Title :
Multiplexing of nonlinear fiber-optic interferometric sensors
Author :
Bucholtz, F. ; Kersey, A.D. ; Dandridge, A.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
The scheme is demonstrated with a three-sensor array consisting of magnetic-field, pressure, and displacement sensors exhibiting resolutions at 1 Hz of 20 mu Oe/ square root Hz (limited by ambient noise), 0.1 kPa/ square root Hz, and 30 nm/ square root Hz, respectively. Multiplexing is accomplished by dithering each transducer at a different frequency and using parallel phase-sensitive detectors (PSD) at the interferometer output to demultiplex the information. A single Mach-Zehnder interferometer driven by a single unmodulated laser was used. Factors affecting the performance of the multiplexing scheme, including interferometric demodulation technique, PSD performance, and nonlinear transduction mechanism, are discussed.<>
Keywords :
displacement measurement; fibre optic sensors; light interferometers; magnetic field measurement; multiplexing; pressure measurement; Mach-Zehnder interferometer; displacement sensor; laser; magnetic field sensor; multiplexing; nonlinear fiber-optic interferometric sensors; nonlinear transduction mechanism; parallel phase-sensitive detectors; pressure sensor; three-sensor array; Crosstalk; Demodulation; Frequency; Magnetic materials; Mechanical sensors; Optical fiber sensors; Phase detection; Sensor arrays; Strain measurement; Transducers;
Journal_Title :
Lightwave Technology, Journal of
