Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326079
H. El-khozondar, M. S. Muller, T. Buck, R. El-Khozondar, A. Koch
The twist induced polarization rotation in birefringent optical fibers is well understood and has been treated in the late seventies. We recently derived a formulation of the polarization rotation in twisted optical fibers using a tensorial coupled mode approach, that, other than existing theories, employs a fixed reference frame. This is interesting for fiber sensing applications, where the perturbing effects onto the fiber, such as strains induced by embedding the fiber into a host material, are conventionally given in a fixed laboratory reference frame. Hence, the derived theory can easily be integrated into existing formulations in the laboratory reference frame. In this work we demonstrate the experimental verification of the derived theory.We mechanically twist an optical fiber using an automated test stand and recording the change in polarization. The results are in close agreement with the theory.
{"title":"Experimental investigation of polarization rotation in twisted optical fibers","authors":"H. El-khozondar, M. S. Muller, T. Buck, R. El-Khozondar, A. Koch","doi":"10.1109/ISOT.2009.5326079","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326079","url":null,"abstract":"The twist induced polarization rotation in birefringent optical fibers is well understood and has been treated in the late seventies. We recently derived a formulation of the polarization rotation in twisted optical fibers using a tensorial coupled mode approach, that, other than existing theories, employs a fixed reference frame. This is interesting for fiber sensing applications, where the perturbing effects onto the fiber, such as strains induced by embedding the fiber into a host material, are conventionally given in a fixed laboratory reference frame. Hence, the derived theory can easily be integrated into existing formulations in the laboratory reference frame. In this work we demonstrate the experimental verification of the derived theory.We mechanically twist an optical fiber using an automated test stand and recording the change in polarization. The results are in close agreement with the theory.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130913091","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326119
Yasuhiro Toyama, Yukio Sato, Ikuji Honda
A 3-D to 3-D face verification technique is described in the paper. A practical 3-D face scanner that captures both texture and range images is used for registration and verification. The posture of an input 3-D face image is normalized for matching it to the registered 3-D face image. The criterion of stableness of face region is defined for the prior verification. The stable regions are considered to be useful for the matching and the verification. In the experiment, the stable face regions are analyzed and a superior verification rates are obtained.
{"title":"3-D face verification with 3-D face scanner","authors":"Yasuhiro Toyama, Yukio Sato, Ikuji Honda","doi":"10.1109/ISOT.2009.5326119","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326119","url":null,"abstract":"A 3-D to 3-D face verification technique is described in the paper. A practical 3-D face scanner that captures both texture and range images is used for registration and verification. The posture of an input 3-D face image is normalized for matching it to the registered 3-D face image. The criterion of stableness of face region is defined for the prior verification. The stable regions are considered to be useful for the matching and the verification. In the experiment, the stable face regions are analyzed and a superior verification rates are obtained.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134344138","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326076
E. Kayahan, O. Gundogdu, F. Hacizade, H. Nasibov
When a surface is illuminated with a highly coherent light such as a laser beam, the speckle pattern of bright and dark regions is observed. It depends on the surface parameters and carries important information about the roughness of the surface. Various methods and techniques are employed for the determination of surface roughness parameters from speckle pattern properties. In this paper, an experimental approach for surface roughness evaluation based on the autocorrelation analysis of the spectral properties of speckle patterns caused by milled metal surfaces is reported. The speckles at three 633, 604 and 543 nm wavelengths of He-Ne laser were analyzed. It was found that autocorrelation analysis is very sensitive to small variations in speckle sizes, caused by spectral properties of speckle patterns such as increasing the wavelength lead to increased speckle sizes. The results are in good agreement with the results obtained from the mechanical stylus profilometer for the milled metal surfaces with roughness values Ra; 0.36µm (low roughness) and 1.98µm (high roughness). The technique reported here has a great potential for precise and non-contact optical measurements of rough surfaces.
