Portal de Periódicos da CAPES

Detector for an optical-fiber acoustic sensor using dynamic holographic interferometry

1980; Optica Publishing Group; Volume: 5; Issue: 11 Linguagem: Inglês

10.1364/ol.5.000485

1539-4794

Trevor J. Hall, M. S. Ner, Michael A. Fiddy,

Photonic and Optical Devices

It is shown that the acoustically induced phase modulation of coherent light propagating within a multimode optical fiber may be linearly detected by an interferometer employing an unmodulated replica of the fiber beam as the reference. It is proposed that a dynamic hologram provide such a reference. This technique allows a performance comparable with that of a monomode interferometric sensor to be obtained, but with considerably relaxed alignment tolerances.