Abstract

We propose a self-reference multiplexed fibre interferometer (MFI) by using a tunable laser and fibre Bragg grating (FBG). The optical measurement system multiplexes two Michelson fibre interferometers with shared optical path in the main part of optical system. One fibre optic interferometer is used as a reference interferometer to monitor and control the high accuracy of the measurement system under environmental perturbations. The other is used as a measurement interferometer to obtain information from the target. An active phase tracking homodyne (APTH) technique is applied for signal processing to achieve high resolution. MFI can be utilised for high precision absolute displacement measurement with different combination of wavelengths from the tuneable laser. By means of Wavelength-Division-Multiplexing (WDM) technique, MFI is also capable of realising on-line surface measurement, in which traditional stylus scanning is replaced by spatial light-wave scanning so as to greatly improve the measurement speed and robustness.

© 2004 Optical Society of America

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References

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Appl. Opt. (1)

J. Lightwave Technol. (1)

T. Okoshi, �??Polarisation-state control schemes for heterodyne or homodyne optical fibre communications,�?? J. Lightwave Technol. LT-3 1232-1237 (1985).
[CrossRef]

Meas. Sci. Technol. (2)

N. Bobroff, �??Recent advances in displacement measuring interferometry,�?? Meas. Sci. Technol. 4, 907-926 (1993).
[CrossRef]

D. Whitehouse, "Surface metrology," Meas. Sci. Technol. 8, 955-972 (1997).
[CrossRef]

Opt. Commun. (1)

G. P. Brady, K. Kalli, D. J. Webb, D. A. Jackson, L. Zhang, and I. Bennion, �??Extended-range, low coherence dual wavelength interferometry using a superfluorescent fibre source and chirped fibre Bragg gratings,�?? Opt. Commun. 134, 341-348 (1997).
[CrossRef]

Opt. Eng. (1)

Y. Zhao ,T. Zhou, D. Li. Heterodyne absolute distance interferometer with a dual-mode HeNe laser, Opt. Eng. 38, 246-249 (1999).
[CrossRef]

Opt. Express (1)

Opt. Lett. (2)

Rev. Sci. Instrum. (1)

K. Fritsch and G. Adamovsky, �??Simple circuit for feedback stabilization of a single-mode optical fiber interferometer,�?? Rev. Sci. Instrum. 52, 996-1000 (1981).
[CrossRef]

Other (1)

K. J. Scott, Three-dimensional surface topography; measurement, interpretation, and application (Jessica Kingsley Publishers Ltd, London, 1994).

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Figures (6)

Fig. 1.
Fig. 1.

The schematic of multiplexed fibre interferometer

Fig. 2.
Fig. 2.

The schematic of on-line surface measurement by means of MFI

Fig. 3.
Fig. 3.

The phase shift of fibre interferometer before and after stabilization

Fig. 4.
Fig. 4.

Experimental results of ADM by synthesised phase over 200µm measurement range

Fig. 5.
Fig. 5.

Captured optical spectra of reflected signal

Fig. 6.
Fig. 6.

Reduction of polarisation degree for eliminating the effect of polarisation fading

Equations (3)

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θ = Mod ( 2 π · n L λ )
Θ = Mod ( 2 π · n L Λ )
S = f · Δ λ d

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