{"title":"Autocorrelation analysis of spectral dependency of surface roughness speckle patterns","authors":"E. Kayahan, O. Gundogdu, F. Hacizade, H. Nasibov","doi":"10.1109/ISOT.2009.5326076","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326076","url":null,"abstract":"When a surface is illuminated with a highly coherent light such as a laser beam, the speckle pattern of bright and dark regions is observed. It depends on the surface parameters and carries important information about the roughness of the surface. Various methods and techniques are employed for the determination of surface roughness parameters from speckle pattern properties. In this paper, an experimental approach for surface roughness evaluation based on the autocorrelation analysis of the spectral properties of speckle patterns caused by milled metal surfaces is reported. The speckles at three 633, 604 and 543 nm wavelengths of He-Ne laser were analyzed. It was found that autocorrelation analysis is very sensitive to small variations in speckle sizes, caused by spectral properties of speckle patterns such as increasing the wavelength lead to increased speckle sizes. The results are in good agreement with the results obtained from the mechanical stylus profilometer for the milled metal surfaces with roughness values Ra; 0.36µm (low roughness) and 1.98µm (high roughness). The technique reported here has a great potential for precise and non-contact optical measurements of rough surfaces.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124428596","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326153
Jin-kyoung Oh, J. Choi, Dong-Whan Lee, T. Ha, H. Lee
We describe the fabrication and performance of micro-mirror for silica waveguides on silicon substrate. The micro-mirror consists of four facets, which is produced by wet-etching a pyramid-shaped pit on the backside of the Si-substrate and transferring it to silica waveguide by dry-etching. This mirror couples waveguide light normal to waveguide plane. We developed a trench-filled 0.45Δ% Ge-doped borosilicate glass waveguide by flame hydrolysis deposition method to achieve flat surface all over the mirror facet. We observed from scanning electron microscope (SEM) observations that 45° mirror angle and smooth mirror surface is achieved. The propagation loss of the waveguide including the micro-mirror is measured to be 0.1 dB/cm at 1.55 µm wavelength.
{"title":"45° micro-mirror for out-of-plane coupling of silica-based optical waveguide on si substrate","authors":"Jin-kyoung Oh, J. Choi, Dong-Whan Lee, T. Ha, H. Lee","doi":"10.1109/ISOT.2009.5326153","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326153","url":null,"abstract":"We describe the fabrication and performance of micro-mirror for silica waveguides on silicon substrate. The micro-mirror consists of four facets, which is produced by wet-etching a pyramid-shaped pit on the backside of the Si-substrate and transferring it to silica waveguide by dry-etching. This mirror couples waveguide light normal to waveguide plane. We developed a trench-filled 0.45Δ% Ge-doped borosilicate glass waveguide by flame hydrolysis deposition method to achieve flat surface all over the mirror facet. We observed from scanning electron microscope (SEM) observations that 45° mirror angle and smooth mirror surface is achieved. The propagation loss of the waveguide including the micro-mirror is measured to be 0.1 dB/cm at 1.55 µm wavelength.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124762120","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326117
Hagen Broistedt, M. Petz, R. Tutsch
The vast majority of current force measurement methods determine the deformation of an elastic body to measure the effective force. The leading sensor technology in this market segment is the resistance strain gauge. Because of the measurement principle the stain gauge has some drawbacks. For instance, the measurement suffers from the so-called creeping and a local weakening of the elastic element is necessary to create sufficient local strains. This is also a reason for this technique being limited with respect to the measurement of dynamic loads. In order to overcome these limitations, in this paper a new contactless working geometric-optical displacement transducer is proposed. An optical lever principle is used to reach the required high position resolution to measure the force-induced deformation of an elastic body.
