FIBER OPTIC INTERFEROMETRIC SENSOR-BASED ON SOURCE COHERENCE SYNTHESIS BY DYNAMICAL SPECTRAL FILTERING OF A SUPERLUMINESCENT SOURCE

Interferometric sensors based on source coherence synthesis have been reported for measurement of quasistatic parameters. An absolute sensin g technique has been demonstrated based on fringe visibility modulatio n using a frequency modulated laser. In this Letter, a technique is de scribed which allows to perform absolute displacement measurements in the range from tens to several hundreds of micrometers. It is based on dynamical spectral filtering of a superluminescent source which provi des frequency modulation amplitudes up to 3000 GHz. The principle is d escribed and experimentally verified for displacement measurement