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To test this proposition, this experiment manipulated the pilot's effective field of view and examined subsequent flight performance, which was measured primarily by runway alignment error and vertical track error. Wide field of view alternatives promise to increase transfer of training effectiveness through enhanced situation awareness. However, current head-worn systems provide limited effective fields of view. The experiments demonstrated that the polishing removal rate was greatly improved.įor flight training, head-worn displays represent low-cost, wide field of regard, deployable systems when compared to traditional simulation facilities. Through theoretical analysis and experimental tests, the influences of the contact pressure, feed rate, and vibrational parameters on the material removal rate of the proposed polishing process were revealed. To solve the above-mentioned vibration coupling problem, herein we develop a novel two-dimensional ultrasonically actuated polishing process using two mutually perpendicular Lange in vibrators. However, in the existing two-axis vibration assisted polishing process, vibrational coupling occurs between the traverse and axial directions in the vibrating body and causes the actuating polishing tool to rotate, which limits the polishing effect. Among the valuable non-traditional finishing processes for generating super-smooth freeform surfaces that have been developed, the two-axis vibration assisted polishing process has attracted great attention from some scholars in recent years. The chapter will conclude with a brief discussion of some of the current research that may affect the solution that the market selects, including freeform optical surfaces.Ĭomponents with super-smooth freeform surfaces are being applied more and more extensively in various fields.
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Following the presentation of see-through HWDs, two differentiated solutions will be presented: the head-mounted (worn) projection display (HMPD) and the retinal scanning display (RSD), along with a brief overview of waveguided HWDs. Next, the Lagrange invariant (LI), which sets fundamental limits in the optical design of HWDs, will be examined. Particular emphasis will be placed on differentiating the concept of an eye pupil and an operational eyebox. Specifically, building on fundamentals of optical design, the key engineering concepts and constraints will be presented and solutions discussed. We will then review optical architectures for see-through HWDs along with key factors and functions required of a successful see-through HWD. Market barriers to the emergence of eyewear-format HWDs will then be highlighted. This chapter will first motivate the potential benefits of HWDs, especially in see-through mode, and examine key technology pathways that build on historical highlights. The system must be low cost (hundreds of dollars to the consumer) and approach an eyeglass format with resolution that approaches that of the human visual system extending into the peripheral FOV. The current industry goal is to supply a system that will receive widespread consumer acceptance (meaning millions of units need to be manufactured in a period of months once a design for manufacture point is selected). The first HD-format (1920 x 1080) OLED displays have been commercially available for over a year and have opened new doors for HWD applications. The last decade has seen a game-changing technology emerge, the organic light-emitting display (OLED), replacing what was thought to be a game changer, the light-emitting diode (LED) illuminator combined with a liquid crystal display (LCD) or liquid crystal on silicon (LCoS) display, which, in turn, had replaced the initial technology, the mini-CRT. See-through HWD design inherently requires an interdisciplinary approach optical engineering, opto-mechanics, ergonomics, and psychology are all keys to the design process. The result is a renewed research interest in a family of see-through head-worn displays (HWDs) enabling real-time interaction throughout the global community. Suddenly now, social media has burst on the scene and wireless access has become ubiquitous. When the initial solutions – a generation of look-at displays resting on the nose bridge – appeared around 2000, the market did not embrace it. Initially, the emphasis was on the individual experience, so the technology, which did not pursue a see-through geometry, seemed viable. Over the past three decades, as computer and display technology advanced along the path laid out by Moore’s law of miniaturization and functionality, many writers presented scenarios for augmented reality (AR) displays centered on bringing information to the individual.