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Optomechatronic Technologies (ISOT), 2012 International Symposium on

Date 29-31 Oct. 2012

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  • [Title page]

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  • 2012 International Symposium on Optomechatronic Technologies (ISOT) [Copyright notice]

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  • Paper list

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  • Author award list

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  • Author list

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  • Exploration of brain function through behavior, neural activity observation, and optogenetic manipulation

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1849 KB) |  | HTML iconHTML  

    A microscope imaging system to open black boxes in brains is presented. The system is capable of simultaneously recording behaviors and neural activities of a freely moving organism with high temporal resolution. A high-speed camera is used to estimate the locations of the target and keep it inside visual field. A high-sensitivity camera records the response of the interested neuron in the brain. Optogenetics techniques are of special importance to analyze the functionality of the neuron, i.e., an element in the black box. The talk will present our trial to use robotics with optogenetics for estimating the structure of stimulus-behavior systems in organisms. View full abstract»

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  • On-chip integrated lasers for biophotonic applications

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB) |  | HTML iconHTML  

    Meeting the need of biomedical users, we develop disposable Lab-on-a-Chip systems based on commercially available polymers. We are combining passive microfluidics with active optical elements on-chip by integrating multiple solid-state and liquid-core lasers. While covering a wide range of laser emission wavelengths, the chips have the size of microscope cover slips and use optical and fluidic interconnects only. Here, we present our latest realizations of integrated optofluidic lasers using whispering gallery mode or distributed feedback laser cavities. View full abstract»

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  • 3D fiber probe: State of the art and new developments

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1082 KB) |  | HTML iconHTML  

    Increasing manufacturing accuracy requirements enforce the development of innovative and highly sensitive measuring tools. Fiber probes combine classical tactile measurement with optical read out. These probes allow extremely small contact force and reach measurement uncertainties better than a micrometer. To even further reduce these values, a new measuring principle based on interferometry is being developed. View full abstract»

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  • Positioning sensor with nanometric performances over centimetric range for nanotechnology sample-holders

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

    Nowadays, nanometer resolution and accuracy in many nanotechnology processes are required. But accuracy is in general opposed with range. High resolution over a wide range has been made possible using interferometric translation stages, in other words by combining metrology with classical mechanical motions. The interferometry is obviously a good solution. Nevertheless, its sensitivity to the medium index its price make it prohibited in many applications. In parallel of several works on interferometry, a lot of studies have been started to develop simple sensors or measurement systems gathering simplicity, high resolution over long range and low price potentialities [1-7]. We developed an optical sensor for centimeter range measurements with nanometric resolution. Simulation and modeling can be found in [8]. Here, the principle is detailed and experimental results are pointed out according to modeling results. We plan to use this sensor with a nano-displacement platform nano-manipulation and for a sample-holder in microscopy or lithography process. View full abstract»

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  • Multi-scale data organization and management of 3D moving objects based on GIS

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1452 KB) |  | HTML iconHTML  

    How to describe 3D moving objects motion model of good adaptability, how to present and store moving objects data in database and realize the self-adaptive dynamic visualization of 3D moving objects with positioning and communication information, are the key problems on data organization and management of 3D moving objects. The information about 3D moving objects are references with the location and time, including the real time geographic information. This paper proposes a new method of multi-scale data organization and management of 3D moving objects based on GIS. The 3D-terrain is rendered with triangle subdivision bi-tree data structure and LOD, which are easy to realize the rapid visualization for 3D moving objects. The experiments show that the propose method is suitable to 3D moving objects in large-scale complex virtual environments. View full abstract»

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  • Fast tracking system for multi-colored pie-shaped markers

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1964 KB) |  | HTML iconHTML  

    In this study, we develop a real-time high-speed color vision system to track multi-colored pie-shaped markers in 512×512 images at 2000 fps. Our color vision system has six cell-based labeling circuits that can calculate the 0th and 1st moment features of color-labeled regions during a single scan of a 512×512 image divided into 4096 8×8 cells. Our system examines the geometric distribution of five color regions in each pie-shaped marker using their 0th and 1st moment features, and it can simultaneously extract the unique marker codes, locations, and orientations of multiple pie-shaped markers in a 512×512 image at 2000 fps. To evaluate the performance of our system, we performed several experiments to track multi-colored pie-shaped markers printed on high-speed rotating objects. View full abstract»

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  • Twin-scale vernier micro-pattern for visual measurement of 1D in-plane absolute displacements with increased range-to-resolution ratio

