1. Fiber Optic Gyroscope (FOG)
Author : Brad Watanabe

2. Mechanical Gyroscope

3. Precession
Cef Pearson

4. Sagnac Effect

5. Sagnac Effect
Use the Adi Shamir paper

6. Ring Laser Gyroscope

7. Ring Laser Gyroscope Talk about how Ring Laser Gyroscope works
Problems
Mode Lock
The beat frequency is to small and now we can’t measure the beat frequency.
Sensitivity of device
No moving system
10degrees/hour
Rotating system
10^-2 degrees/hour
The best
10^-6 degrees/hours
“This is sensitivity is so great that it is enough to observe the daily effect of the moon of the earth’s rotation axis.” Adi Shamir

8. Ring Laser Gyroscope

9. Interferometric Fiber Optic Gyro

10. Interferometric Fiber Optic Gyro

11. Interferometric Fiber Optic Gyro
Pros
Longer fiber means a larger measurable phase change
Cons
Longer fiber means more loss from the fiber
Thermal Fluctuations
Change in propagation delay caused by heat
Optical Kerr Effect
Change in reflective index caused by intensity of light

12. Bibliography
Shamir, Adi, An overview of Optical Gyroscopes Theory, Practical Aspects, Applications and Future Trends, May 16, 2006
Terry Pearson, How a gyroscope works, Febuary 1997,