The stabilization of a multiplexed optical fiber interferometer system for on-line displacement precision measurement with a simple electric feedback loop is presented. Based on the characteristics of fiber Bragg gratings, the multiplexed optical fiber interferometer system includes two independent optical fiber Michelson interferometers of which the optical path is almost overlapped. One interferometer is used for the stabilization while the other interferometer is used for the measurement. A feed back signal from the feedback loop is driving a tube PZT on which one arm of the fiber interferometer is wounded. The phase-shift in the two arms of the interferometer resulting from the temperature fluctuations and other types of environmental disturbances is compensated. The bandwidth of the feedback loop is 5kHz. This makes the multiplexed fiber interferometer system stable enough for the on-line precision measurement. An active phase tracking technique is applied for signal processing to achieve high resolution. The measurement resolution of the system is less than 2nm.

Date Published: 3 February 2009
PDF: 7 pages
Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 715704 (3 February 2009); doi: 10.1117/12.805673

Published in SPIE Proceedings Vol. 7157:
2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications