Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-12-21
1991-12-24
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
G01C 1972
Patent
active
050746650
ABSTRACT:
An improved fiber optic rotation sensing technique and an improved optical fiber gyro are provided which exhibit increased sensitivity to and linearity of rotation measurement by using a special dual-section, counter-wound fiber coil for measuring the Sagnac phase shift resulting from rotation of the coil. The optical fiber coil has a plurality of turns and is formed of at least two separate interconnected coil sections each having a predefined number of turns of fiber. In the gyro arrangement, the separate sections are axially disposed adjacent to each other in such a way that the direction of winding of the turns in one of the coil sections is counter to the direction of winding of the turns in the other of the coil sections. The plurality of turns in each coil section is selected to be such that the sum of the effective lengths defined thereby is sufficient to realize the desired gyro modulation frequency. At the same time, the Sagnac phase shift for a given rotation rate is made proportional to the difference between the effective lengths of the coil sections and remains within a desired threshold level even if the overall effective length of the fiber coil is increased.
REFERENCES:
patent: 4545682 (1985-10-01), Greenwood
Bergh et al., "An Overview of Fiber-Optic Gyroscopes", pp. 91-107, Journal of Lightwave Technology, vol. LT-2, No. 2, Apr. 1984.
Giallorenzi et al., "Optical-Fiber Sensors Challenge the Competition", IEEE Spectrum, Sep. 1986, pp. 44-49.
Bergh et al., "All-Single-Mode Fiber-Optic Gyroscope", Optics Letters, Apr. 1981, pp. 198-200.
Dyott Richard B.
Huang Yung-Yien
Andrew Corporation
Irfan Kareem M.
Turner Samuel
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