Session Index

ABSTRACT:In this study, we propose a new counter beam light (CBL) capable of being equipped with 400W, 250W and 100W high pressured Sodium lamp respectively for CIE:88 2004 regulated tunnel road lighting design.
and the proposed light was simulated and its prototype was measured to get its beam pattern information to import into LiteStar 4D softwares for tunnel lighting analysis. The CBL fixture was designed as an optical reflector with three sectional curved finishing surfaces, which mission was to decrease optical glare and enhance object contrast, bringing more safety with drivers in tunnels than convention tunnel lights.

 

The proposed measurement based on total-internal reflection and the polarization interferometry can be used to measure the refractive index of lenses. By finding the relationship between the maximum phase difference and refractive index, the refractive index can be obtained. The system’s resolution is 1.6 × 10-3 RIU.

 

A rotation displacement measurement technique with high resolution for large range measurement is presented. The proposed technique is based on the birefringence effect and phase detection of polarization interferometry with a polarization camera. The experimental results show that the resolution can reach 0.003° with a 10° measurement range.

 

Design a group of two-lens system, and combine with the spatial light modulator (SLM), carry out the research of dynamic pattern enlargement and shrink. According to ynu ray tracing theory calculation, a pattern with 0.6~1.5 times of magnification can be obtained.



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An LED Counter Beam Light (CBL) with a free surface secondary lens is proposed to enhance the safety and efficiency of tunnels. The secondary lens was designed and produced to be mounted on a 50 W white-light LED array to generate the targeted counter beam pattern, in order to meet the standards for enhanced tunnel road lighting of the CIE (Commission Internationale de l’Eclairage)—CIE 88:2004—in a trial tunnel lighting scheme.

 

In a scanning system, a laser beam moves linearly in one or two dimensions by using a galvanometer or scan mirrors. When using traditional lenses, the profile of the focused beam changes as the beam moves away from the optical axis. In this paper, a F-Theta telecentric lens for wavelength 355 nm is studied to create a flat field and the resulted image height is linearly proportional to the focal length and the scanning angle theta. The rays on the image plane of the proposed lens are parallel to the optical axis.

 

A zoom beam expander is designed for being applied in multi-beam splitter. By shifting the convex lenses in the beam expander, the directions and the spot size of the split beams can be changed. In consequence, a multi-beam splitter can become adjustable for fitting to optical systems with different specifications.

 

Deep learning are widely applied for automatic defect inspection in textile industry due to its versatility. In this research, we developed a compact convolutional neural network (CNN) architecture to position the defect in pixelwise level (segmentation) as well as find the type of abnormalities (classification) on the fabric surface. Proposed model was demonstrated to achieve 93.75% defect accuracy and average 72.92% anomaly classification.

 

We propose a novel dual-field digital holographic microscopy (DFDHM) technique and its miniaturization design for industry needs in future. The proposed technique shows a low noise for reconstruction images. DFDHM has the advantage of switching between bright-field and dark-field DHMs without the use of special optical components, and prevent the risk of damaging the samples.

 

The performance of automotive industrial lighting can be customized to the required applications through 3D LED lighting technology, which is still evolving while reducing costs. Potential for the future lies in the emerging 3D LED lighting technology. Prism array, known light shaping diffuser (the LSD), is integrated into an automobile taillights to provide security and traffic visibility ahead.

 

In this research, a set of spectrally resolved white-light interferometry is constructed to find out the group-refractive-index of beam-splitter. The measured intensity of the white-light interference spectra is analyzed. The phase difference is unwrapped from the interference intensity. This phase difference can be calculated to obtain the group-refractive-index of it.

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This paper reports on the integration of a broadband light source with reflective optics
to enable white light confocal spectroscopy across a bandwidth of 400 nm to 1000 nm. All study
objectives were achieved, including the development of a scanning white light confocal
spectroscopy and the extraction of one- and two-dimensional spectral-imaging information from
single-point spectra via scanning. This paper focuses on the performance of the measurement
system used in the proposed spectroscopy, which comprises a graded reflectivity mirror.

 

The total market share of high-end eye protection product worth hundreds of billions, for instance, ski goggles which protect users from dust, snow and sun reflection usually cost NT$1000~NT$10000 a pair, but when defects occur during the production, it might cost severe safety issue resulting in danger. We proposed a novel defect detection framework based on image enhancement and deep learning, making the system efficient and precise, defect detection cost 5 sec for a single ski goggle sample with 100% accuracy and 5 sec for its defect recognition with a 96% accuracy.

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In research,light-driving bug zapper is presented for well controlling the diseases brought by insects, such as mosquitos. In order to have device efficient to trap the insect pests in off-grid areas, pulse width modulated light emitting diodes (PWM-LED) combined with an solar power module are proposed and implemented. With specific PWM electric signals to drive the LED,The ability of catching insects or power efficiency can be enhanced. It is demonstrated that 40% of the electrical energy can be saved and the trapped mosquitos are about 250% increased when the PWM method is applied in bug zapper experiments.

 

With a properly designed null CGH, the mirror corresponding to the CGH can be fabricated and tested. By simulating and gaining understanding about the errors, fabricators can make better informed judgement calls on where to tighten the fabrication process or if a process requires a complete revision.

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An optical system for measuring the depth distance of an object was proposed. This system can scan a region by obtaining the relationship curve between focus distance and motor step. The depth distance was acquired by determining whether the captured objects was in focus or not by discerning the sharpness of the object’s outline, with the motor step when the object was in focus. The optical path of the system was simple, and its volume was minimal.

 

This paper proposed an overlay measurement error calculation model caused by the pattern-center shift. Furthermore, the multiple-wavelength measurement methodology was used to verify that the overlay measurement error was linearly proportional to the pattern center shift. An asymmetric sidewall structure was set in the simulation showed a linear relationship between the overlay value of multiple-wavelength and the value of pattern center shift, and the R-square of the linear fitting curve was 0.9992.

 

In this paper, a flexibly compatible and wireless-based dynamic 3D acquisition and imaging for increasing mobility and scalability for many practical dynamic scenes in fringe projection profilometry is proposed. However, suffering from the spectrum overlapping and phase distortion artifacts for absolute phase retrieval, it generally yields a coarse phase map with low quality of depth ambiguity problems for dynamic 3D acquisition. We propose a deep learning framework for robust unambiguous depth measurement to ensure the stability of absolute retrieval phase in FPP. The practicality of the proposed deep-learning-based technology is verified by experiments without additional and compromising fringe modulation.

 

In this research, the wide-angle diffractive optical elements (DOEs) correct the distortion and intensity attenuation. The DOEs were designed using a combination method the Iterative Fourier Transform Algorithm (IFTA) with Stepwise quantization and the Large Error Reduction Algorithm (LERA) to optimize the diffraction image and output the phase diagram with the best image quality to make products. The wavelength light source actually illuminates the diffraction image and compares the simulation results and difference with the wafer structures and designed.

 

We demonstrate a 3D volumetric display system which utilizes two Fresnel Mirrors for displaying the 3D images at the exit aperture. The transverse and the longitudinal magnification were derived from the Fourier optics, and the imaging distance was confirmed by a MATLAB program for simulation of the optical dual-lens system.

 

We propose a digital-grating moiré technique for measuring the focal length of spherical lenses and mirrors. The feasibility of the method was experimentally demonstrated with percent errors less than 0.5%. The proposed method should have advantages of a simple setup, high stability, and high accuracy which has considerable potential in relevant application.