The optical setup for holographic projection on the scatterings in fluorescent liquids is presented. Such media can be used as volumetric screens for near-eye holographic displays, solving the ...problem of speckle noise and very small exit pupils in existing setups. Three different oils (canola, olive and engine oil) with 532 nm laser and tonic water with 405 nm laser are used for projecting holographic fields, the quality of such images is investigated. The laser wavelength is cut out from acquisition on a camera and only filtered fluorescent light is observed. The best and brightest results are obtained with engine oil. Full Text: PDF ReferencesX. Li, C. P. Chen, H. Gao, et al. "Video-Rate Holographic Display Using Azo-Dye-Doped Liquid Crystal", Journal of display technology 10(6), 438-443 (2014). CrossRef X. Li, Z. Song, F. Li, X. Dong, W. Liu, "79‐3: Video‐rate Holographic Display in ZnSe layer‐assisted Quantum Dot Doped Liquid Crystal with High‐photorefractive Sensitivity", SID Symposium Digest of Technical Papers. Vol. 48. No. 1. 2017, CrossRef Sasaki, Takeo, et al. "Real-time dynamic hologram in photorefractive ferroelectric liquid crystal with two-beam coupling gain coefficient of over 800 cm–1 and response time of 8 ms", Applied Physics Letters 6(2) (2013) CrossRef N. Tsutsumi, K. Kinashi, A. Nomura, W. Sasaki, "Quickly Updatable Hologram Images Using Poly(N-vinyl Carbazole) (PVCz) Photorefractive Polymer Composite", Materials 5.8: 1477-1486 (2012) CrossRef M. Makowski, "Simple holographic projection in color", et al. Optics express 20.22: 25130-25136 (2012) CrossRef A. Yagi, M. Imura, Y, Kuroda, O. Oshiro, "360-degree fog projection interactive display", SIGGRAPH Asia 2011 Emerging Technologies. ACM, (2011) CrossRef C.H. Hsu, K. L. Hua, W. H. Cheng. "Omni-Tube: a low-cost portable omnidirectional interactive 3D display", SIGGRAPH Asia 2012 Posters. ACM, (2012) CrossRef Z. Zeng, H. Zheng, X. Lu, H. Gao, Y. Yu, "Dynamic holographic three-dimensional projection based on liquid crystal spatial light modulator and cylindrical fog screen", Opt Rev (2015) 22: 853 CrossRef I. Rakkolainen, "Feasible mid-air virtual reality with the immaterial projection screen technology", 3DTV-Conference, Tampere (2010) CrossRef S. Yanfeng, et al. "A multi-plane optical see-through holographic three-dimensional display for augmented reality applications", Optik 157: 190-196 (2018) CrossRef G. Li, D. Lee, Y. Jeong, J. Cho, B. Lee, "Holographic display for see-through augmented reality using mirror-lens holographic optical element", Opt. Lett. 41(11), 2486-2489 (2016) CrossRef C. L. Lin, Y. Z. Su, M. W. Hung, K. C. Huang "Augmented reality system", Proc. SPIE 7798, Applications of Digital Image Processing XXXIII, 779826 (2010) CrossRef A. Maimone, A. Georgiou, J. S. Kollin, "Holographic near-eye displays for virtual and augmented reality", ACM Trans. Graph. 36, 4, 1-16 (2017) CrossRef M. Quinten, Optical properties of nanoparticle systems: Mie and beyond (John Wiley & Sons 2010). CrossRef J.-W. Liaw, S.-W. Tsai, H.-H. Lin, T.-C. Yen, B.-R. Chen, "Wavelength-dependent Faraday–Tyndall effect on laser-induced microbubble in gold colloid", Journal of Quantitative Spectroscopy and Radiative Transfer 113(17), 2234-2242 (2012), CrossRef T. Mu et al. "Classification of edible oils using 532 nm laser-induced fluorescence combined with support vector machine", Anal. Methods 5, 6960 (2013) CrossRef T. Mu et al. "Classification of Motor Oil Using Laser-Induced Fluorescence and Phosphorescence", Analytical Letters 49:8, 1233-1239 (2015) CrossRef V. Rostampour, M. J. Lynch, "Quantitative Techniques To Discriminate Petroleum Oils Using LED-induced Fluorescence", WIT Transactions on Ecology and the Environment 95, 265 262 (2006) CrossRef F. Wyrowski and O. Bryngdahl, "Iterative Fourier-transform algorithm applied to computer holography", Opt. Soc. Am. A 5(7), 1058-1065 (1988) CrossRef
Celem opracowania jest ukazanie efektów wykorzystania reklamy telewizyjnej w kontekście ich skutków – zachowań konsumentów. Wykorzystując literaturę krajową oraz zagraniczną, a także dane dotyczące ...działań reklamowych realizowanych w IV kw. 2015 roku przez jednego z oferentów produktów mleczarskich, przedstawiono uzyskiwane efekty reklamy – o charakterze ekonomicznym (marketingowym), a także behawioralnym i komunikacyjnym. W opracowaniu wykorzystano dane pochodzące z przeprowadzonego pod koniec 2015 roku sondażu bezpośredniego, skierowanego do klientów w placówkach handlowych w Gdańsku.
Lu2Y2Al2O9:Pr crystals have been grown by the micro-pulling-down method and their basic luminescence properties have been examined in order to estimate their utility for scintillator applications. ...The performed studies comprise the measurements of radioluminescence spectra as a function of temperature, photoluminescence emission and excitation spectra, and low temperature thermoluminescence glow curves. A comparison of the present results with those obtained recently for Y4Al2O9:Pr indicates that in spite of a higher density Lu2Y2Al2O9:Pr is a much less promising material, which is mainly due to the absence of the fast Pr3+d-f emission.
