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1 2005

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Contrast sensitive fiber optic Michelson interferometer as elongation sensor

Szustakowski M., Pałka N.

Opto-Electronics Review

2005

Vol. 13, No. 1

19--26

Theoretical description of a contrast phenomenon in an unbalanced fiber optic Michelson’s interferometer with a multimode laser is shown. Required characteristic features of the contrast function for an elongation sensor are determined. Optimal spectrum for the dislocation sensor is calculated theoretically. A laser which parameters fulfilled the requirements was found. The elongation sensor based on contrast oscillations in an unbalanced fiber optic Michelson interferometer with a 3x3 coupler is described. Direct contrast-sensitive elongation measurement range limited to 200-µm long slope is expanded up to 5 mm by means of contrast oscillations linearization scheme. Elongation modulator in a reference arm of the interferometer is used. Experimental setup, signal processing scheme and software were worked out. For 1-m long sensor, the 5-mm measuring range with 28-µm uncertainty was obtained.