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Your search keyword '"Norio Tsuda"' showing total 9 results
Start Over Author "Norio Tsuda" Publisher laser society of japan
9 results on '"Norio Tsuda"'

3. Study on Small Vibration Sensor by Self-Coupling Effect of Semiconductor Laser

Author

Jun Yamada, Yasuhiko Nawa, and Norio Tsuda

Subjects
Vibration, Interferometry, Materials science, Laser diode, law, Acoustics, Active vibration control, Laser, Sensitivity (electronics), Laser Doppler vibrometer, Signal, law.invention
Abstract

Small vibration sensors with the laser interferometer have been developed. However, there are some disadvantages, for example, weakness to external vibration, difficulty in optical alignment, and so on. These disadvantages are improved by making use of a self-coupling effect of a semiconductor laser, because our sensor is composed of only a laser diode and a lens. When a small vibration, whose amplitude is less than half-wavelength of the laser, is measured, a reference signal is needed. The reference signal is generated by moving the sensor head quickly. And also an output signal is needed at maximum sensitivity. This output signal is generated by moving the sensor head slowly. The signal is controlled by a microcomputer. The vibration amplitude is evaluated from the ratio of the output signal to the reference one by the microcomputer. This sensor can detect a small vibration with minimum amplitude of about 10nm, and a small vibration is able to be measured irrespective of the frequency in the range between 500 Hz and 3000 Hz.

Published
2008
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4. Collision Avoidance Sensor System with Beam Width Selection Method

Author

Jun Yamada and Norio Tsuda

Subjects
Physics, Beam diameter, business.industry, Edge (geometry), Laser, Signal, law.invention, Pulse (physics), Light intensity, Optics, Semiconductor, law, Point (geometry), business
Abstract

A safety area sensor for automatic guided vehicles using a semiconductor laser and a CCD camera has been studied. But this detection system, which depends on the light intensity, has the weak point for disturbance light. A new detection method is proposed which is called beam width selection method. This method is able to select a laser light from the beam width difference between a laser light and a disturbance light. The edge component of the video signal is selected by a differentiation circuit, and the pulse signals are produced from the positive differentiation signal and negative one. The laser light signal can be obtained from the product of these pulse signals. The detected distance is 3 m and the detected width is 1 m under the disturbance light of 10000lx. The repetition error for various color obstacles is below 0.2 percent.

Published
2003
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5. レーザー計測

Author

KUNIHIKO NAKAYAMA, MASAYO NAKANE, KUSUO ASHIBE, JUNKO WATANABE, KATSUSHI NISHIZAWA, HIROAKI UEDA, Nobuhiko Koga, Ken-ichi Ozawa, Yasuhiro Kubota, Yasunori Saito, Nobuo Sugimoto, Tetsuo Aoki, Hiroo Kunimori, Toshikazu Itabe, K. Yamaguchi, A. Ueda, H. Yoneda, K. Ueda, Ko-ich WASEDA, Masatake O-HASI, T. Okada, J. Muramoto, Y. Nakata, M. Maeda, Shu Wing LI, Tadashi ARUGA, Shin YOSHIKADO, Shin-ichi KITA, Satoshi Kawata, Tsuno Horiguchi, Hiroo Wakaumi, Hiroshi Ajiki, Yuichiro Mizuno, Norio Tsuda, and Jun Yamada

Published
1997
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8. Improvement of discharge guiding effect using strongly and weakly ionized plasma channels for laser triggered lightning

Author

T. Kawabata, K. Midorikawa, Shigeki Hayashi, Takashi Noguro, H. Tang, Isao Kojima, Yukio Sakagami, Kazumasa Honda, Minoru Obara, Kazuhisa Hashimoto, T. Kawachi, S. Uchida, Masayuki Suzuki, Zen-Ichiro Kawasaki, Y. Ishikubo, Kozo Hirose, I. Okuda, Tetsuzi Hattori, Y. Owadano, S. Yamagami, Koji Nagasaka, Hideo Hirose, E. Fujiwara, Nobuki Kawashima, Chanhwan Lim, Takahisa Jitsuno, K. Ando, C. Yamanaka, Tsuyoshi Fukuda, Iwao Kitazima, Kazunobu Maruyama, Y. Shimada, A. Bartnikc, E. Takahashi, H. Fiedorowicz, Yoko Nakano, Saori Ojika, O. Maya, S. Sebban, K. Murai, A. Klisnik, Yasukazu Izawa, Hideaki Niki, Tamio Hara, Satoshi Nakamoto, C. Fujikawa, Hitoshi Nakano, Junko Yamada, T. Ohchi, Goichi Ohmae, Norio Tsuda, N. Tohyama, K. Okasaka, H. Daido, Aki Shimamura, Takeyoshi Nakayama, Y. Komatsu, Takamasa Hayasaka, Huajing Tang, Takashi Yagi, P. Zeitaun, Yasuhiro Yamashita, Yasusi Takizawa, Ryuuji Sugimoto, Kazuya Takeda, Yutaka Nagata, Y. Matsumoto, Atsushi Fujii, S. Wang, T. Yamanaka, A. Ogata, K. Kuwahara, N. Sakaya, N. Yamaguchi, Hiroki Yoshida, G. Huang, D. Shimoda, Hideaki Kusama, Jun Yamada, Y. Kato, S. Kato, and Y. Gu

Subjects
Physics, law, Ionization, Plasma, Atomic physics, Laser, Lightning, law.invention
Published
1999
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