Abstract

A fiber-optic interferometric force sensor with digital readout by fringe counting is investigated. Ambiguity in fringe counting is eliminated by employing the double-polarization method. Force Ft, transverse to the fiber axis, is measured by tension-bending-induced fiber strain. A theoretical strain-force characteristic is derived, yielding an Ft2/3 dependence of fiber strain on the transverse force that is verified experimentally.

© 1988 Optical Society of America

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