Abstract

A technique for monitoring interferometric sensors by correlation of the optical signal from the sensor with the signal from a phase-modulated reference interferometer is described. The technique is applied to temperature measurement with a fiber Fabry–Perot sensing head. We extend the 7 °C unambiguous measurement range obtained with a 1.3μm laser diode as the light source to 43 °C by adding a second laser diode emitting at 1.55 μm. Experimentally, a rms phase-measurement error of ±0.28 rad, corresponding to a temperature error of ±0.32°C, was achieved with a low-quality multimode Fabry–Perot laser. The phase error was improved to ±0.14 rad, corresponding to a temperature error of ±0.16°C, by use of a distributed-feedback laser diode.

© 1999 Optical Society of America

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References

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  1. C. E. Lee and H. F. Taylor, Electron. Lett. 24, 193 (1988).
    [CrossRef]
  2. A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
    [CrossRef]
  3. D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
    [CrossRef]

1988 (2)

C. E. Lee and H. F. Taylor, Electron. Lett. 24, 193 (1988).
[CrossRef]

D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
[CrossRef]

1986 (1)

A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
[CrossRef]

Burns, W. K.

A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
[CrossRef]

Dandridge, A.

A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
[CrossRef]

Jackson, D. A.

D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
[CrossRef]

Jones, J. D. C.

D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
[CrossRef]

Kersey, A. D.

A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
[CrossRef]

Lee, C. E.

C. E. Lee and H. F. Taylor, Electron. Lett. 24, 193 (1988).
[CrossRef]

Taylor, H. F.

C. E. Lee and H. F. Taylor, Electron. Lett. 24, 193 (1988).
[CrossRef]

Webb, D. J.

D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
[CrossRef]

Electron. Lett. (3)

C. E. Lee and H. F. Taylor, Electron. Lett. 24, 193 (1988).
[CrossRef]

A. D. Kersey, A. Dandridge, and W. K. Burns, Electron. Lett. 22, 935 (1986).
[CrossRef]

D. J. Webb, J. D. C. Jones, and D. A. Jackson, Electron. Lett. 24, 1173 (1988).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Experimental arrangement.

Fig. 2
Fig. 2

(a) Modulation scheme for the laser and (b) the modulation scheme for the PZT strip.

Fig. 3
Fig. 3

Comparison of waveforms from the S FFPI and the R FFPI for ten laser modulation cycles in the region of the PZT modulation cycle where the best match (indicated by the arrow) occurs.

Fig. 4
Fig. 4

Temperature versus phase shift obtained with (a) the multimode FP laser diode (Fujitsu FLD3C5KM with Ith=7.4 mA) and (b) the DFB laser diode (Fujitsu FLD130F1CJ with Ith=16.5 mA).

Fig. 5
Fig. 5

Temperature versus phase shift for (a) a 1.3μm laser diode (Fujitsu FLD3C5KM with Ith=7.4 mA) and a 1.55μm laser diode (Fujitsu FLD5F8KM with Ith=14 mA) and (b) the combined output from the two lasers in (a).

Equations (3)

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PS=2RS1+cosϕS,ϕS=4πnSLSν/c,
PR=2RR1+cosϕR,ϕR=4πnRLRν/c,
Δj=τk=1NPStj+kτ-PRtj+kτ2,

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