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3278 KB) |  | HTML iconHTML  

    This paper presents a visual method for 1D in-plane displacement measurement which combines a resolution of a few nanometers with an unambiguous excursion range of 168μm. Furthermore, position retrieval is only based on elementary phase computations and thus might become compatible with high-rate processing by implementing the processing algorithm on high speed computing architectures like a DSP or a FPGA device. The method is based on a twin scale Vernier micro-pattern fixed on the moving target of interest. The two periodic grids have slightly different periods in order to encode the period order within the phase difference observed between the two sub-patterns. As a result, an unambiguous range of 168μm is obtained from grid periods of 8μm and 8.4μm. The resolution is evaluated to be of 11.7nm despite remaining mechanical disturbances. Differential measurements demonstrated indeed a measurement accuracy better than 5nm. View full abstract»

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  • Accurate iris and eyelid tracking method for Gaze Estimation without calibration

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (798 KB) |  | HTML iconHTML  

    Today, there is a great demand for an easier and more useful Gaze Estimation system, whereas most gaze estimation systems require special equipment or complex calibration. In this report, we propose a new method which tracks iris and eyelid automatically without any calibration, which will be useful gaze estimation in daily lives. Eyelid shape tracking is useful for more accurate iris tracking and user's state estimation. View full abstract»

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  • Shape completion and modeling of 3D foot shape while walking

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1369 KB) |  | HTML iconHTML  

    We developed a technology for creating homologous models of foot shape data obtained from a 4D measurement system. Homologous models consist of the same number of the same topology, and each data point in the model is defined based on the anatomical homology. In the present modeling technology, we use a homologous model using a polyhedral template. By fitting the homologous foot model to data obtained from 4D measurement system, our approach can accomplish homologous modeling for 4D-measured data. We show how the model can be used for shape completion and modeling -generating a complete surface mesh and granting anatomical feature points given a limited set of captured points specifying the target shape. Using principal component analysis (PCA) and posture change, we accomplish homologous modeling for 4D-measured data of human foot shape. View full abstract»

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  • Accuracy of triangulation method sensor with optical skid

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2226 KB) |  | HTML iconHTML  

    To measure a profile on a machine accurately, it is necessary to remove influences caused by various disturbances such as vibration. Vibration between a workpiece and a sensor causes measurement error on machine measurements. Therefore, the authors proposed a sensor using triangulation with an optical skid to remove vibration error. It showed effectiveness against vibration. When the skid probe diameter is not much larger than the wavelength of the profile, the amplitude of the measured profile is smaller than the actual amplitude. This report presents reconstruction method for use with the profile surface of a workpiece with the optical skid sensor and describes effects obtained by simulations and experiments using reconstruction method. View full abstract»

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  • Low-voltage driven method of ferroelectric memory device using optical polarization property

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (525 KB) |  | HTML iconHTML  

    We propose low-voltage driven method of ferroelectric memory device by using optical polarization measurement for detecting slightly difference of the polarized state as the difference in fast axis of birefringence. Non-volatile ferroelectric memory has a necessity to apply a voltage higher than coercive electric field for inverting spontaneous polarizations. Furthermore, repeated operation of these memory devices causes fatigue of ferroelectric ceramics due to the strain of a crystal structure which arise from the changing an electric polarization. For confirming the amount of memory effect as a function of the applied electric field, the hysteresis curve in the optical polarization property of PLZT (Lead Lanthanum Zirconate Titanate) has been measured. The coercive electric field Ec and Emax which is an electric field to align directions of all electric polarizations of a sample PLZT-8.9/65/35 are 14 and 3 kV/cm, respectively. Azimuth angle exhibited the amount of memory effect of 5.4° at the maximum electric field 4.5 kV/cm. In addition, in the range from 0 kV/cm to 3.0 kV/cm, the amount of memory effect becomes small values less than 1°. These results mean to allow us to use the memory effect in a driving electric field less than Emax by using the optical polarization property. View full abstract»

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  • Face recognition algorithm using wavelet decomposition and Support Vector Machines

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB) |  | HTML iconHTML  

    Face recognition algorithm is a very promising technique in biometric authentication. However, the recognition precision can be affected by many factors, such as feature extraction method and classifier selection. In this paper, a novel algorithm for face recognition is presented according to the advances of the wavelet decomposition technique and the Support Vector Machines (SVM) model. The extracted features from human images by wavelet decomposition are less sensitive to facial expression variation. As a classifier, SVM provides high generation performance without transcendental knowledge. First, we detect the face region using an improved AdaBoost algorithm. Second, we extract the appropriate features of the face by wavelet decomposition, and compose the face feature vectors as input to SVM. Third, we train the SVM model by the face feature vectors, and then use the trained SVM model to classify the human face. In the training process, three different kernel functions are adopted: Radial basis function, Polynomial and Linear kernel function. Finally, we present a face recognition system that can achieve high recognition precision and fast recognition speed in practice. Experimental results indicate that the proposed method can achieve recognition precision of 96.78 percent based on 96 persons in Ren-FEdb database that is higher than other approaches. View full abstract»

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  • Modular family of sensors for a Nanopositioning and Manomeasuring Machine

