Laser Gyroscope: Difference between revisions
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'''Sagnac effect''' | '''Sagnac effect''' | ||
When two beams of light are sent into the two ports of a ring interferometer, they travel clockwise (CW) and counter-clockwise (CCW) paths respectively. For a stationary ring interferometer, since the path length traversed by each beam is the same, this leads to complete constructive interference at the output port. | When two beams of light are sent into the two ports of a ring interferometer, they travel clockwise (CW) and counter-clockwise (CCW) paths respectively. For a stationary ring interferometer, since the path length traversed by each beam is the same (<math> L_{0} = 2\pi nR <math>), this leads to complete constructive interference at the output port. | ||
Now let's say the interferometer is spinning in the CW direction. Then there will be a difference in path length: | |||
<math> \delta L = R\omega t_{CW}<math> | |||
which results in a timing difference of: | |||
<math> t_{CW} = \frac{2\pi nR + \Delta L}{c}, t_{CCW} = \frac{2\pi nR - \Delta L}{c}</math> | |||
==Setup== | ==Setup== | ||
Revision as of 10:43, 31 January 2025
Some Description
Team members
Darren e0303300@u.nus.edu
Wen Xin e0309271@u.nus.edu
Idea
This project aims to measure some rotation by using the Sagnac effect, by using a loop of fiber as a ring interferometer.
Sagnac effect When two beams of light are sent into the two ports of a ring interferometer, they travel clockwise (CW) and counter-clockwise (CCW) paths respectively. For a stationary ring interferometer, since the path length traversed by each beam is the same (
Setup
The main setup will be a fiber based sagnac intereferometer with detection of the output done using photodiodes. We are aiming to build everything in the 1550nm wavelength range.
Measurements
....
