Session Index

Despite advances in thermoelectric power generation, near-room-temperature waste heat recovery remains challenging due to minor temperature differences. In order to recover heat waste efficiently, this work utilizes daytime radiative cooling in combination with thermoelectric technology. Further, a hierarchical micro-nano h-BN/ZnO composite (MNHZC), with an outstanding daytime radiative cooling ability and moderate thermal conductivity, is designed. It has high thermoelectric power generation levels and enhanced thermoelectric power. Due to the device's attractive energy generation capability, it has great potential for recycling low-grade waste heat and harvesting environmental energy.

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We utilized a coarse wavelength division multiplexing technique over the integration of optical communication and fiber sensor systems. The optical communication and fiber sensor network combination is a cost-effective, flexible, simple structure, and better for both urban and rural areas. The experiment result proves that the proposed system achieves good performance to transmit both optical communication and sensing signals.

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The purpose of present study is to provide a design proposal for CubeSat scientific payload of auroral observation application. A visible band aurora imager is designed for capturing satellite-based dynamic auroral activity. According to the requirements of science and optical design, the aurora imager has a focal ration of F/1.6, a field of view of 14° × 7° and a spatial resolution of 1.5 km/pixel. The lens dimensions compact close to 1U for the requirements of CubeSat. The materials and structure of lens are considered for long-lived in the space environment and during launching.


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Long exposure to blue enriched white light might damage eyes, which can be minimized by lowering the brightness and blue emission. There have been several approaches to reduce the potential blue hazards. We had investigated the eye protection effectiveness upon wearing anti-blue glasses under white light and using blue light-less candlelight OLED in text reading. We found that both approaches were effective with an eye protection index (EPI) of 16 for the former approach and 52 for the latter. The EPI can be enhanced from 16 to 50 as a color-conversion film was coupled under the white light desk lamp.

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Analyze lens refractive index, Abbe number and dispersion relationship, refractive index and temperature relationship, chemical properties, thermal properties, relative price, etc. Analysis of the imaging quality of the lens and the manufacturing and assembly tolerances of each lens.

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Previous paper introduced the robotic arm equipped with a new tool to polish optics. In this paper, the technology focused on numerical modeling. Experimental measurements show a sweeping ‘W’ path over the workpiece and the results have been used for predicting the material removal of a linear tool path.

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In this work, we use a non-contact optical and fast method to detect the surface topography of free-form lens and aspheric lens, we build up an interferometer by using penetrating/reflecting optical interferometric technology to detect the lens, and compare the simulation results with each other. It is hoped to achieve real-time detection and further develop a non-contact detection system for monitoring the quality of free-form lens.

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A simple molecular design strategy is proposed to provide three highly efficient Ir(III) phosphorescent emitters based on 2-phenylpyridine (ppy)-type ligands. The ppy ligands are modified with electron-withdrawing functional groups, resulting in tunable emission colors. As a result, we observed that our proposed device with electroluminescence emission wavelengths of the devices can determine in the range of 544 nm to 625 nm.

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A new designed totally internal reflection (TIR) lens with 50W white light LED is proposed to serve as the counter beam light (CBL) for the road lighting in tunnels. By means of optics design software SPEOS to process the TIR lens optimization, it is demonstrated that the optimized LED light can act as a qualified CBL to accomplish CIE 88:2004 regulated tunnel lighting through LiteStar software.

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Modern in the security, surveillance, and national defense markets, long-range infrared (IR) imaging plays an increasingly important role in monitoring, tracking, and targeting, the worldwide market for IR systems for commercial and dual-use security and surveillance applications are estimated to grow in the word.

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A surface profilometry measurement system was built along with a co-axial scanning colorimetric thermal imaging system which were both integrated to a powder bed laser selective melting (SLM) system. The automation of the two systems that may achieve on-line profilometry and thermal imaging were designed and implemented. Basic electronic and optical test were conducted, showing precisely the designed electronic signal flow and preliminary results. Further experiments are planned to validate the automated profilometry and thermal imaging during the SLM fabrication.