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1627 KB) |  | HTML iconHTML  

    This paper presents a modular sensor family and her integration into a Nanopositioning and Nanomeasuring Machine (NPM Machine). More and more flexible data acquisition is necessary in high-precision metrology of micro- and nanostructured parts with increasing complexity and 3D-dimensionality of the geometry. Sensing of most various surfaces and structures with nanometre resolution is an important issue. Because of different capabilities of divers optical probes among each other, but also of tactile and atomic force sensors a multiple sensor concept on the basis of a modular family of sensors is proposed. The combination of the several probes is realised by a microscope revolver system. Centrepiece of the metrology system is a Nanopositioning and Nanomeasuring Machine with sub-nanometre resolution in a measuring range of several milimetres. View full abstract»

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  • Three-dimensional imaging system by using a liquid crystal lens

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1607 KB) |  | HTML iconHTML  

    The microscope system in combination with a digital image processing is developed for determining all-focused images and depth mapping properties of microscopic objects by using a liquid crystal (LC) lens with variable focal length. Three-dimensional distributions of the microscopic objects are determined by applying voltages to the electrodes of the LC lens and tuning a focal plane in a depth direction. View full abstract»

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  • Design and first experiments on MagPieR, the magnetic microrobot

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2009 KB) |  | HTML iconHTML  

    This article deals with the design, the actuation and the control of magnetic microrobots. The interest in such microscale robots actuated by remote force fields is increasing since a large range of application fields could benefit from these small size manipulators. However major scientific challenges such as the optimization of the actuation platform, or the reduction of the adhesion between the robot and the substrate must still be overcome to perform complex micromanipulations. This article presents an example of a magnetic microrobot, MagPieR. Its design, fabrication, actuation and control are detailed. First experiments are presented, and the issues that must still be overcome are highlighted. View full abstract»

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  • Open loop control of dielectrophoresis non contact manipulation

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB) |  | HTML iconHTML  

    The framework of this paper is the study of “No Weight Robots-NWR” that use non-contact transmission of movement (e.g. dielectrophoresis) to manipulate micro-objects enabling significant throughput (1Hz). Dielectrophoresis (DEP) is currently used to separate, manipulate and detect micro particles in several domains with high speed and precision, such as in biological cell or Carbon Nano-Tubes (CNTs) manipulations. A dielectrophoresis system can also be considered as a robotic system whose inputs are the voltages of the electrodes and output is the object trajectory. This “No Weight Robots” enables the positionning of the manipulted object in a 3D space. This paper is summarized the modeling principle of this new type of robots and some first results on trajectory control in 2D space. View full abstract»

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  • Flexible and miniaturized microscope for three dimensionnal measurements

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (203 KB) |  | HTML iconHTML  

    In three dimensional measurement systems, two properties are generally difficult to maximize simultaneously: compactness and measurement accuracy. Compactness can be obtained with miniaturized opto-electronic devices such as small cameras. However, quality (resolution, frame-rate, signal to noise ratio...) of these small devices is lower than standard sized ones. In this paper an alternative configuration is described where the opto-electronic devices are not miniaturized but optically connected to small probes through image guides. Instrumental description of this system is detailed and a measurement result is finally presented. View full abstract»

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  • Grating-based fiber bending sensors with wide bending range

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    Simulation results based on a comprehensive model show that the amount of mode splitting in typical long period fiber grating (LPFG)-based bending sensor rises linearly in small range of bending. According to simulation results, this range of sensing in a typical LPFG-based bending sensor reaches to almost 5m-1. On the other hand, fiber Bragg grating (FBG)-based bending sensor behaves linearly in the wide considered range of bending, K=0-26m-1. View full abstract»

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  • High speed Tilted white-light Scanning Interferometry system for package bumps inspection

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1193 KB) |  | HTML iconHTML  

    Tilted white-light Scanning Interferometry(TSI) is oriented from Vertical Scanning white-light interferometry(VSI). TSI is optimized for lateral scanning; it's possible that scanning object with only one axis movement while VSI have to move more than two axis to scan a object lager than its Field Of View(FOV). This paper introduces implemented system for package bumps scanning using TSI with our own developed high speed camera. View full abstract»

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  • Viscosity measurement using fiber bend loss sensor

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (594 KB) |  | HTML iconHTML  

    A fluid viscosity sensor using bend loss theory is presented. The sensing principle makes use of the damping characteristic of a vibrating optical fiber probe with fix-free end configuration. By measuring the frequency response of the fiber probe, the viscosity can be determined from the displacement of the fiber. The physical and mathematical model of the vibrating fiber submerged in a viscous fluid has been put forward. The impact of the viscosity and density on the resonance frequency shift has been elucidated. Based on the solution of the model methods of the viscosity extraction from maximum vibrational amplitude and bandwidth have been proposed. View full abstract»

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