07-23 DOI: 10.1117/12.475972

W. Wójcik, A. Kotyra, P. Komada, T. Golec

引用次数: 2