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25 November 1986Time Domain Referencing In Intensity Modulation Fiber Optic Sensing Systems
Intensity modulation sensors are classified depending on the way in which the reference and signal channels are separated: in space, wavelength (frequency), or time demains. To implement the time domain referencing different types of fiber optic (F0) loops have been used. A pulse of short duration sent into the loop results in a series of pulses of different amplitudes. The information about the measured parameter is retrieved from the relative amplitudes of pulses in the same train.