Cascade fiber-optic grating-based sensor apparatus and method
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United States of America Patent
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Oct 24, 2006
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app pub date -
Mar 8, 2004
filing date -
Mar 8, 2004
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Abstract
A fiber optic sensor system includes a plurality m of sensor segments, each sensor segment further comprising a plurality n of sensor gratings for making measurements. Each sensor grating of the sensor segment operates within a unique wavelength channel, such that a plurality m of sensor segments have m sensors in each wavelength channel, and n wavelength channels, for a total of m*n sensors. A broadband optical source is gated for a duration of time which enables all of the sensors on a sensor segment to reflect optical energy corresponding to their measurement, but not long enough to receive reflected optical energy from more than one sensor on a single wavelenghth channel. In this manner, n wavelength channels of measurement can be time-multiplexed to measure m*n sensors.
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