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This paper uses LightTools software as illumination simulation tools to design a light emitting diode (LED) lighting diffuser with various micro lens arrays. The optical model of refractive optical elements (ROE) for color homogeneity is built. The beam shapes of single and double sided micro lens arrays with circular and hexagonal lenslets are simulated and analyzed in the far field. The double sided micro lens arrays with non-periodic lenslets are employed as microstructures for the diffuser and optimized their placement. The paper provides the possibility of achieving color mixing for the design of a LED diffuser and general lighting.

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In this paper, the Intel RealSense D455 depth camera is used to shoot six different object moving directions and calculate the average speed of the object and the image, and then use the measured average speed of the object and the calculated average speed of the object to calculate the amount of error between the two and analyze the cause of the error. The errors of the average speed of the final six experiments are all less than 6%。

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Intravenous injection is a common demand in hospitals. In recent years, the clinical care work of medical staff becomes more and more burdensome. This work is connected with Wi-Fi, remote monitoring platform and cloud database to reduce the workload of nurses and their families. Nurses and their families can know for the first time that the drip in the infusion kit titration room has been completed, thus reducing the burden on the medical staff. At the end of intravenous injection, the needle was removed immediately to reduce discomfort and damage to the intravenous injection site.

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In this study, a low f-number, wide-angle capsule endoscope lens based on an aspheric lens is proposed, which has a field of view (FOV) of 130°, an F-number of 2.0, and a modulation transfer function(MTF) of more than 0.3 at a spatial frequency of 178 lp/mm, and the optical distortion ≦ 30%. To sum up, the proposed lens system can obtain excellent image quality.

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In this work, a single-axis galvanometer scanner using two galvanometers is proposed as a new approach to laser micromachining technology. The additional second galvanometer is used to manipulate the output laser beam of the first galvanometer to enhance the telecentric error correction and improve the beam quality to meet international standard ISO 11145:2018.

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To keep the unmanned ground vehicle (UGV) following the predetermined path in specific agricultural field environment and coping with the uncertainty of the surroundings, path following and obstacle avoidance are the capabilities that is needed. In this study, we combine model predictive control with deep deterministic policy gradient to ensure UGV tracking on the reference path, meanwhile achieved collision avoidance by generating a new local path through several previous deep reinforcement training when observing the obstacle during the dynamic process.

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This research combined a depth measuring sensor Kinect v2 with a pneumatic muscle body-weight support system to reduce the rehabilitation system cost. The Kinect v2 was adopted for capturing the coordinates of human bodies, and required gait parameters after calculated. Then, a training method that required participants to project their footprints was proposed. To verify the reality and functionally of the system, the effects of gaits under natural walking, footprint guidance, and body-weight support system on gait with or without feedback control were compared. The results demonstrated that the system could provide better stability and symmetry of gaits for participants.

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Quartz has many remarkable characteristics such as piezoelectricity nature, high frequency. Quartz has been used in micro-sensors and MEMS applications, Comparing dry and wet etching techniques of quartz, the cost of dry etching has more preferable profile control but is much more expensive than the wet etching. To fabricate the structures, chromium and gold thin film is evaporated on the AT-CUT quartz substrate and patterned as etching masks. The sample is then etched in ammonium fluoride solution of saturated concentration and BOE solution at 45℃ respectively. The etched profiles are observed using SEM to establish etching rate in AT-cut quartz.

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Heartbeat varies throughout the day, which is strongly affected by the ambient light. After dusk, it should slow down gradually and significantly, provided there is no artificial light interference. However, reading at night has almost become a routine for students. Little was known about the effect of lighting with or without blue emission on heartbeat after dusk. We had hence performed a preliminary study to investigate the same and found that the heartbeat could be reduced by 20% from 6 to 9 p.m. as a blue light-less candlelight OLED was used, while only 10% under a white light.

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Black-board is a typical teaching aid facilitating lessons giving in schools. Viewing clarity should however be ensured always, otherwise eye fatigue might easily occur. Black-board with a green color was thought to be more friendly than the typical ‘black’-board. We found that ‘black’-board had actually provided better viewing clarity. Taking subjects sitting at 9m away for example, recognizable font-size was 49pt for black-board, while 75pt for green-board under a 240 lx reaching-eye illuminance, showing the ‘black’-board to have a 53% better viewing clarity.

