Abstract
In this work a radio-frequency self-referencing WDM intensity-based fiber-optic sensor operating in reflective configuration and using virtual instrumentation is presented. The use of virtual delay lines at the reception stage, along with novel flexible self-referencing techniques, and using a single frequency, avoids all-optical or electrical-based delay lines approaches. This solution preserves the self-referencing and performance characteristics of the proposed WDM-based optical sensing topology, and leads to a more compact solution with higher flexibility for the multiple interrogation of remote sensing points in a sensor network. Results are presented for a displacement sensor demonstrating the concept feasibility.
Highlights
Intensity fiber-optic sensors (FOS) provide an optical modulation signal as the measurement and use different self-referencing techniques to avoid noise errors from undesirable intensity fluctuations or variation in losses non-correlated to the sensor modulation
The sensor topology operates in reflective configuration and takes advantage of the use of fiberBragg gratings (FBGs) and Coarse WDM (CWDM) devices
It allows a high scalability and an enhancement of the power budget as CWDM devices with low insertion losses are used for spectral splitting
Summary
Intensity fiber-optic sensors (FOS) provide an optical modulation signal as the measurement and use different self-referencing techniques to avoid noise errors from undesirable intensity fluctuations or variation in losses non-correlated to the sensor modulation They have been proved to be integrated in wavelength-division multiplexing (WDM) networks, including those based on fiber. The long fiber coils were replaced with electrical filters at the reception stage of the remote sensor network [13] This solution provided arbitrary modulation frequencies, compact sensing points and flexibility in the operation of the sensor network. A system analysis in terms of optical power budget is studied establishing the limits for remote sensor interrogation Both low-cost Analog-to-Digital converter (ADC) at the reception stage and virtual instrumentation techniques supported on a LabVIEW® platform for developing two virtual delay lines and for controlling the sensor operation are used.
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