•LuYAM:Pr crystals have been grown by the μPD method.•Radio-, photo-, and thermoluminescence of LuYAM:Pr have been studied.•At RT fast d-f luminescence of Pr3+ ions has not been detected.
Scintillation properties of (GaxAl1−x)2O3 ceramics Makowski, Michał; Witkowski, Marcin E.; Drozdowski, Winicjusz ...
Radiation physics and chemistry (Oxford, England : 1993),
July 2023, Letnik:
208
Journal Article
Recenzirano
In this communication scintillation properties of (GaxAl1−x)2O3 (x = 1, 0.75, 0.5, and 0.2) ceramics are reported. The investigated samples have been fabricated through two-step spark plasma ...sintering. Their properties have been studied by means of pulse height spectra, scintillation time profiles, radio- and thermoluminescence. Although room temperature scintillation yields of the samples do not exceed 1000 ph/MeV, their scintillation decays appear relatively fast as compared to single crystals.
•(GaxAl1−x)2O3 ceramics have been grown by a two-step spark plasma sintering method.•Scintillation properties have been examined by means of pulse height spec tra and scintillation time profiles.•Glow curves have been deconvoluted and trap parameters have been found.•Radioluminescence spectra have been presented.
A new technique of design and reconstruction of a color hologram is presented. The design is based on an iterative multi-plane optimization algorithm. It allows to encode three different images for a ...reconstruction at various distances measured from the hologram plane. The distances are calculated in order to obtain a fine color compound image when the hologram is illuminated by three laser beams of RGB colors. A single light phase modulator is used instead of three. The reconstructed red, green and blue component images remain in an exact match in size and position. The 2-D color image is reconstructed at a pre-assumed distance and its color pattern can be easily controlled by the choice of the three input component images.
We present the basic scintillation properties of MgGa
2
O
4
and ZnGa
2
O
4
crystals grown at Leibniz-Institut für Kristallzüchtung by the Czochralski and the Vertical Gradient Freeze methods, ...respectively. We prove that these two Ga-based spinels do scintillate under gamma irradiation, currently displaying scintillation yields up to about 2500 ph/MeV. We also show the scintillation time profiles and their anticorrelation with the scintillation yields (the lower the yield, the faster the scintillation decay). Finally, we indicate that radioluminescence of both MgGa
2
O
4
and ZnGa
2
O
4
is much more efficient at low temperatures, which suggests the presence of a strong thermal quenching decreasing their yield towards room temperature.
β-Ga2O3 is an emerging ultra-wide bandgap (4.9 eV) oxide semiconductor that additionally scintillates under gamma excitation. A unique combination of transparency in the UV/visible spectrum, ...semiconducting, and scintillation properties makes that compound interesting for fundamental studies of underlying physics and design of novel devices, in particular compact detectors for gamma radiation. Undoped, and singly (Ce, Si, Al), doubly (Ce + Si, Ce + Al), and triply (Ce + Al + Si) doped bulk β-Ga2O3 single crystals were grown by the Czochralski method under very similar conditions and systematically studied in terms of electrical and optical properties that were correlated with scintillation light yield under gamma excitation. A wide spectrum of doping enabled to control the free electron concentration in semiconducting β-Ga2O3 crystals within almost three orders of magnitude (7 × 1015–6 × 1018 cm−3) with the Hall mobility approaching 150 cm2 V−1s−1. The maximum of light yield under gamma excitation was recorded for undoped and Ce-doped β-Ga2O3 single crystals having the free electron concentration of mid 1016 cm−3. The light yield significantly decreases for both electrically insulating and highly conducting (Si-doped) crystals. None of the dopants (Ce, Si, Al) introduces any absorption bands in the spectral region of light emission (340–410 nm) under gamma excitation. The dopants in quest do not affect the structure of neither cathodoluminescence (CL) nor radioluminescence (RL) emissions, but modify their absolute intensity. A double-band structure of RL spectra corresponds to UV and blue emissions observed in CL spectra that are assigned to self-trapped excitons.
Display omitted
•Doped semiconducting β-Ga2O3 was grown and studied for gamma radiation detection.•The crystals are fully transparent to scintillation emissions at 340–410 nm.•Maximum of light yield was found at free electron concentration of mid 1016 cm−3.•Luminescence spectra point to self-trapped excitons in scintillation mechanism.
Mo co-doped Y0.8Gd2.2(Al5-xGax)O12:Ce (x = 2.6 and 3) multicomponent garnet crystals were grown by the micro-pulling down method and the luminescence and scintillation properties were investigated. ...The temperature dependences of radioluminescence yield and photoluminescence decay time were measured to investigate the temperature stability of these crystals. Under excitation with 662 keV γ rays at room temperature, Y0.8Gd2.2(Al2.4Ga2.6)O12:Ce,Mo shows a higher light yield of 53,800 ph/MeV whereas Y0.8Gd2.2(Al2Ga3)O12:Ce,Mo shows a faster scintillation decay times of 50 ns (56%) + 275 ns (44%). A decrease of radioluminescence yield at low temperature observed in correlation with an appearance of the large thermoluminescence peaks can be attributed to the localization of charge carriers at shallow traps.
•Scintillation properties of Y0.8Gd2.2(Al5-xGax)O12:Ce,Mo (x = 2.6, 3) crystals are investigated.•The sample x = 2.6 shows high LY value of 53,800 photons/MeV.•The sample x = 3 shows faster scintillation decays than the former due to thermal ionization of Ce3+ 5d1 excited state.•Luminescence quenching takes place at low temperature due to localization of carriers in traps.
PDF
