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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01 Jan 1992
TL;DR: Amorphous Materials (AMI) has served since 1977 as a source of high purity, optically homogeneous plates of selenium-based glasses used in passive IR (FLIR) night vision systems.
Abstract: Amorphous Materials (AMI) has served since 1977 as a source of high purity, optically homogeneous plates of selenium-based glasses used in passive IR (FLIR) night vision systems. Over the past three years, Amorphous Materials has used this chalcogenide glass technology and capability to develop a unique process to prepare optical fibers. The process is based on using 2 inch cores removed from a homogeneous plate and sealed in a chamber which can be heated so that fibers may be pulled from a small tube in the bottom. Methods for cladding and coating with thermal plastic using split dies have been developed. The method has been used to produce flexible, low attenuation fibers based on an As-Se-Te composition. High purity As2S3 glass has been used to produce fibers capable of transmitting substantial amounts of IR laser energy. Physical properties of both fibers are discussed.
18 citations
08 Jun 2014
TL;DR: A new generation of automotive augmented reality systems for driver assistance at night which detects the 3D positions of potential collision partners as well as the driver's eyes to display the warning information at the exact position according to driver's viewing direction on the full-windshield (FWD).
Abstract: The use of Head-Up Displays (HUD) in automobiles to visualize various types of driving information on the windshield has rapidly increased in recent years. However, these HUDs display the graphics on only a specific area of the windshield. This paper introduces a new generation of automotive augmented reality systems for driver assistance at night which detects the 3D positions of potential collision partners as well as the driver's eyes to display the warning information at the exact position according to driver's viewing direction on the full-windshield (FWD). Furthermore, a generic method for unified calibration of various components of this system is proposed. The introduced concepts are validated on a prototype with an external stereo night vision system for obstacle detection, an interior mono night vision system for eye tracking as well as different projection units.
18 citations
TL;DR: The MPC-25NB lens provides a level of distance vision comparable to that of a monofocal intraocular lens and a useful level of near visual acuity without spectacles and should be carefully evaluated for use in patients who require good near vision or night vision.
18 citations
TL;DR: In this article, a green emissive hot-exciton molecule, 1,4-bis((4′-diphenylamino-3-cyano-[1,1′-biphenyl]-4-yl)ethynyl)-2,5-bis(2-ethylhexyloxy)benzene (2EHO-TPA-CNPE) was presented.
Abstract: We herein report a new highly efficient green emissive hot-exciton molecule, 1,4-bis((4′-diphenylamino-3-cyano-[1,1′-biphenyl]-4-yl)ethynyl)-2,5-bis(2-ethylhexyloxy)benzene (2EHO-TPA-CNPE) that consists of an extended D′–π′–A–π–D–π–A–π′–D′ molecular π-system with diphenylamino end units (D′) and ethynylene/phenylene spacers (π/π′). The new molecule exhibits high photoluminescence (PL) quantum efficiencies (ΦPL = 0.95 (solution) and 0.45 (spin-coated neat thin-film)), and a strong PL solvatochromic behavior revealing significant changes in excited state energies/characteristics (locally excited (LE) → hybridized local and charge transfer (HLCT) → charge-transfer (CT)) depending on solvent polarity. Highly efficient (radiative exciton yield (ηr) = 50–59% ≫ 25%) green-emitting OLEDs were fabricated in a conventional device architecture by employing (non-)doped thin-films reaching a maximum current efficiency (CEmax) of 12.0 cd A−1 and a maximum external quantum efficiency (EQEmax) of 5.5%. The emission profile of the non-doped OLED has CIE 1976 (u′, v′) chromaticity coordinates of (0.10, 0.55) corresponding to a night vision imaging system (NVIS) compatible Green A region. 2EHO-TPA-CNPE-based OLED devices of industrial relevance were also fabricated by ink-jet printing the emissive layer and by fabricating an inverted architecture, which possessed respectable device performances of 2.4–6.1 cd A−1. The solid-state solvation effect in OLED devices yields HLCT electronic behavior resulting in high ηr's, which is confirmed by TDDFT to originate from energetically/spatially favorable reverse intersystem crossings (RISCs) (T2/3 → S1). As a unique observation, delayed fluorescence due to this RISC was evident in the PL decay lifetime measurement with a ns-scale lifetime of ∼10 ns. These results clearly allow a better understanding of the structure–photophysical property–electroluminescence relationships in this new class of oligo(p-phenyleneethynylene)-based hot-exciton molecules, and it could open up new opportunities for high-performance solution-processed optoelectronic/sensing applications.
18 citations
TL;DR: The effects of 4 dose levels of marihuana upon the visual autokinetic phenomenon were examined and the amount of apparent movement was greatly increased under the two highest doses.
Abstract: THE EFFECTS OF FOUR DOSE LEVELS OF MARIHUANA UPON THE VISUAL AUTOKINETIC PHENOMENON WERE EXAMINED IN 12 SS. THE AMOUNT OF APPARENT MOVEMENT WAS GREATLY INCREASED UNDER THE TWO HIGHEST DOSES. POSSIBLE HAZARDS ASSOCIATED WITH VEHICLE OPERATION AT NIGHT UNDER MARIHUANA ARE NOTED. /AUTHOR/
18 citations