Abstract
A steel beam compressive strain sensor using single-mode-multimode-single-mode (SMS) fiber structure is demonstrated. Parallel measurements are made using an electrical resistance (ER) strain gauge along with the SMS to sense the compressive strain on the steel beam. The ER strain gauge result shows that the steel beam has an elastic limit at a compressive load of 42 kN, as predicted via calculation. On the other hand, the SMS sensor is capable to detect the elastic limit by its significant increase in the slope of the peak center wavelength from compressive strain of 0.000261–0.001986 mm/mm. Moreover, the SMS sensor exhibits compressive strain sensitivity of −1411.2 nm/(mm/mm) from the initial load until it reaches the beam elastic limit.
Highlights
Optical fiber sensors have been widely used for measuring various physical, chemical, and biological parameters
We propose to use an SMS fiber structure instead of an fiber Bragg grating (FBG) to measure compressive strain and of a steel beam
The output suggests that the SMS fiber structure has a bandpass spectral response with its peak at around 1535 nm for the wavelength range
Summary
Optical fiber sensors have been widely used for measuring various physical, chemical, and biological parameters They are compact, responsive, sensitive, stable, and resistant to electromagnetic interference [1], [2]. A fiber Bragg grating (FBG) based optical sensor is by far is the most common type of fiber sensor [7], [8]. It suffers from a narrow measurement range especially when used for strain sensing, and requires a suitable mechanical arrangement to improve its measurement range and a complex interrogation system to achieve a high wavelength resolution. A single-mode-multimode-single-mode (SMS) fiber structure has been proposed and demonstrated as a strain sensor as it generates a sufficient
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