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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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Distributed Humidity Sensing in Concrete Based on Polymer Optical Fiber.

Xin Lu¹, Konstantin Hicke¹, Mathias Breithaupt¹

¹Bundesanstalt für Materialforschung und-Prüfung, Unter den Eichen 87, 12205 Berlin, Germany.

|November 13, 2021

Summary

This summary is machine-generated.

This study shows embedded polymer optical fibers (POF) can monitor concrete drying. Changes in light signals detected by optical time domain reflectometry (OTDR) correlate with humidity levels.

Keywords:

distributed fiber sensor embedded humidity sensors fiber optics material moisture optical time domain reflectometer

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Area of Science:

Materials Science
Civil Engineering
Optical Engineering

Background:

Accurate monitoring of concrete moisture content is crucial for structural integrity and durability.
Traditional humidity sensors can be limited in distributed sensing capabilities within concrete structures.
Polymer optical fibers (POF) offer potential for embedded sensing due to their unique optical properties.

Purpose of the Study:

To investigate the feasibility of using embedded polymer optical fibers (POF) for distributed humidity monitoring during concrete drying.
To analyze the changes in optical properties of POF due to water dissipation.
To correlate optical signal variations with concrete moisture content.

Main Methods:

Embedding POF within a concrete sample for in-situ monitoring.
Utilizing optical time domain reflectometry (OTDR) to measure Rayleigh backscattered light.
Acquiring optical signals at two wavelengths (650 nm and 500 nm).
Comparing POF sensor data with electrical humidity sensors.

Main Results:

The received optical signal at 650 nm increased as the concrete dried.
The fiber attenuation factor at 500 nm increased with decreasing moisture content.
Optical signal changes in the hygroscopic range showed good agreement with electrical humidity sensor measurements.

Conclusions:

Embedded POF can serve as a distributed humidity sensor for monitoring concrete drying processes.
Changes in optical properties of POF are sensitive to moisture variations.
The OTDR technique combined with POF offers a promising method for structural health monitoring in concrete.