Time-division multiplexing of large serial fiber-optic Bragg grating sensor arrays
2001; Optica Publishing Group; Volume: 40; Issue: 16 Linguagem: Inglês
10.1364/ao.40.002643
ISSN0003-6935
AutoresD.J.F. Cooper, Trent Coroy, Peter W. E. Smith,
Tópico(s)Advanced Fiber Laser Technologies
ResumoTime-division multiplexing is a promising method for the interrogation of fiber-optic Bragg grating sensors arrays for measurement of strain and temperature. We examine the performance of these systems to determine the parameters for high-sensitivity, low-cross-talk operation. It is shown that the performance can be greatly improved by use of a short time resolution in the demultiplexing process. We propose a new method of demultiplexing with an electro-optic modulator to read out the sensor pulses by gating the signal with 400-ps resolution. The system is demonstrated experimentally to provide 0.15-µε/ Hz strain resolution in a 50-Hz bandwidth within a full-scale range of 8000 µε. The system parameters are capable of handling at least 50 time-addressed sensors on a single fiber.
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