ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
24.37
Showing 1-18 articles out of 18 articles from the selected issue
  • Type: Cover
    Pages Cover1-
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Index
    Pages Toc1-
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Hiroto SATO, Hideo FUJIKAKE, Jun YONAI, Hiroshi KIKUCHI, Yoshiki IINO, ...
    Type: Article
    Session ID: IPU2000-44/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have developed a new automatic reflected-light reducing system using polarization sensors and a liquid crystal polarizing filter. The system automatically reduces reflected light by driving the liquid crystal polarizing filter according to the polarization direction of incident light which is detected by the polarization sensors. In experiments with polarized incident light, the system is operational if the ratio of polarized light intensity to the total light intensity is over 25%. It is confirmed that the liquid crystal polarizing filter driven with the polarization sensors is useful for image capturing. However, the sensors detect incident light out of the viewing angle of the camera lens. It is found for zooming that polarization sensors need to have the same angle as the camera lens.
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  • Y. Ikeda, T. Shiga, S. Mikoshiba, M. Tsuchiya, S. Shinada
    Type: Article
    Session ID: IPU2000-45/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Mercury-free flat discharge lamps with diagonal sizes ranging from 0.5 to 5.2 inches have been developed for LCD backlights. The lamps have simple structures with insulated electrodes. Optical and electrical characteristics are independent of ambient temperature. The Xe lamps assume luminance build-up within a few μs. Uniform discharges are obtained by adjusting drive pulse voltage and waveforms. As the lamp diagonal becomes larger, luminance and efficacy increase and the dimming range becomes wider. Luminance and efficacy of Hg lamps is lower than that of Xe lamp, except when the Hg lamps is operated at low luminance levels.
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  • H. Nakajima, M. Kurita, H. Kominami, Y. Nakanishi, Y. Hatanaka
    Type: Article
    Session ID: IPU2000-46/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Preparation of SrGa_2S_4:Eu thin films showing green-emission has been carried out by multi source deposition technique, then the structural and luminescent properties of the films were characterized. It was shown in this experiment that the crystallinity, luminance and chromaticity of green emission were improved by the annealing in H_2S or Ar atmosphere. The film annealed at 800℃ in H_2S showed a luminance of about 740 cd/m^2 and CIE coordinates of(0.36, 0.60)under excitation with 2kV and 60 μ A/cm^2.
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  • Tsutomu Ichihara, Takuya Komoda, Nobuyoshi Koshida
    Type: Article
    Session ID: IPU2000-47/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    It is shown that there is a strong correlation between the emission efficiency and silicon nanostructure in a porous polysilicon(PPS) cold cathode. Nondoped polysilicon layer is formed on an n-type<100>silicon wafer and anodized in a solution of HF(50%):ethanol=1:1 under illumination by a 500 Wtungsten lamp. Subsequently, a PPS layer is oxidized in a rapid thermal oxidation(RTO) furnace for 1 hour at a temperature of 900 C.A thin Au film is deposited onto the PPS layer as a positive electrode. The silicon nanostructures are evaluated by photoluminescent spectra. The PPS which has luminescent peak from Si nanocrystallites shows higher emission efficiency. This result supports our multitunneling model which leads to generate quasi-ballistic electron in a PPS cold cathode.
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  • K. Shigemori, R. Kodama, T. Koase, Y. Ochi, H. Azechi, H. Takabe, B.A. ...
    Type: Article
    Session ID: IPU2000-48/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We demonstrated a series of laser experiments on jets and blast waves relevant to astrophysics. The hydrodynamic behavior of the astrophysical jets and the astrophysical blast waves are strongly connected with radiation. We carried out the laser experiments by changing atomic number of the target because the radiative cooling increases with increasing the atomic number of the target. We obtained several data which explain the correlation between the hydrodynamics and the radiative cooling. Also, we compared some important dimensionless parameters of our experimental plasmas and the astrophysical plasmas.
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  • T. Inmaru, J. Muramoto, Y. Nakata, T. Okada, M. Maeda
    Type: Article
    Session ID: IPU2000-49/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We report imaging of behavior of silicon atoms and nano-particles ablated from a silicon target in laser ablation process by Two-Dimensional Laser Induced Fluorescence(2D-LIF) and Ultra-Violet Rayleigh Scattering(UV-RS) techniques. We have also proposed a new method to observe the clusters which could not be observed by above techniques. This involved Re-Decomposition of the clusters and Laser Induced Fluorescence(LIF) measurements, and it is termed as ReD-LIF technique. By using this technique we could observe the temporal and spatial behavior of clusters during nano-particles formation process for the first time.
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  • S. Aoshima, M. Fujimoto, M. Hosoda, Y. Tsuchiya
    Type: Article
    Session ID: IPU2000-50/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Ultrafast nonlinear propagation dynamics of intense 100 femtosecond laser pulses in gaseous media, especially Xe gas, were directly and non-invasively observed by using FTOP(Femtosecond Time-resolved Optical Polarigraphy). A novel method which can generate the instantaneous image of the corss-sectional intensity distribution of light by using consecutive FTOP images was proposed and demonstrated. Futhermore, we succeeded in three dimensional measurement of the pulse propagation using the reconstructed images. As a result, whole propagation dynamics can be observed and an anomalous phenomenon, i.e., the generation of a ring structure in the cross-sectional intensity distribution of the optical pulse was found for the first time.
