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Multiplexed low-coherence optical fiber sensor system employing threshold peak detection

A multiplexed, low coherence, dual LED, multimode fiber sensor processing system, for measurement of optical path changes generated within Fabry-Perot field sensors, has been constructed and tested. Differences between reference and field sensor coherence profile peak fringe positions were measured using simple signal thresholding techniques and a 10-channel timer-counter board, triggered and stopped by zero-crossover detection signals. S/N ratio at APD detectors allowed measurement update rates in excess of 40 Hz and resolution better than 1/100th fringe. Range to resolution capability was in excess of 12 X 103:1.