Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1992-01-08
1994-02-22
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1964
Patent
active
052892573
ABSTRACT:
A signal processing apparatus for a phase modulation optical gyro includes: a circuit for taking components of frequencies fm, 2fm and 4fm from a photoelectric output signal proportional to an input rotation angular velocity and converting the components to analog signals of a frequency .DELTA.fm; a converter for converting the analog signals to a digital signal; a unit for forming a pair of digital signals shifted in phase by 90.degree. from the digital signal, effecting a digital multiplication between the digital signal and the pair of digital signals to take DC components therefrom, and obtaining digital demodulation signals; a unit for discriminating a quadrant of presence of a phase difference of light based on Sagnac effect from the digital demodulation signals; a unit for computing a present phase modulation index from the digital demodulation signals; and a unit for outputting a digital signal proportional to the input rotation angular velocity based on the digital demodulation signals and each output of the discriminating unit and computing unit. As a result, it is possible to obtain a gyro output signal in accurate proportion to the input rotation angular velocity and also expand a maximum range of detection of the angular velocity, while improving characteristics of the optical gyro.
REFERENCES:
patent: 4765739 (1988-08-01), Koizumi et al.
patent: 4776700 (1988-10-01), Frigo
patent: 5048962 (1991-08-01), Kurokawa et al.
"OFS " 84 Conference Proceedings, Sep. 5-7, 1984, Stuttgart, RFA, K. B. Hn, et al.: "Fiber Optic Gyro with Digital Data Processing", pp. 251-258.
Search report of the corresponding French application No. 92 00199, searched on Jan. 29, 1993.
Fiber-Optic Gryros: 19th Anniversary Conference (1986), vol. 719, pp. 101-112, 1986 SPIE vol. 719.
Hayakawa Yoshiaki
Hirano Takafumi
Kurokawa Akihiro
Narise Hiroshi
McGraw Vincent P.
Mitsubishi Precision Co., Ltd.
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