Topic
Night vision
About: Night vision is a research topic. Over the lifetime, 6004 publications have been published within this topic receiving 67372 citations.
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15 Jun 2021
TL;DR: In this paper, a nonlinear wave-mixing process was used to perform infrared imaging in a metasurface composed of GaAs semiconductor nanoantennas, and the upconversion of short-wave infrared wavelengths via the coherent parametric process of sum-frequency generation was shown.
Abstract: Infrared imaging is a crucial technique in a multitude of applications, including night vision, autonomous vehicle navigation, optical tomography, and food quality control. Conventional infrared imaging technologies, however, require the use of materials such as narrow bandgap semiconductors, which are sensitive to thermal noise and often require cryogenic cooling. We demonstrate a compact all-optical alternative to perform infrared imaging in a metasurface composed of GaAs semiconductor nanoantennas, using a nonlinear wave-mixing process. We experimentally show the upconversion of short-wave infrared wavelengths via the coherent parametric process of sum-frequency generation. In this process, an infrared image of a target is mixed inside the metasurface with a strong pump beam, translating the image from the infrared to the visible in a nanoscale ultrathin imaging device. Our results open up new opportunities for the development of compact infrared imaging devices with applications in infrared vision and life sciences.
42 citations
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11 Mar 2009
TL;DR: In this article, a headlamp is provided, which has lower power consumption, a longer service life and a more compact size and yet is capable of easily projecting visible light and near infrared light in desired light distribution patterns.
Abstract: A headlamp is provided, which has lower power consumption, a longer service life and a more compact size and yet is capable of easily projecting visible light and near infrared light in desired light distribution patterns. The headlamp includes a wavelength converting member and an excitation light source. The wavelength converting member includes a visible light fluorescent material which is excited by excitation light emitted from the excitation light source to emit visible light, and a near infrared fluorescent material which is excited by the excitation light emitted from the excitation light source to emit near infrared light. The visible light and the excitation light are mixed together to generate white light. The excitation light source is a semiconductor solid-state element.
42 citations
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15 Jan 2010
TL;DR: In this paper, a method and system for an inductively powering rail on a firearm to power accessories such as: telescopic sights, tactical sights, laser sighting modules, and night vision scopes is presented.
Abstract: A method and system for an inductively powering rail on a firearm to power accessories such as: telescopic sights, tactical sights, laser sighting modules, and night vision scopes. This is achieved by having primary and secondary electromagnets (U-Cores) on both the inductively powering rail and the accessory. Once the electromagnets are in contact, the accessory is able to obtain power through induction via the inductively powering rail. Accessories may be attached to various fixture points on the inductively powering rail and are detected by the firearm when attached and detached. When attached, power and data communications may flow between the accessory and a master CPU located on the firearm. Accessories that are attached to the inductively powering rail and have rechargeable power systems may be recharged via the inductive power rail. Further, accessories that have power that is not needed may be transferred to other accessories.
42 citations
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TL;DR: Overall, spectacle corrections (PAL and SV) performed well for distance driving tasks, but SV negatively affected viewing near dashboard targets.
Abstract: Purpose. To investigate the effect of various presbyopic vision corrections on night-time driving performance on a closed road driving circuit. Methods. Participants included 11 presbyopes (mean age: 57.3+/-5.8 years), with a mean best sphere distance refractive error of R+0.23+/-1.53 DS; L+0.20+/-1.50 DS, whose only experience of wearing presbyopic vision corrections was reading spectacles. The study involved a repeated measures design, where participant's night-time driving performance was assessed on a closed road circuit when wearing each of four power-matched vision corrections. These included single vision distance lenses (SV), progressive addition spectacle lenses (PAL), monovision contact lenses (MV) and multifocal contact lenses (MTF CL) worn in a randomized order. Measures included low contrast road hazard detection and avoidance, road sign and near target recognition, lane-keeping, driving time and legibility distance for street signs. Eye movement data (fixation duration and number of fixations) were also recorded. Results. Street sign legibility distances were shorter when wearing MV and MTF CL than SV and PAL (p Language: en
42 citations