A method of interrogation of a quasi-distributed sensor in the frequency domain is discussed. The sensor consists of a series of pairs of the identical Bragg gratings imprinted in the fiber core along its length. Each pair of the Bragg gratings performs as a low reflective Fabry-Perot interferometer producing a cosine modulated reflection spectrum within a grating's main lobe. The detector signal represents the superposition of the modulated reflection spectra which can be decomposed using the fast Fourier transform.
Frequency multiplexing of in-fiber Bragg grating sensors using tunable laser
Micro-optical Technologies for Measurement, Sensors, and Microsystems II and Optical Fiber Sensor Technologies and Applications ; 1997 ; Munich,Germany
Proc. SPIE ; 3099
1997-09-24
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Frequency multiplexing of in-fiber Bragg grating sensors using a tunable laser [3099-54]
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