Dr. Hirotaka Igawa Profile

Dr. Hirotaka Igawa

at Japan Aerospace Exploration Agency

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Author

Publications (19)

Proceedings Article | 16 March 2016 Paper

Long-term measurements of SPR hydrogen sensor based on hetero-core optical fiber with Au/Ta2O5/Pd/Au multilayers

Ken Takahashi, Ai Hosoki, Michiko Nishiyama, Hirotaka Igawa, Kazuhiro Watanabe

Proceedings Volume 9754, 975415 (2016) https://doi.org/10.1117/12.2210826

KEYWORDS: Hydrogen, Palladium, Sensors, Optical fibers, Gold, Fiber optics sensors, Renewable energy, Metals, Silver, Surface plasmons, Thin films, Nitrogen, Absorption, Multilayers

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Proceedings Article | 1 July 2015 Paper

Multi-point hydrogen detection system using hetero-core structured optical fiber hydrogen tip sensor based on surface plasmon resonance and pseudorandom noise code correlation reflectometry

Ai Hosoki, Michiko Nishiyama, Hirotaka Igawa, Atsushi Seki, Kazuhiro Watanabe

Proceedings Volume 9655, 965515 (2015) https://doi.org/10.1117/12.2184381

KEYWORDS: Hydrogen, Sensors, Palladium, Optical fibers, Signal to noise ratio, Reflectometry, Gold, Surface plasmons, Reflection, Fiber optics sensors

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Proceedings Article | 2 June 2014 Paper

Dynamic measurement of inside strain distributions in adhesively bonded joints by embedded fiber Bragg grating sensor

Hideaki Murayama, Xiaoguang Ning, Kazuro Kageyama, Daichi Wada, Hirotaka Igawa

Proceedings Volume 9157, 9157A0 (2014) https://doi.org/10.1117/12.2059503

KEYWORDS: Fiber Bragg gratings, Adhesives, Sensors, Sensing systems, Spatial resolution, Carbon, Fiber optics sensors, Reflectometry, Structural health monitoring, Aerospace engineering

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Proceedings Article | 2 June 2014 Paper

Long-gauge FBGs interrogated by DTR3 for dynamic distributed strain measurement of helicopter blade model

M. Nishiyama, H. Igawa, T. Kasai, N. Watanabe

Proceedings Volume 9157, 91579E (2014) https://doi.org/10.1117/12.2059452

KEYWORDS: Fiber Bragg gratings, Sensors, Aerospace engineering, Spatial resolution, Structural health monitoring, Optical filters, Wavelength division multiplexing, Light sources, Reflectometry, Electromagnetic coupling

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Proceedings Article | 2 June 2014 Paper

Detection of local birefringence in embedded fiber Bragg grating caused by concentrated transverse load using optical frequency domain reflectometry

D. Wada, H. Murayama, H. Igawa

Proceedings Volume 9157, 91576E (2014) https://doi.org/10.1117/12.2059413

KEYWORDS: Fiber Bragg gratings, Birefringence, Finite element methods, Polarization, Reflectometry, Optical fibers, Carbon, Structural health monitoring, Sensors, Composites

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Proceedings Article | 15 October 2013 Paper

Distributed dynamic strain measurement using long-gauge FBG and DTR3 interrogator based on delayed transmission/reflection ratiometric reflectometry

M. Nishiyama, H. Igawa, T. Kasai, N. Watanabe

Proceedings Volume 8924, 892412 (2013) https://doi.org/10.1117/12.2030872

KEYWORDS: Fiber Bragg gratings, Sensors, Spatial resolution, Reflectometry, Structural health monitoring, Calibration, Aerospace engineering, Wavelength division multiplexing, Optical filters, Aluminum

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Proceedings Article | 17 October 2012 Paper

Distributed strain and load monitoring of 6 m composite wing structure by FBG arrays and long-length FBGs

Hideaki Murayama, Kazuki Tachibana, Yoshiyasu Hirano, Hirotaka Igawa, Kazuro Kageyama, Kiyoshi Uzawa, Toshiya Nakamura

Proceedings Volume 8421, 84212D (2012) https://doi.org/10.1117/12.970292

KEYWORDS: Fiber Bragg gratings, Composites, Skin, Sensors, Sensing systems, Fiber optics sensors, Fiber optics, Structural health monitoring, Carbon, Reflectometry

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Proceedings Article | 17 October 2012 Paper

Distributed monitoring of fiber Bragg gratings under local lateral loads using optical frequency domain reflectometry

Daichi Wada, Hideaki Murayama, Hirotaka Igawa

Proceedings Volume 8421, 84213X (2012) https://doi.org/10.1117/12.968197

KEYWORDS: Fiber Bragg gratings, Reflectometry, Finite element methods, Optical fibers, Birefringence, Polarization, Interferometers, Sensing systems, Optical coatings, Aerospace engineering

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Proceedings Article | 18 May 2011 Paper

Application of simultaneous strain and temperature measurement technique using polarization maintaining fiber Bragg grating for distributed sensing based on OFDR

Daichi Wada, Hideaki Murayama, Hirotaka Igawa, Koji Omichi, Kazuro Kageyama

Proceedings Volume 7753, 77537H (2011) https://doi.org/10.1117/12.885977

KEYWORDS: Temperature metrology, Fiber Bragg gratings, Sensing systems, Fiber optics sensors, Sensors, Reflectometry, Spatial resolution, Polarization maintaining fibers, Transmission electron microscopy, Fiber optics

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Proceedings Article | 17 May 2011 Paper

Distributed sensing with OFDR and its application to structural health monitoring

