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A time-delay calibrated method for cornea hysteresis and intraocular pressure measurement
Springer Science and Business Media LLC - Tập 23 Số 2 - Trang 340-345 - 2016
Wang, Kuo-Jen, Tsai, Che-Liang, Wang, Wai, Hsu, Long, Hsu, Ken-Yuh
The presence of cornea hysteresis (CH) in characterizing the intraocular pressure (IOP) of a human eye deteriorates the accuracy of IOP. To suppress CH, the pressure gauge of a tonometer must be located as close as possible to the cornea. However, this arrangement is unpractical because appropriate working distance to the cornea is required. In this paper, a time-delay calibrated (TDC) method is p...... hiện toàn bộ
Layered blind deconvolution using subband filter banks
Springer Science and Business Media LLC - Tập 4 - Trang 164-166 - 1997
Takanori Nomura, Masaya Tamaru
A blind deconvolution method using the concept of subband filter banks has been proposed. This method makes possible the speedy convergence of solution, due to estimation of supports of the reconstructed images by a deconvolution in the lower layer. We apply the method to blind deconvolution by a simulated annealing algorithm and confirm its usefulness.
Diffractive phase element for shrinking focal spot diameter: Design, fabrication, and application to laser beam lithography
Springer Science and Business Media LLC - - 2001
Yusuke Ogura, Jun Tanida, Yoshiki Ichioka, Yoshiaki Mokuno, K. Matsuoka
Photorefractive effect in ferroelectric liquid crystals
Springer Science and Business Media LLC - Tập 21 - Trang 99-109 - 2014
Takeo Sasaki, Yumiko Naka
In this paper, we review recent progress of research on the photorefractive effect of ferroelectric liquid crystals. The photorefractive effect is a phenomenon that forms a dynamic hologram in a material. The interference of two laser beams in a photorefractive material establishes a refractive index grating. This phenomenon is applicable to a wide range of devices related to diffraction optics in...... hiện toàn bộ
Sensing of refractive index by using guided mode resonance 1D TiO2 grating at visible wavelength under normal incidence
Springer Science and Business Media LLC - Tập 30 - Trang 427-435 - 2023
Khizzra Aslam, Nouraiz Mushtaq, Guoguo Kang, Zhao Luo
The effects of guided mode resonance (GMR) are largely used in optical communications because of its accurate line width and good capability. Specially study of titanium dioxide (TiO2) gratings on glass substrate exhibit very low losses and can have excellent diffraction abilities along annihilation ratios. In this study a significant refractive index sensing by using the grating mode resonance in...... hiện toàn bộ
Vibration Analysis by Phase Shifting Digital Holography
Springer Science and Business Media LLC - Tập 11 - Trang 297-299 - 2004
Fucai Zhang, Jesus D. R. Valera, Ichirou Yamaguchi, Masayuki Yokota, Godfrey Mills
Phase-shifting digital holography has been used for the study of vibrating objects. The time-averaged complex amplitude of Fresnel diffracted field due to a vibrating object was obtained by using a three-step phase-shifting algorithm. Taking the inverse Fresnel transform of the complex amplitude resulted in an image of the object superimposed with Bessel fringes. The Bessel fringes are contour map...... hiện toàn bộ
Analysis of temperature change effects on hologram recordingand a compensation method
Springer Science and Business Media LLC - Tập 15 - Trang 11-18 - 2008
Mitsuru Toishi, Tomiji Tanaka, Kenjiro Watanabe
For commercialization of holographic storage drives, the effects of temperature changes on holographic medium is critical. There has been no systematic study on the effect of temperature change on hologram recording properties. We believe that the monomer-diffusion speed and polymerization rate changes are critical for hologram-recording properties and estimate those parameters on each temperature...... hiện toàn bộ
Evaluation of improvement of diffuse optical imaging of brain function by high-density probe arrangements and imaging algorithms
Springer Science and Business Media LLC - Tập 23 - Trang 346-353 - 2016
Yusuke Sakakibara, Kazuki Kurihara, Eiji Okada
Diffuse optical imaging has been applied to measure the localized hemodynamic responses to brain activation. One of the serious problems with diffuse optical imaging is the limitation of the spatial resolution caused by the sparse probe arrangement and broadened spatial sensitivity profile for each probe pair. High-density probe arrangements and an image reconstruction algorithm considering the br...... hiện toàn bộ
Measurement of atmospheric NO2 column density with kitt peak solar flux atlas as a reference
Springer Science and Business Media LLC - Tập 4 - Trang 240-245 - 1997
Jian Guo Niu, Yasushi Sakurada, Hiroaki Kuze, Nobuo Takeuchi
The vertical column abundance of NO2 is measured using direct sunlight. The solar spectra in the wavelength region of 430–450 nm observed from the earth’s surface are ratioed with a reference spectrum taken from the Kitt Peak Solar Flux Atlas. The large Fraunhofer features (20–40%) are eliminated by wavelength correction, resolution matching and ratioing of observed spectra to the reference. The r...... hiện toàn bộ
Estimation of Absorbing Components in a Local Layer Embedded in the Turbid Media on the Basis of Visible to Near- Infrared (VIS-NIR) Reflectance Spectra
Springer Science and Business Media LLC - Tập 10 - Trang 427-435 - 2003
Izumi Nishidate, Yoshihisa Aizu, Hiromichi Mishina
A new method is studied for estimating the hemoglobin concentration and oxygenation of a local blood layer in a human skin tissue model on the basis of visible and near infrared reflectance spectra. This method uses the iterative Monte Carlo technique for a multi-layered skin tissue model. The numerical simulation was performed to investigate the effects of estimation errors for epidermis and derm...... hiện toàn bộ
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