Prof. Yuichi Ogawa Profile

Prof. Yuichi Ogawa

Associate Professor at Kyoto Univ Graduate School of Agriculture

SPIE Involvement:

Author

Proceedings Article | 12 March 2021 Paper

Understanding of the dynamics of water molecules by using terahertz spectroscopy and its bio-applications

Yuichi Ogawa

Proceedings Volume 11789, 1178902 (2021) https://doi.org/10.1117/12.2589583

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Proceedings Article | 12 March 2021 Paper

Preliminary investigation on rice bran residue detection using ultraviolet fluorescence imaging

Dimas Firmanda Al Riza, Saha Khokan Kumar, Tetsuhito Suzuki, Yuichi Ogawa, Naoshi Kondo

Proceedings Volume 11789, 117890I (2021) https://doi.org/10.1117/12.2585757

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Proceedings Article | 12 March 2021 Paper

Estimation of refractive index of eggshell in intact egg using terahertz time-domain spectroscopy

Alin Khaliduzzaman, Keiichiro Shiraga, Naoshi Kondo, Yuichi Ogawa

Proceedings Volume 11789, 117890F (2021) https://doi.org/10.1117/12.2585199

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Proceedings Article | 14 September 2018 Paper

Near field sub-THz array sensor for cell detection

Tetsuhito Suzuki, Yuichi Ogawa

Proceedings Volume 10756, 107560O (2018) https://doi.org/10.1117/12.2322133

KEYWORDS: Dielectrics, Near field, Sensors, Molecules, Terahertz radiation, CMOS sensors, Oscillators, Cancer

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Proceedings Article | 1 May 2017 Presentation + Paper

Fish freshness estimation using eye image processing under white and UV lightings

Katsuhiro Kanamori, Yuri Shirataki, Qiuhong Liao, Yuichi Ogawa, Tetsuhito Suzuki, Naoshi Kondo

Proceedings Volume 10217, 102170E (2017) https://doi.org/10.1117/12.2260622

KEYWORDS: Eye, Ultraviolet radiation, Light sources and illumination, Iris recognition, Image processing, Light emitting diodes, Image analysis, Iris, Cornea, Polarizers

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Proceedings Article | 12 July 2011 Paper

Evaluation of the reasons why freshly appearing citrus peel fluorescence during automatic inspection by fluorescent imaging technique

Md. Abdul Momin, Naoshi Kondo, Makoto Kuramoto, Yuichi Ogawa, Kazuya Yamamoto, Tomoo Shiigi, Kazunori Ninomiya

Proceedings Volume 8000, 80000C (2011) https://doi.org/10.1117/12.890118

KEYWORDS: Luminescence, Ultraviolet radiation, Microscopes, Light emitting diodes, Machine vision, Imaging systems, Image segmentation, Defect detection, Cameras, Visible radiation

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Proceedings Article | 3 June 2011 Paper

Study on excitation and fluorescence spectrums of Japanese citruses to construct machine vision systems for acquiring fluorescent images

Md. Abdul Momin, Naoshi Kondo, Makoto Kuramoto, Yuichi Ogawa, Tomoo Shigi

Proceedings Volume 8027, 80270R (2011) https://doi.org/10.1117/12.885640

KEYWORDS: Luminescence, Ultraviolet radiation, Machine vision, Lamps, Spectrophotometry, Absorption, Light sources and illumination, Visible radiation, Skin, Ultraviolet light emitting diodes

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Proceedings Article | 3 June 2011 Paper

A quantitative study for determination of sugar concentration using attenuated total reflectance terahertz (ATR-THz) spectroscopy

Diding Suhandy, Tetsuhito Suzuki, Yuichi Ogawa, Naoshi Kondo, Takeshi Ishihara, Yuichiro Takemoto

Proceedings Volume 8027, 802705 (2011) https://doi.org/10.1117/12.886183

KEYWORDS: Calibration, Spectroscopy, Glucose, Terahertz radiation, Terahertz spectroscopy, Reflectance spectroscopy, Attenuated total reflectance, Infrared spectroscopy, Absorbance, Near infrared spectroscopy