Hideaki Murayama, Hirotaka Igawa, Koji Omichi, Yuichi Machijima

Proceedings Volume 7753, 775305 (2011) https://doi.org/10.1117/12.886028

KEYWORDS: Fiber Bragg gratings, Structural health monitoring, Sensing systems, Fiber optics sensors, Sensors, Spatial resolution, Fiber optics, Composites, Adhesives, Reflectometry

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Proceedings Article | 5 October 2009 Paper

Measurement of distributed strain and load identification using 1500 mm gauge length FBG and optical frequency domain reflectometry

Hirotaka Igawa, Hideaki Murayama, Toshiya Nakamura, Isao Yamaguchi, Kazuro Kageyama, Kiyoshi Uzawa, Daichi Wada, Isamu Ohsawa, Makoto Kanai, Koji Omichi

Proceedings Volume 7503, 75035I (2009) https://doi.org/10.1117/12.834236

KEYWORDS: Fiber Bragg gratings, Sensors, Reflectometry, Spatial resolution, Fiber optics sensors, Interferometers, Structural health monitoring, Tunable lasers, Fiber optics, Reflectors

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Proceedings Article | 5 October 2009 Paper

Simultaneous measurement of strain and temperature by means of polarization division multiplexing optical frequency domain reflectometry

Koji Omichi, Yoshihiro Terada, Akira Sakamoto, Shunichiro Hirafune, Daichi Wada, Hideaki Murayama, Hirotaka Igawa

Proceedings Volume 7503, 75036C (2009) https://doi.org/10.1117/12.834233

KEYWORDS: Temperature metrology, Polarization, Multiplexing, Reflectometry, Birefringence, Fiber Bragg gratings, Polarization maintaining fibers, Interferometers, Fusion splicing, Light wave propagation

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Proceedings Article | 16 May 2008 Paper

Distributed strain measurement of welded tubular joint with long gauge FBG

H. Murayama, K. Kageyama, K. Ohara, K. Uzawa, M. Kanai, H. Igawa

Proceedings Volume 7004, 700452 (2008) https://doi.org/10.1117/12.786182

KEYWORDS: Fiber Bragg gratings, Sensors, Spatial resolution, Interferometers, Computed tomography, Acoustic emission, Tomography, Fiber optics sensors, Tunable lasers, Computing systems

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Proceedings Article | 16 May 2008 Paper

Process/health monitoring for wind turbine blade by using FBG sensors with multiplexing techniques

S. H. Eum, K. Kageyama, H. Murayama, K. Uzawa, I. Ohsawa, M. Kanai, H. Igawa

Proceedings Volume 7004, 70045B (2008) https://doi.org/10.1117/12.786240

KEYWORDS: Fiber Bragg gratings, Sensors, Sensing systems, Wavelength division multiplexing, Multiplexing, Manufacturing, Structural health monitoring, Composites, Optics manufacturing, Wind turbine technology

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Proceedings Article | 16 May 2008 Paper

Biaxial measurement of optical frequency domain reflectometry using polarization maintaining fiber Bragg grating

Koji Omichi, Akira Sakamoto, Shunichiro Hirafune, Tetsuya Sakai, Hideaki Murayama, Hirotaka Igawa

Proceedings Volume 7004, 70042A (2008) https://doi.org/10.1117/12.785953

KEYWORDS: Fiber Bragg gratings, Polarization maintaining fibers, Optical testing, Polarization, Lithium, Refractive index, Reflectometry, Fusion splicing, Sensors, Spatial resolution

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Proceedings Article | 20 April 2007 Paper

Resin flow monitoring in vacuum-assisted resin transfer molding using optical fiber distributed sensor

Soohyun Eum, Kazuro Kageyama, Hideaki Murayama, Isamu Ohsawa, Kiyoshi Uzawa, Makoto Kanai, Hirotaka Igawa

Proceedings Volume 6526, 65262T (2007) https://doi.org/10.1117/12.715339

KEYWORDS: Fiber Bragg gratings, Silicon, Sensors, Composites, Optical fibers, Video, Cameras, Fiber optics sensors, Sensing systems, Signal processing

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Proceedings Article | 23 May 2005 Paper

Measurements of strain distributions with a long gauge FBG sensor using optical frequency domain reflectometry

H. Igawa, H. Murayama, T. Kasai, I. Yamaguchi, K. Kageyama, K. Ohta

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.624250

KEYWORDS: Fiber Bragg gratings, Sensors, Reflectometry, Signal processing, Interferometers, Sensing systems, Finite element methods, Spatial resolution, Tunable lasers, Information visualization

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Proceedings Article | 25 May 1994 Paper

Propagation of shock waves in a discharge-pumped XeCl excimer laser

Go Imada, H. Igawa, Katsumi Masugata, Wataru Masuda, Kiyoshi Yatsui

Proceedings Volume 2118, (1994) https://doi.org/10.1117/12.176677

KEYWORDS: Wave propagation, Electrodes, Excimer lasers, Photography, Atmospheric propagation, Visualization, Cameras, Picosecond phenomena, Mirrors, Lasers

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Proceedings Article | 4 May 1993 Paper

All-solid-state excitation circuit using saturable transformer for excimer laser excitation

Kiyoshi Yatsui, Katsumi Masugata, Kazuma Kurihara, I. Satoh, H. Igawa, Go Imada, Takashi Sakugawa, Yasuo Kataoka, Kazuhiko Shibata, Masao Shigeta

Proceedings Volume 1810, (1993) https://doi.org/10.1117/12.144672

KEYWORDS: Transformers, Switching, Magnetism, Excimer lasers, Picosecond phenomena, Chemical lasers, Mirrors, Switches, Cobalt, Reflectivity

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Showing 5 of 19 publications

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