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A Novel Common Path Interferometric Technique for Vibration Measurement Based on Two Fiber-Optic Couplers

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1 Author(s)
Manojlovic, L.M. ; Zrenjanin Tech. Coll., Zrenjanin, Serbia

A novel common path demodulation technique for low-coherence fiber-optic sensors for vibration measurement based on two serially connected fused silica fiber-optic directional couplers is presented. A 2 × 2 coupler is used in the sensor arm and a 3 × 3 coupler serves as a receiving interferometer, providing at the same time two quadrature signals for the interferometric demodulation. A very stable output signal is obtained after the differentiate-and-cross-multiply procedure with the minimal detectable amplitude of the vibration of about 70 pm/√Hz.

Published in:

Sensors Journal, IEEE  (Volume:11 ,  Issue: 7 )