Session Index

Long exposure to blue-enriched screen backlight might damage eyes. Currently, no study discloses the effect of screen blue-emission backlight on eye strain. We hence attempted herein using blink rate to reflect the eye strain during film watching. The average blinking rate was 16 times per minute after watching the film for 90 minutes. It decreased to 12 as an effective anti-blue light orange glasses was equipped. Subjects with a high myopic diopter tended to blink more frequently; i.e. the blink rate increased from 14 to 24 as the diopter (-D) increased from 0 to 8.

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A 16x sniper scope with a 40mm objective diameter is proposed. Systems are optimized for aberrations, distortion, and chromatic issues. Tolerance analysis is conducted to ensure that the design is suitable for mass production.

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We report the progress of developing a surface profilometry measurement system integrated in a powder bed laser selective melting (SLM) facility. The image capturing hardware, distortion correction and surface profile demodulation procedure were integrated to achieve automatic motionless wide-field on-line profilometry. Automatic defect identification and categorization on powder bed and solidified surface are planed.

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With the support of National Science and Technology Council (NSTC), we are developing an optical testing system for near-eye displays (NED). This paper discuss a custom designed objective lens which is a function of effective model of human eye, captures the virtual image from the NED, delivers the required optical information for the NED testing system to evaluate the NEDs performance by emulating the human eye.

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High power LED or fiber laser require collimated light for higher accuracy. We use optical principles and optical software to calculate and simulate collimated lenses and optimize them. The study is divided into two modules: Module A is a plano-convex lens with a flat surface close to the light source and Module B is a plano-convex lens with a convex surface close to the light source. It is found that Module B is more suitable to be used in the case where the light with a full angle of 15° after passing through the lens. Its alignment is 0.956°.

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In an optical microscopy system, remote focusing (RF) is achieved by adjusting the defocus term of Zernike polynomials. With a model-based adaptive optics (AO) system, we achieve both remote focusing and effective aberration compensation. In this study, the AO system employs a mathematical model based on 15 Zernike polynomials, with a Shack-Hartmann wavefront sensor (SHWS) and a deformable mirror (DM) as the sensor and wavefront corrector, respectively. Combining CameraLink high speed with the real-time computational capabilities of a field-programmable gate array (FPGA), the system achieves a 200 Hz aberration correction rate.

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Taiwan's geographical relationship in security, surveillance, and defense markets, long-range infrared (IR) imaging is playing an increasing role in surveillance, tracking, and targeting [1], so this paper design a compact IR camera with 5x optical zoom.

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The rapid growth of data-intensive applications has driven the demand for high-speed chip-to-module (C2M) channels. This study investigates the feasibility of operating a C2M channel at 212 Gbps. We focus on mitigating inter-symbol interference (ISI) and enhancing performance through the implementation of floating taps decision feedback equalization (DFE). By evaluating factors such as intrinsic noise and precise ISI correction, we aim to achieve reliable data transmission and compliance with standards. Our findings provide insights into the essential considerations for achieving efficient communication in high-speed C2M channels.

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This report develops a novel spectrometer with high-resolution and wide spectral bands. It is only necessary to quickly control the switch of the plane reflector through the linkage mechanism, and provide the user with fast switching between various spectrum bands, which not only enables the spectrometer to have high resolution, but also enables rapid detection of different spectrum bands. Compared with traditional spectrometers, the developed spectrometer does not require an expensive and precise grating rotation mechanism to expand measured range of spectral bands.

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In this paper, the combination of a tunable Mach-Zehnder Interferometer (TMI) and a fiber Bragg grating (FBG) sensor is utilized to measure vibrations. By adjusting the free spectral range (FSR) of the TMI, the amplitude of the measured vibration can be changed.

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In this paper, a novel bidirectional communication system is presented that combines optical communication and sensor networks with a hybrid of fiber and free space optical communication (FSO) transmission channels. A coarse wavelength division multiplexing (CWDM) multiplexer/demultiplexer is utilized to allow for the simultaneous transmission of optical communication signals and sensor signals.

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Lens manufacturing assembly tolerance is a necessary issue for every lens optical factory, but its processing cost and optical imaging quality vary greatly from one optical factory to another with different technologies. This paper analyzes the differences of glass lenses at different temperatures and the influence of lens manufacturing and lens assembly tolerances on the image quality of the lenses.

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This study analyzes the relationship between glass refractive index, Abbé number, and dispersion, and uses the principle of image plane displacement of flat glass to improve and enhance the resolving ability of the telecentric lens when focusing at different heights.

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A device designed to use six LEDs in combination with vehicle motion sensors and the Local Interconnect Network (LIN) Bus protocol is proposed to improve the blind spot encountered by motorcycles when entering curves, using the PCB design software Altium Designer 17 for circuit design, and complying with ECE Regulation R10 for electromagnetic compatibility.

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This research uses light-stimulated plant growth technology to achieve the goal of strengthening the photosynthesis of sea weed in the ocean to purify the marine ecology, and then contribute to social, economic, and academic development. By utilizing LED lighting technology, the production efficiency and quality of seaweed can be improved, thereby increasing the production of seaweed. In addition, using this technology to cultivate seaweed can also reduce the impact on the environment, such as reducing greenhouse gases. In addition, due to the higher energy efficiency of LED lighting technology, it can also reduce the energy cost of seaweed production.