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The objective of our research was to use ATR-THz spectroscopy together with chemometric for quantitative study in food analysis. Glucose, fructose and sucrose are main component of sugar both in fresh and processed fruits. The use of spectroscopic-based method for sugar determination is well reported especially using visible, near infrared (NIR) and middle infrared (MIR) spectroscopy. However, the use of terahertz spectroscopy for sugar determination in fruits has not yet been reported. In this work, a quantitative study for sugars determination using attenuated total reflectance terahertz (ATR-THz) spectroscopy was conducted. Each samples of glucose, fructose and sucrose solution with different concentrations were prepared respectively and their absorbance spectra between wavenumber 20 and 450 cm^-1 (between 0.6 THz and 13.5 THz) were acquired using a terahertz-based Fourier Transform spectrometer (FARIS-1S, JASCO Co., Japan). This spectrometer was equipped with a high pressure of mercury lamp as light source and a pyroelectric sensor made from deuterated L-alanine triglycine sulfate (DLTGS) as detector. Each spectrum was acquired using 16 cm^-1 of resolution and 200 scans for averaging. The spectra of water and sugar solutions were compared and discussed. The results showed that increasing sugar concentration caused decreasing absorbance. The correlation between sugar concentration and its spectra was investigated using multivariate analysis. Calibration models for glucose, fructose and sucrose determination were developed using partial least squares (PLS) regression. The calibration model was evaluated using some parameters such as coefficient of determination (R²), standard error of calibration (SEC), standard error of prediction (SEP), bias between actual and predicted sugar concentration value and ratio prediction to deviation (RPD) parameter. The cross validation method was used to validate each calibration model. It is showed that the use of ATR-THz spectroscopy combined with appropriate chemometric can be a potential for a rapid determination of sugar concentrations.

Proceedings Article | 3 June 2011 Paper

THz spectroscopy based high sensitivity measurement of protein using a metal mesh device

T. Suzuki, Y. Ogawa, T. Kondo, S. Kamba, N. Kondo

Proceedings Volume 8027, 802706 (2011) https://doi.org/10.1117/12.886691

KEYWORDS: Terahertz radiation, Proteins, Metals, Sensors, Refractive index, Absorption, Spectroscopes, Transmittance, Spectroscopy, Molecules

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Proceedings Article | 16 January 2006 Paper

THz imaging applications

Adrian Dobroiu, Kodo Kawase, Yuichi Ogawa, Masatsugu Yamashita, Chiko Otani

Proceedings Volume 6038, 60380K (2006) https://doi.org/10.1117/12.651350

KEYWORDS: Terahertz radiation, Scattering, Sensors, Absorption, Nonlinear crystals, Photon polarization, Polaritons, Mirrors, Imaging spectroscopy, Oscillators

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Proceedings Article | 6 December 2005 Paper

Terahertz parametric sources and imaging applications

M. Yamashita, Y. Ogawa, C. Otani, K. Kawase

Proceedings Volume 6050, 60500J (2005) https://doi.org/10.1117/12.656044

KEYWORDS: Terahertz radiation, Crystals, Prisms, Absorption, Polaritons, Nonlinear crystals, Laser crystals, Laser scattering, Imaging spectroscopy, Spectroscopy

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Proceedings Article | 8 April 2004 Paper

Component pattern analysis of chemicals using multispectral THz imaging system

Kodo Kawase, Yuichi Ogawa, Yuki Watanabe

Proceedings Volume 5354, (2004) https://doi.org/10.1117/12.528517

KEYWORDS: Terahertz radiation, Chemical analysis, Absorption, Imaging systems, Imaging spectroscopy, Multispectral imaging, Spectroscopy, Oscillators, Inspection, Terahertz technology

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Showing 5 of 12 publications

SPIE Conference Volume | 22 May 2013

Sensing Technologies for Biomaterial, Food, and Agriculture 2013

Conference Committee Involvement (1)

Sensing Technologies for Biomaterial, Food, and Agriculture 2013

23 April 2013 | Yokohama, Japan

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