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  • Shigeaki Uchida, Oleg Kotyayev, Hiroshi Sawada
    Type: Article
    Session ID: IPU2000-51/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The dynamic holography is considered as one of the most promising techniques for correction of dynamic aberrations in large-aperture optical systems when operating in near IR range. The use fluorocarbon Flourinert FC-72, characterized by Brillouin nonlinearity, for recording the dynamic hologram has been demonstrated experimentally. Ten times improvement of hologram's diffraction efficiency(more than 50 %)compared to previous studies while keeping compensation to diffraction limited quality has been recorded with Brillouin enhanced nonlinearity for writing and reading holograms. Perspective of the use of Brillouin enhanced dynamic holography for nonlinear compensation of optical aberrations has been presented.
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  • Shoji KAWAHITO, Masanori FURUTA, Yoshiaki TADOKORO, Hiroyuki OKADA
    Type: Article
    Session ID: IPU2000-52/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Video/still signal processing such as white balancing is usually performed in digital domain. However, in the case of color image sensors, because of the sensitivity deviation among R, G and B pixels, the SNR is limited by the low sensitivity pixel. This problem can be solved by processing the white balancing in analog domain. This paper proposes a new programmable gain amplifier(PGA) with white balancing. The proposed GCA with analog white balancing allows us to achieve higher SNR in the amplified image while maintaining sufficient gain precision of 10bit and low power dissipation. A prototype PGA is implemented using 0.6 um CMOS technology. The power dissipation is 120mW at supply voltage of 3.3V and 20MHz pixel rate.
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  • A. Nakamura, D. Noda, M. Niraula, T. Aoki, Y. Hatanaka
    Type: Article
    Session ID: IPU2000-53/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    II-VI compound semiconductor CdTe is an attractive semiconductor material for applications to solid-state high-energy x-ray and γ-ray imaging systems. We have studied the laser doping technique for fabrication to reticulated detectors. This technique is suitable for the spatially patterned doping to be applied for the fabrication of integrated two-dimensional imaging device. Na_2Te, Sb as p-type dopants and In as n-type dopant for the single crystal CdTe were examined by Eximer laser doping technique. The Hall concentration was +0.39e+19/cm^3 and Electron concentration was -8.95e+18/cm^3.
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  • Katsuhiko Tomita, Daisuke Takamuro, Kazuaki Sawada, Makoto Ishida
    Type: Article
    Session ID: IPU2000-54/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We propose a new field emission type infrared sensor, which is constructed with a PZT ceramic as ferroelectrics material and an Al electrode. The Al electrode is separated by a quartz plate(the distance between the Al electrode and the PZT plate kept about 10μm.) On this sensor, a PZT ceramic plate act field emitter and the Al is an anode electrode. The PZT plate was irradiated by infrared light in a vacuum chamber. From the experiment, anode current was lineally proportional to the incident infrared light power, and the principle of this sensor was confirmed. An emission current is also increase as the anode voltage is increase. On the other hand, the increment of the emission current was not observed on the sensor used a PZT which had reverse spontaneous polarization.
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  • Yuko Uryu, Tanemasa Asano
    Type: Article
    Session ID: IPU2000-55/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A new photodetection device composed of an SOI MOSFET and a photodiode is proposed and the fundamental operation of the device is experimentally studied. The photodiode is connected to the floating body of the SOI MOSFET. This device was targeted at amplification of diode photocurrent by using the lateral bipolar action of the SOI MOSFET. We have investigated devices composed of a partially depleted p-channel SOI MOSFET and a n^+p photodiode which was formed in the substrate Si of a SIMOX wafer. Photo-response in terms of wavelength and intensity, and current gain of the composite device are investigated. It is demonstrated that the current amplification factor increases with decreasing the gate length of the SOI MOSFET and the drain current can be about 70 times as much as the diode photocurrent when the gate length is 0.8 μm.
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  • H. Uozumi, N. Tomoda, Y. Shimizu, R. Nishio, Y. Chatani, H. Senda, T. ...
    Type: Article
    Session ID: IPU2000-56/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A 1/6-inch size VGA format progressive scan CCD has been developed. High sensitivity of 200mV(F8)and wide dynamic range of 450mV has been achieved by best-fitted on-chip micro-lens technology and shallow implantation technology. Also very high light-resistance has been obtained by using pigment type complementary color filter. As a result, this CCD can be used for PC cameras and security cameras without a mechanical shutter system.
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  • Tadashi Sugiki, Shinji Ohsawa, Hiroki Miura, Yoshiyuki Tomizawa, Makot ...
    Type: Article
    Session ID: IPU2000-57/IDY2000-1
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have developed a 1/4" 10bit digital output VGA CMOS image sensor with a column-parallel ADC architecture. It operates with single 3.3V power supply and has 60mW power consumption at 30frame/s. A column-to-column fixed pattern noise in the column-parallel ADC architecture is reduced by the comparator structure of the double inverting amplifier with double clamp circuits. By using the comparator clamp circuit as a part of the correlated double sampling circuit, no linear amplifiers in the column signal path are required, and so amplifier noise is reduced. The total image sensor signal to noise ratio 57dB is obtained.
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  • Type: Appendix
    Pages App1-
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Type: Cover
    Pages Cover2-
    Published: June 23, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (66K)
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