This study investigates the optimization of solar thermal energy systems through MATLAB simulations, focusing on critical parameters such as concentration ratio, optical efficiency, heat transfer, energy storage, and ...
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This research proposes an optical wireless power transmission (OWPT) system utilizing light-emitting diodes (LED) to enable real-time automatic charging for mobile devices. The system features a high-power, high-effic...
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This research proposes an optical wireless power transmission (OWPT) system utilizing light-emitting diodes (LED) to enable real-time automatic charging for mobile devices. The system features a high-power, high-efficiency optical transmission design, incorporating a dual-axis beam-steering mechanism to maintain precise alignment with moving receivers in free space. By integrating machine vision and predictive control algorithms, the system ensures accurate tracking and stable power delivery under dynamic operating conditions. Simulation results show a large-scale power charging range. Experimental results demonstrate an output of up to 0.8 W from a 40 cm(2) GaAs photovoltaic receiver at a 1 m distance. Additionally, the system supports the uninterrupted operation of low-power devices moving at speeds of up to 30 cm/s within a 4 m range. Validated through simulations and experiments, the system showcases its potential of automatic OWPT technology. It offers a reliable and efficient power solution for application scenarios such as smart homes and factories, eliminating the constraints associated with batteries or physical cables.
Freeform surfaces have been used to achieve high imaging performance in recent years. Apart from the nominal performance, sensitivity is a vital factor for the realizability of the as-built performance. We found that ...
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Freeform surfaces have been used to achieve high imaging performance in recent years. Apart from the nominal performance, sensitivity is a vital factor for the realizability of the as-built performance. We found that freeform surfaces are not only excellent for aberration correction but also enable the achievement of desensitization. In this paper, two merit functions, FDS and SDS, are established, and a desensitization design method that performs desensitization modulation by using freeform surfaces (DMF), is proposed. This method elucidates the reasons behind freeform surfaces enabling low sensitivity and taps into the desensitizing potential of freeform surfaces. We used the Tianwen-1 High-Resolution Imaging Camera (HiRIC) optical system as the prototype and achieved a 42.14 % reduction in sensitivity by using the DMF design method we proposed.
Quantum dots (QDs), which are commonly considered semiconductor nanoparticles with a size of <10 nm, have recently emerged as an intriguing field in materials science due to their unique size-dependent optical and ...
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Quantum dots (QDs), which are commonly considered semiconductor nanoparticles with a size of <10 nm, have recently emerged as an intriguing field in materials science due to their unique size-dependent optical and electronic properties, chemical stability, and considerable potential for a wide range of applications. To date, new strategies and technologies are being developed for the application of QDs as optical sensors for measuring toxic metal ions in the aquatic environment owing to their properties of high sensitivity, low preparation cost, and portability. In this review, we discuss recent scientific developments based on the optical sensing of metal ions in the aquatic environment by QDs, especially focusing on II-vi group semiconductor QDs and carbon-based QDs. This review is subdivided into sections focusing on the various types of detection mechanisms, which are primarily based on the quenching or enhancement of the fluorescence of QDs. Furthermore, design strategies, such as quenching by direct analyte attachment to QDs, imperfections on the QD surface, and interruption in fluorescence resonance energy transfer (FRET) in the presence of analyte, are discussed. To provide insights into recent progress on QD (II-vi group QDs and carbon QDs)-based optical sensing, we compiled two comprehensive tables comparing QDs and their detection mechanisms and detection range. Finally, we discuss the future prospective of the present sensing strategies.
optical devices are an undeniable part of the next generation of information technology. One of the main optical devices required in all structures and systems is an optical waveguide, which is responsible for directi...
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We present a new approach for the tolerancing of correlated opticalsystems. These systems consist of at least two optical channels, which are linked together. To represent the correlations e.g., for compensators corr...
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ISBN:
(纸本)9781510673571;9781510673564
We present a new approach for the tolerancing of correlated opticalsystems. These systems consist of at least two optical channels, which are linked together. To represent the correlations e.g., for compensators correctly in the tolerancing procedure, tabulated pseudo random numbers are used. This leads to efficient tolerancing and accurate results.
The optimization of weight and volume of each component of aircraft, including mechanical, electronics and opticalsystems is crucial aspect. The cockpit of aircraft is loaded with different opto-mechanical, opto-elec...
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The optimization of weight and volume of each component of aircraft, including mechanical, electronics and opticalsystems is crucial aspect. The cockpit of aircraft is loaded with different opto-mechanical, opto-electronics payloads such as head-up display (HUD), Head-Down Display (HDD) Multi-Function Display (MFD) etc. to assist the pilot. HUD is a critical payload of an aircraft which is designed using augmented reality and is being used since 4 decades. This HUDs realised with bulky opticalsystems having monochromatic cathode ray tubes (CRTs) of 543 nm wave length P-1, P-43, P-53 phosphors with a contrast ratio of 1.2:1 display source. CRT needs high power and specialized electronics to trace the synthetic display on CRT screen to the pilot. All this results in a lot of challenges w.r.t. weight, volume, and electromagnetic interference (EMI)/electromagnetic compatibility (EMC) management. Upgrading the display source by replacing of CRT with a compact Digital Micro-Mirror Device (DMD) is a potential solution for these challenges. However, maintaining the existing opto-mechanical parameter of the system is a challenging task. This paper proposed a design solution for optical components for compact and lightweight HUD. A non-imaging optics is designed for LED source with 543 nm wavelength to give uniform distribution of light, and imaging optics is designed for DMD of resolution of 750 x 750 pixels, pixel size 10 um with aspect ratio 1:1, of 543 nm wavelength projects an image of same size of CRT screen, with Modulation Transform Function (MTF) 0.6 at 5ln/mm, distortion around 5%. A prototype has been developed based on an optimized opto-mechanical design to fulfil the engineering requirements of the HUD.
This study investigates the propagation characteristics of four-petal Gaussian beams through Cassegrain opticalsystems. With the properties of this new type of beam, the problem of masking loss in the Cassegrain opti...
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This study investigates the propagation characteristics of four-petal Gaussian beams through Cassegrain opticalsystems. With the properties of this new type of beam, the problem of masking loss in the Cassegrain optical system can be well solved. Analytical expressions of the optical field for beams after propagating the optical system are derived, considering atmospheric turbulence effects and random jitter on coupling efficiency. Simulation tests explore various factors affecting transmission efficiency. Acceptable axial mounting error tolerance and significant efficiency drops beyond specific communication distances under different turbulence conditions (Cn2). Achieving over 80% coupling efficiency is feasible with specific lens parameters (f = 0.4 - 0.5 mm, receiving position after 4 km) using standardized lenses. This work offers a theoretical model for four-petal Gaussian beams, aiding optical communication design and application, with practical engineering implications.
A new method for glass substitution during the lens design has been developed. Exploring existing longitudinal aberration contributions, the new method uses sensitivity analysis to find optimal optical glass constants...
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ISBN:
(纸本)9781510673571;9781510673564
A new method for glass substitution during the lens design has been developed. Exploring existing longitudinal aberration contributions, the new method uses sensitivity analysis to find optimal optical glass constants (refractive index, Abbe number, and relative partial dispersion) for certain optical system elements. A case study introducing the glass substitution method to the optical system design is described. It is shown that the new approach provides step-by-step improvements in the optical system's longitudinal aberration correction. The current limitations of the method are also described.
Point spread function (PSF) engineering in an imaging system involves the introduction of additional optical components to efficiently encode object information. It typically relies on a well-established mapping relat...
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