Multiplexing of nonlinear fiber-optic interferometric sensors

Author

Bucholtz, F. ; Kersey, A.D. ; Dandridge, A.

Author_Institution

US Naval Res. Lab., Washington, DC, USA

Volume

7

Issue

3

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

514

Lastpage

519

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.16887

Filename

16887