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Long exposure to blue-enriched white light might harm eyes and health. To mitigate, night-light mode has been introduced in computer operating systems. However, no research has reported its effectiveness in eye protection. We hence carried out a study regarding how its affected permissible viewing time and clarity. We found that higher night-light-setting strength led to lower screen brightness and lesser blue emission, permitting a longer viewing time and better clarity. Taking 100%, for example, it permitted 67 h viewing time with a required 3 lx to view clearly 7-pt text, while 4.4 h at the default setting with 7 lx.

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Long exposure to blue-enriched screen backlight or sunlight may cause eye diseases. Anti-blue light contact lenses have been introduced as a protective measure. However, no research has been conducted regarding their eye-protection effectiveness. Therefore, we carried out a quantitative study using a blue hazard quantification spectrometer. All colorless contact lenses investigated barely showed protection effectiveness. If tinted, a yellow one showed a high EPI of 1.5 in front of a computer screen or 1.3 under sunlight. The control part, an orange lens, exhibited an EPI of 20 indoor and 24 outdoors. We suggest reconsidering antiblue light measures for eye safeguarding.

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Projection teaching is one of the teaching methods, while indoor illumination is needed for note-taking. The concern is whether this additional illumination would burden eyes. We hence investigated the effect of classroom illumination on projection viewing time. Without illumination, the permissible time was 1.1 h at 2 m, while 1 under yellowish-orange light and 0.4 under white light. It increased drastically by changing the display setting from the black text on white background to an orange text on black background. Without illumination, it was extended by 42 h, while by 3.8 under yellowish-orange light and 0.7 under white light.

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Long exposure to short-wavelength emission-containing sunlight and computer backlight might be harmful to eyes. To prevent, sunglasses is a popular option. However, no research discloses what color can provide the best protection without compromising viewing clarity. We hence performed a quantitative study for the same. We found that the typical gray one shows an eye protection index (EPI) of 17, outdoors, but with a poorest relative viewing clarity (RVC) of 77%. In contrast, an orange one shows an EPI of 9, but with a highest RVC (97%).

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This paper presents an optical design for tunnel lighting that incorporates a freeform secondary lens capable of accommodating counter-beam, pro-beam and symmetric lighting patterns. This design is adaptable to surrounding conditions, thereby ensuring both driving safety within the tunnel and energy efficiency. Through this approach, the safety of tunnel navigation is assured while simultaneously achieving significant energy savings.

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The high-frequency passed spectra of metal-wire-woven hole arrays (MWW-HAs) are presented in the frequency range of 0.1–2 terahertz (THz) and compared with those planar metal-hole-arrays (MHAs) that were perforated on various thicknesses of metal slabs. The high-frequency-passed spectra have transmittance peaks in high frequency ranges but very closing to the cut-off frequencies. The spectral peak transmittance of MWW-HAs are relatively higher that that of MHAs due to the characters of low THz resistance and polarization maintenance. The periodically corrugated metal woven wires of MWW-HAs can split the spectral transmittance peaks, performing one new THz plasmonic metamaterial.

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To optimize a spatial light modulator (SLM) for phase modulation of lasers, start by calibrating its phase range and linearity. This ensures that the modulated intensity of calibration system corresponding to the SLM phase pattern ideally follows a period of cosine curve. After calibration, computer generated holography (CGH) technique is adopted to convert Gaussian beam intensity profile to a flat-top beam by phase modulation. This altered profile diffracts upon entering the optical system, achieving desired performance.

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We propose a novel heterodyne light source with two acousto-optic modulators (AOMs) and a half-wave plate. This architecture differs from the conventional Mach-Zehnder setup and can simplify the optical system structure for enhancing the precision and stability of the heterodyne interferometer.

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We introduce an inverse identification and design approach for optical waveguide analysis, tailored to specific mode or target intensity distributions. Using the finite difference method, we discretize the Helmholtz equation, reinforcing its role among mode solvers. From this foundation, we formulate a cost function and a unique gradient related to the waveguide's refractive index. Utilizing the Adam algorithm for cost function optimization, we highlight its superior efficiency in bypassing local minima, ensuring swift convergence, and eliminating the necessity for preset refractive index boundaries.

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In this study, we combined polarization microscopy system with color polarization camera to complete the setup of a multi-wavelength dynamic interferometer. However, the color polarization camera exhibits optical errors in its mechanical structure, Therefore, the Super Pixel method will be used in the software to correct the distribution of pixels. Using this method to enhance the accuracy of phase measurement and reduce errors in measuring thin film samples.

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An intelligent waste segregation system for fixed and deformable-shaped waste objects was designed and implemented for the first time using an upgraded double convolutional neural network (CNN) model (based on MobileNet-based single-shot multibox detectors (SSD) + MobileNet). The system's identification accuracy is higher than the conventional waste segregation design employing just a single MobileNet SSD or MobileNet network model, reaching 96.1%. Additionally, the system can still successfully recognize waste objects in settings with light levels ranging from 10 to 10,000 lux.

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