Low-coherence interferometric method for measurement of displacement based on a 3 × 3 fibre-optic directional coupler

Milos C. Tomic; Jovan M. Elazar; Zoran V. Djinovic

doi:10.1088/1464-4258/4/6/384

Low-coherence interferometric method for measurement of displacement based on a 3 × 3 fibre-optic directional coupler

Milos C. Tomic, Jovan M. Elazar, Zoran V. Djinovic

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

An interferometric method for measurement of displacement based on a 3 × 3 fused fibre-optic directional coupler is described. The target position within one interference fringe is obtained with high resolution from phase-shifted signals generated in photodiodes attached to the input ports of two couplers. With the help of the spiral Lissajous representation of the same signals the degree of coherence and then the order of the interference fringe are determined. A resolution of around 50 pm over the range of 15 μm has been achieved with a superluminescent diode as a source.

Original language	English
Pages (from-to)	S381-S386
Journal	Journal of Optics A: Pure and Applied Optics
Volume	4
Issue number	6
DOIs	https://doi.org/10.1088/1464-4258/4/6/384
State	Published - 1 Jan 2002

Keywords

Displacement measurement
Low coherence interferometry
Optical fibre sensor

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1088/1464-4258/4/6/384

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abstract = "An interferometric method for measurement of displacement based on a 3 × 3 fused fibre-optic directional coupler is described. The target position within one interference fringe is obtained with high resolution from phase-shifted signals generated in photodiodes attached to the input ports of two couplers. With the help of the spiral Lissajous representation of the same signals the degree of coherence and then the order of the interference fringe are determined. A resolution of around 50 pm over the range of 15 μm has been achieved with a superluminescent diode as a source.",

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AU - Elazar, Jovan M.

AU - Djinovic, Zoran V.

PY - 2002/1/1

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N2 - An interferometric method for measurement of displacement based on a 3 × 3 fused fibre-optic directional coupler is described. The target position within one interference fringe is obtained with high resolution from phase-shifted signals generated in photodiodes attached to the input ports of two couplers. With the help of the spiral Lissajous representation of the same signals the degree of coherence and then the order of the interference fringe are determined. A resolution of around 50 pm over the range of 15 μm has been achieved with a superluminescent diode as a source.

AB - An interferometric method for measurement of displacement based on a 3 × 3 fused fibre-optic directional coupler is described. The target position within one interference fringe is obtained with high resolution from phase-shifted signals generated in photodiodes attached to the input ports of two couplers. With the help of the spiral Lissajous representation of the same signals the degree of coherence and then the order of the interference fringe are determined. A resolution of around 50 pm over the range of 15 μm has been achieved with a superluminescent diode as a source.

KW - Displacement measurement

KW - Low coherence interferometry

KW - Optical fibre sensor

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Low-coherence interferometric method for measurement of displacement based on a 3 × 3 fibre-optic directional coupler

Abstract

Keywords

ASJC Scopus subject areas

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