Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1992-07-10
1994-08-02
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
385 11, G01C 1964
Patent
active
053350642
ABSTRACT:
A fiber-optic gyroscope having a single mode fiber coil for sensing the rotation suffers from drift or fluctuation of scale factor of the output signals owing to spontaneous rotation of polarization of beams propagated in the fiber coil. Thus, two depolarizers are required in front of and at the back of the polarizer to avoid the fluctuation. The depolarizer of prior art consists of two birefringent materials twistedly connected with each other at an about 45.degree. inclination angle between the principal axes of one and the principal axes of the other. A conventional fiber-type depolarizer has two polarization maintaining fibers connected together. A new, simplified depolarizer is proposed. The depolarizer is built by gluing a polarization maintaining fiber to an end of the polarizer with an about 45.degree. inclination angle between the principal axes of the fiber and the principal axes of the polarizer. The depolarizer allows us to dispense with one polarization maintaining fiber and spare the operation for connecting fibers by once.
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patent: 4572608 (1986-02-01), Mochizuki et al.
patent: 4712306 (1987-12-01), Cahill et al.
patent: 5245407 (1993-09-01), Nishiura et al.
K. Bohm et al, "Low-Drift Fibre Gyro Using a Superluminescent Diode", Electronics Letters, vol. 17, No. 10, p., 352 (1981).
K. Bohm et al, "Performance of Lyot Depolarizers with Birefringent Single-Mode Fibers", Journal of Lightwave Technology, vol. Lt-1, No. 1, Mar. 1983, p. 71.
Proceeding of 7th Meeting on Lightwave Sensing Technology "Lamipol and Optic Components" May 23-24, 1991.
Nishi Yasuhiko
Nishiura Yozo
McGraw Vincent P.
Sumitomo Electric Industries Ltd.
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