{"title":"Force transducer based on a geometric-optical displacement sensor","authors":"Hagen Broistedt, M. Petz, R. Tutsch","doi":"10.1109/ISOT.2009.5326117","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326117","url":null,"abstract":"The vast majority of current force measurement methods determine the deformation of an elastic body to measure the effective force. The leading sensor technology in this market segment is the resistance strain gauge. Because of the measurement principle the stain gauge has some drawbacks. For instance, the measurement suffers from the so-called creeping and a local weakening of the elastic element is necessary to create sufficient local strains. This is also a reason for this technique being limited with respect to the measurement of dynamic loads. In order to overcome these limitations, in this paper a new contactless working geometric-optical displacement transducer is proposed. An optical lever principle is used to reach the required high position resolution to measure the force-induced deformation of an elastic body.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130285976","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326125
Jeong-Hwan Lee, Joon-Kil Kim, Sun-Kyu Park, Kiyoun Kwon, Doo-Jin Choi, Jin-Hyung Park, Youngjun Park
In this paper, we describe the development and implementation of mono laser vision system which is used to measure large scale panels with various beveled-edges in the ship-building processes. Our laser vision system comprises of a mono camera including 4 laser-diodes and an optical band pass filter using triangulation technique. As clearly seen from this configuration, we can use only one camera to measure the edge points of large scale panels. Image processing which is an effective method to search for an edge point amongst various beveled edge shapes is presented below. Also to evaluate the below proposed algorithm, experiments were performed under real ship building environments.
{"title":"Development of mono laser vision system for 3D measurement of panels with various bevel edges","authors":"Jeong-Hwan Lee, Joon-Kil Kim, Sun-Kyu Park, Kiyoun Kwon, Doo-Jin Choi, Jin-Hyung Park, Youngjun Park","doi":"10.1109/ISOT.2009.5326125","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326125","url":null,"abstract":"In this paper, we describe the development and implementation of mono laser vision system which is used to measure large scale panels with various beveled-edges in the ship-building processes. Our laser vision system comprises of a mono camera including 4 laser-diodes and an optical band pass filter using triangulation technique. As clearly seen from this configuration, we can use only one camera to measure the edge points of large scale panels. Image processing which is an effective method to search for an edge point amongst various beveled edge shapes is presented below. Also to evaluate the below proposed algorithm, experiments were performed under real ship building environments.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130740597","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326166
L. Ponce, C. Leo-Lim, M. Arronte, E. de Posada, E. Rodriguez, T. Flores
A new optical method for detection of spines during the laser de-thorning process is presented. The spines detection is performed by on-line measurement of reflectance using a low power 532 nm, CW Nd:YAG laser. It's demonstrated that the method avoids enhancing the throughput and efficiency of laser dethorning of opuntia.
{"title":"Optical detection of nopal spines for laser de-thorning process","authors":"L. Ponce, C. Leo-Lim, M. Arronte, E. de Posada, E. Rodriguez, T. Flores","doi":"10.1109/ISOT.2009.5326166","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326166","url":null,"abstract":"A new optical method for detection of spines during the laser de-thorning process is presented. The spines detection is performed by on-line measurement of reflectance using a low power 532 nm, CW Nd:YAG laser. It's demonstrated that the method avoids enhancing the throughput and efficiency of laser dethorning of opuntia.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"292 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116307926","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326064
A. Cenko, Jeff T. Meade, B. Behr, A. Hajian
Radial velocity (RV) of stellar targets were measured using a dispersed Fourier transform spectrometer (dFTS). The instrument used a laser based optical metrology system in cooperation with a mechanical metrology system to measure the absolute position of the retro-reflectors in the dFTS with a precision of 0.1 nm. The combined metrology system data allowed stellar RV measurements to be precise at the 10 m/s level, or about 0.1% relative error with respect to the RV amplitude. The dFTS instrument is well suited for precise RV measurements, and is less cumbersome to calibrate and operate than echelle spectrometers - a competing instrument for RV measurements of stellar targets.