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In this study, we discuss the slot antenna array fed by microstrip-line with liquid crystal phase shifter operating at 60GHz. We observed the far-field radiation beam can be swept for 11 degrees and can be further increased by using the meander delay line.

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In order to reduce the risks and accidents in life, the development of sensors is extremely important. Compared with traditional electronic sensors, fiber-optic sensing is relatively small in size and has high accuracy. In this paper, Fiber Bragg Grating (FBG) sensor based on the Fabry-Perot (FP) Filter technique is proposed and experimentally demonstrated, which increases the feasibility and is highly efficient in the optical system. Moreover, a deep learning technique is proposed to increase the correctness of estimating the sensing signal of the FBG sensor system.

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Bright sunlight might damage eyes. Long exposure to blue light enriched backlight of 3C products might also impose threats. To protect, wearing photochromic lens has become an option. However, none had been reported about their eye protection effectiveness (EPI). We had found that the EPIs ranged between 2 to 6 for a series of photochromic lenses upon exposing to a 17,000lx daylight. They showed no protection effectiveness, indoors, in filtering the screen blue light. In contrast, an orange lens counterpart showed a 30 EPI under the same daylight and a 27 EPI in computer blue light screening.

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We demonstrate electrically tunable twisted nematic (TN) aligned liquid crystal (LC) Terahertz Quarter-Wave Plate (THz-QWP) and Full-Wave Plate (FWP) with a novel structure, in which a single LC composite polymer thin film is inserted in the middle of the LC cell. Using this design, the phase shift has been increased by 14.3° at 1.2 THz in comparison to the conventional design (98.1°). The threshold voltage has been lowered from 0.81V to 0.48V while the driving voltage for QWP operation has been reduced from 8.4V to 6.3V at 1.2 THz.

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A practical algorithm based on numerical analysis technique was proposed for modeling the optical spectra with heavy noises from photo detectors to extract useful information. Our preliminary result indicated that the exact timing as the light-emitting device initially turned on can be mathematically determined from our algorithm.

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According to the consumer market demand for air purification, let us know that there is an urgent need for the miniaturization of the Photocatalytic air purification system in the current market. Therefore, we have designed and developed a set of miniature Photocatalytic modules, which are not only small in size but can be used in series. Furthermore, it can evenly irradiate the spherical particles coated with titanium dioxide, and efficiently filter formaldehyde in the air through the Photocatalytic reaction.

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In order to meet the long eye relief requirement of ocular optical system, a type of eyepieces with long exit pupil distance were designed. The system parameters of the eyepieces designed for 0.5 inch OLED micro display were under the premise that the diameter of 8 mm exit pupil, 32 mm exit pupil distance, the focal length 23.89 mm and 30° field of view (FOV) was realized. The results show that MTF of eyepieces are higher than 0.3 for all fields of view at the frequency of 35lp/mm and the distortion of all fields are low than 0.5%.

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The group delay dispersion (GDD) would disturb the pulse width of the ultrafast laser and affects the laser power concentration. The GDD induced in optical system might vary dynamically when the temperature or optics are changed. In order to compensate the dynamic dispersion change. A linear deformable mirror-based pulse compressor is developed to compensate the dispersion in real time. With the FPGA-based digital PI (proportional-integral) controller, the GDD compensation can be improved to 100 Hz control loop and the GDD can be converged in 5 time steps.

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The study used special lamps with different structures to generate concentrated light patterns of LED lamps of different wavelengths to disinfect the soil. Moreover, the simplification of the sterilization framework in the past is environmentally friendly and efficient, which is conducive to farmers' large-scale commercial purchase and use.

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Multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters have several advantages, such as high quantum yields, narrow emission profiles, and deep blue emission. We optimized the electroluminescence performance of the MR-TADF emitter by using an exciplex co-host emissive layer configuration. As a result, the optimal device can achieve a maximum external quantum efficiency (EQE) of 20.60 % and a luminance of ~ 10370 cd m-2 at 8V.

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By designing the light pattern into three obvious bright spots and reduce the connection area between the reflector segments, the designed headlamp can meet K-mark regulation with an extreme-high contrast.By designing the light pattern into three obvious bright spots and reduce the connection area between the reflector segments, the designed headlamp can meet K-mark regulation with an extreme-high contrast.

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