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Double-Sensor Multiplexed Reflectometric Fiber-Optic FMCW Displacement Sensor

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Abstract

Multiplexed fiber-optic sensors are very useful in practice since it enables the information to be obtained from a single sensor, which would otherwise require several sensors.1 Another important application of the multiplexed fiber-optic sensor is that one individual sensor can be used to detect the environmental effect, so that the error introduced by the change of environmental parameters (such as temperature) can be dynamically compensated, and the accuracy and long-term stability of the fiber-optic sensor can be significantly improved. Optical frequency- modulated continuous-wave (FMCW) interference generally can provide a higher accuracy and a longer dynamic range than the classical homodyne interference, because it generates a dynamic signal and thus to calibrate the fractional phase, determine the phase shift direction and count the number of the full periods is easy.2,3 This paper will introduce a practical double-sensor multiplexed fiber-optic FMCW displacement sensor.

© 2005 Optical Society of America

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