Taking the standard simply supported beam of the Xi’an Metro Line 10 as an example, numerical analysis models were established using Midas /Civil software for both ductile seismic-resistant systems and seismic isolat...
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This work shows that aspherical surfaces obtained by the general equation of stigmatic sequential opticalsystems are very sensitive to wavelength. The application these surfaces to broadband lens-based systems is lim...
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We present non-volatile memory (NVM) devices based on valley-spin hall effect (VSHE) in monolayer WSe2 and discuss how we utilize their unique properties for logic-memory integration in two applications: (i) compact a...
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The Laser Guide Star Facility (LGSF) system of the Thirty Meter Telescope (TMT) will generate up to 8 artificial laser guide stars in the mesospheric sodium layer with the brightness, beam quality, and asterism geomet...
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ISBN:
(纸本)9781510675186;9781510675179
The Laser Guide Star Facility (LGSF) system of the Thirty Meter Telescope (TMT) will generate up to 8 artificial laser guide stars in the mesospheric sodium layer with the brightness, beam quality, and asterism geometries as required by both the TMT first light AO system and future AO instruments. It includes the sodium lasers mounted on the telescope elevation structure below the primary mirror, the conventional beam transfer optics system to transport the beams up to the telescope top end, and the formatting and launching optics to project the required laser guide star asterism to the sky using a center launch telescope located behind the secondary mirror. In this paper, we will present the recent successful completion of the LGSF preliminary design, including: the optical, mechanical, electronics, safety, control, and software designs;the systemsengineering;the modeling activities;and the next steps for the system's final design phase including prototyping.
Tool wear monitoring (TWM) based on data-driven methods is essential to ensure product quality and overall efficiency. Machine learning (ML) models, unlike physics-based approaches, are practical for online monitoring...
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optical system design is undergoing a transformational change with the increases in computational horsepower, cutting-edge algorithmic developments, and the advent of new nanofabrication technologies. Among the most e...
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ISBN:
(纸本)9781510654198;9781510654181
optical system design is undergoing a transformational change with the increases in computational horsepower, cutting-edge algorithmic developments, and the advent of new nanofabrication technologies. Among the most exciting advances in recent memory are optical metasurfaces, which are patterned surfaces commonly realized through nanofabrication that can imbue optical engineers with expanded degrees of design freedom due to their ability to exploit the generalized form of Snell's law. Through intelligent optimization and design, metasurfaces can be constructed which achieve arbitrary chromatic dispersion behaviors and unprecedented control over polarization that simply cannot be realized with conventional optical elements. However, designing high-performance metasurfaces requires the use of full-wave simulation tools and numerical optimization techniques which necessitate considerable computational resources. Moreover, while optical metasurfaces are moving towards millimeter and centimeter scale diameter lenses with advances in nanofabrication techniques, it is computationally infeasible to employ full-wave simulation tools directly to model opticalsystems that use such large size elements. Nevertheless, the size, weight, and power (SWaP) advantages afforded by optical metasurfaces make them a compelling choice for designers to consider in a number of applications, which are currently limited by bulky conventional optical solutions. Therefore, techniques that can rapidly model metasurfaces in conjunction with conventional optical elements such as lenses, mirrors, and prisms are highly desirable. In this presentation, we highlight a toolkit of custom solvers, design procedures, and powerful optimization algorithms that simplify and accelerate the development of hybrid opticalsystems with arbitrary combinations of conventional and metasurface elements.
Capacity and distribution requirements in networks drive a need for more fibre in cable. However, the space available to provision additional fibre is constrained leading to higher density of fibre in cable. This pape...
With the rapid development of modern science and technology, control technology and theory have made great progress, the development of industrial automation is more and more rapid, the degree of automation is also hi...
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ISBN:
(纸本)9781510689251
With the rapid development of modern science and technology, control technology and theory have made great progress, the development of industrial automation is more and more rapid, the degree of automation is also higher and higher, and the scope of use has also been greatly expanded. Under the influence of the rapidly developing microcontroller technology, the technology covers many disciplines including sensor technology. This design is under the background of hardware selection and software design to realize the image recognition intelligent car system. The intelligent car system designed by the design can realize a variety of functions, including image recognition, Bluetooth remote control, voice broadcast, ultrasonic obstacle avoidance, speech recognition, autonomous tracking, gesture recognition, ultrasonic speed measurement, OLED screen display and other functions. The design of the camera on the OpenMV module are used to collect images, and identify and process them. If the target image is identified, send data to the microcontroller through the established serial port communication protocol, and the microcontroller performs the next *** car has added a LD3320 voice recognition module, which can distinguish the sound of people, and can control the car driving through the sound. The car can be remotely controlled through the HC-05 Bluetooth module, and each module can be selected through the *** the ATK-PAJ7620 gesture recognition module, the car can recognize our gestures and realize the corresponding functions. The TCRT5000L tracking sensor can detect the black track on the ground, and the ultrasonic HC-SR 04 sensor is added in the front position for distance detection. The module transmits the collected relevant data to the main control, so as to realize the autonomous tracking of the car and the function of of avoiding obstacles. Speed measurement can also be performed by the ultrasonic module, and the speed results can be display
Metalenses based on all-dielectric metasurfaces plays an important role in microscopic imaging, machine vision and holographic imaging. Chromatic aberration correction is an important factor that imaging devices. In t...
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An integral (ii) imaging method using quarter-overlapped microlens arrays (QOMLA) is proposed to improve the display performance. The principle and the simulation of POMLA is analyzed by geometric optics and wave opti...
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