INTERNATIONAL SYMPOSIUM ON INFORMATION TECHNOLOGY IN OCEANOGRAPHY (ITO-98) GOA, INDIA 12-16 OCTOBER 1998

Fibre optic pressure sensor for acoustic wave sensing has been designed and fabricated using microbend deformer. A mathematical model of the same has been developed and the results are verified with the experiments in the previous work. In the current work a simple model has been proposed for the frequency analysis of the sensor. The model is based on treating fibre optic sensing region as a conventional oscillator. And oscillatory solution is applied to the equation of motion. Thus the frequency response of a fibre optic sensor has been theoretically studied. Experimental verification has also been carried out for the pressure head, which was designed and fabricated in the earlier work. The fibre optic sensor head for acoustic sensing consists of a cylindrical microbend structure over which the optical has been wound helically. Thus when the pressure wave impinges on the head the optical fibre is subjected to bending according to the design of the microbend. This causes loss in the optical field and hence intensity at the out put of the fibre. The displacement in the optical fibre is also oscillatory in unison with the interacting pressure. The change in intensity is monitored interferometric technique. The theoretical model suggests the optimum design of the microbend structure for the required frequency response. Experiments and field trials verify the results.

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Copyright© National Institute Of Oceanography, Goa,India,1998
updated on 7th July'98