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Dive into the research topics where Hidehiko Negishi is active.

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Featured researches published by Hidehiko Negishi.


Fiber Optic Gyros: 15th Anniversary Conf | 1992

AM noise reduction in fiber optic rotation sensors

Hidehiko Negishi; Yoshinori Takeuchi; Yoshihiko Honjoya; Yuko Takei; Yukio Kasahara

We evaluated the phase and amplitude characteristics of output noise in fiber optic rotation sensors with a single-mode fiber sensing loop. We found that the major source of the noise was amplitude modulation (AM) noise caused by a phase modulator, and that the AM noise always had an approximate 90 degrees phase difference from the rotation signal. Thus, by adjusting the lock-in reference signal phase to the node of the AM noise, the output drift was markedly reduced to about 2 deg/h.


Archive | 1991

Fiber-optic coil and method of manufacturing same

Hidehiko Negishi; Yoshinori Takeuchi; Yukio Kasahara; Yoshihiko Honjoya


Archive | 1991

Optical phase modulator with asymmetric piezoelectric vibrator

Yoshinori Takeuchi; Hidehiko Negishi; Yuko Takei; Ken Idota


Archive | 1993

Optic rotation sensing apparatus and related method including providing synchronous detection at a phase at which the AM noise is minimized

Hidehiko Negishi; Yoshinori Takeuchi; Yuko Takei; Yoshihiko Honjoya


Archive | 1991

Optical phase modulator

Yoshinori Takeuchi; Yuko Takei; Hidehiko Negishi; Ken Idota


Archive | 1991

Sensing coil and fiber-optic gyroscope using the same

Yoshinori Takeuchi; Hidehiko Negishi; Yuko Takei


Optics and Laser Technology | 1995

Study of the signal processing scheme of a FOG using a 3 × 3 coupler

Susumu Tsubosaka; Atushi Watanabe; Yuko Takei; Hidehiko Negishi


Optics and Laser Technology | 1994

Effect of a depolarizer in a fibre-optic gyroscope with a 3 × 3 coupler

Atsushi Watanabe; Toru Kanno; Susumu Tsubosaka; Yoshihiko Honjoya; Hidehiko Negishi


Optics and Laser Technology | 1993

Development of a fibre-optic gyroscope for wide applications

Atsushi Watanabe; Hidehiko Negishi; Yoshihiko Honjoya; Yuko Takei; Toru Kanno


Archive | 1991

The fiber optic coil and manufacturing processes

Hidehiko Negishi; Yoshinori Takeuchi; Yukio Kasahara; Yoshihiko Honjoya

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