{"title":"A dispersed fourier transform spectrometer with intrinsic optical metrology for stellar radial velocity measurements","authors":"A. Cenko, Jeff T. Meade, B. Behr, A. Hajian","doi":"10.1109/ISOT.2009.5326064","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326064","url":null,"abstract":"Radial velocity (RV) of stellar targets were measured using a dispersed Fourier transform spectrometer (dFTS). The instrument used a laser based optical metrology system in cooperation with a mechanical metrology system to measure the absolute position of the retro-reflectors in the dFTS with a precision of 0.1 nm. The combined metrology system data allowed stellar RV measurements to be precise at the 10 m/s level, or about 0.1% relative error with respect to the RV amplitude. The dFTS instrument is well suited for precise RV measurements, and is less cumbersome to calibrate and operate than echelle spectrometers - a competing instrument for RV measurements of stellar targets.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128113124","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326161
Y. Bellouard, A. Said, M. Dugan, P. Bado
We show that locally altering fused silica with femtosecond laser irradiation forms the basis for a novel manufacturing technology platform to produce highly integrated microsystems. In contrast to many common approaches that rely on combining materials to achieve particular functions, our scheme utilizes a single piece of material, whose properties are locally modified using femtosecond laser irradiation. This microsystem fabrication method is not only particularly attractive for optofluidics instruments but also for optomechanical devices.
{"title":"Monolithic integration in fused silica: When fluidics, mechanics and optics meet in a single substrate","authors":"Y. Bellouard, A. Said, M. Dugan, P. Bado","doi":"10.1109/ISOT.2009.5326161","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326161","url":null,"abstract":"We show that locally altering fused silica with femtosecond laser irradiation forms the basis for a novel manufacturing technology platform to produce highly integrated microsystems. In contrast to many common approaches that rely on combining materials to achieve particular functions, our scheme utilizes a single piece of material, whose properties are locally modified using femtosecond laser irradiation. This microsystem fabrication method is not only particularly attractive for optofluidics instruments but also for optomechanical devices.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128253855","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}
Pub Date : 2009-11-10DOI: 10.1109/ISOT.2009.5326105
Metin Tarhan, Erdinç Altu
Nowadays, Unmanned Air Vehicles (UAVs) have become more and more important. These vehicles are employed in many applications from military operations to civilian tasks. Under situations where global positioning system (GPS) and inertial navigation system (INS) do not function, or as an additional sensor, vision systems can be used. In recent years omnidirectional camera usage has experienced a remarkable increase. In many fields innovative research has been done by this camera which captures 360° view in a single frame. However, employment of omnidirectional cameras in UAVs is very new. In this paper, we present the use of catadioptric systems in UAVs. The parallel lines that exist on many structures in an urban environment are used by the algorithm for the estimation of the attitude of the UAV. After explanation of the algorithm, the UAV modelling and control will be presented. Various simulations have been done to present the effectiveness of the estimation algorithms as well as the UAV controllers. Finally, we will present the experiments and the results of the estimation and control algorithms on a real model helicopter.
{"title":"Control of a quadrotor air vehicle by vanishing points in catadioptric images","authors":"Metin Tarhan, Erdinç Altu","doi":"10.1109/ISOT.2009.5326105","DOIUrl":"https://doi.org/10.1109/ISOT.2009.5326105","url":null,"abstract":"Nowadays, Unmanned Air Vehicles (UAVs) have become more and more important. These vehicles are employed in many applications from military operations to civilian tasks. Under situations where global positioning system (GPS) and inertial navigation system (INS) do not function, or as an additional sensor, vision systems can be used. In recent years omnidirectional camera usage has experienced a remarkable increase. In many fields innovative research has been done by this camera which captures 360° view in a single frame. However, employment of omnidirectional cameras in UAVs is very new. In this paper, we present the use of catadioptric systems in UAVs. The parallel lines that exist on many structures in an urban environment are used by the algorithm for the estimation of the attitude of the UAV. After explanation of the algorithm, the UAV modelling and control will be presented. Various simulations have been done to present the effectiveness of the estimation algorithms as well as the UAV controllers. Finally, we will present the experiments and the results of the estimation and control algorithms on a real model helicopter.","PeriodicalId":366216,"journal":{"name":"2009 International Symposium on Optomechatronic Technologies","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115548192","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}
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