Title :
Sagnac interferometer design for differential rotation measurement
Author :
Vines, L. ; Wang, G.
Author_Institution :
Norwegian Defence Res. Establ., Kjeller, Norway
Abstract :
We have demonstrated a differential setup of two fiberoptic gyroscopes in series for measuring the difference in rotation between two parallel axes. The sensor is insensitive to global rotations affecting the two axis equally. The system can be used in structural monitoring of large sized objects such as ships and airplanes. The application at hand is a direct measurement of the torsion vibrations in ships. The idea is to put a Sagnac interferometer in each end of the ship with axis parallel to the alongside axis. This can be done using two independent gyroscopes, but the system developed here reduces the two independent gyroscopes to one interferometer.
Keywords :
angular measurement; condition monitoring; fibre optic gyroscopes; light interferometers; vibration measurement; Sagnac interferometer; common mode rejection factor; counterpropagating light waves; differential rotation measurement; fiber coils; fiber optic gyroscopes; large sized objects; parallel axes; phase difference; ships; structure monitoring; torsion vibrations; Clocks; Coils; Gyroscopes; Joining processes; Marine vehicles; Optical propagation; Rotation measurement; Sagnac interferometers; Vibration measurement; Wavelength measurement;
Conference_Titel :
Optical Fiber Sensors Conference Technical Digest, 2002. Ofs 2002, 15th
Conference_Location :
Portland, OR, USA
Print_ISBN :
0-7803-7289-1
DOI :
10.1109/OFS.2002.1000640
