Abstract
We propose a fiber Sagnac interferometer (FSI) for precise temperature and strain discrimination. A thin core fiber (TCF) and a thin polarization maintaining fiber (TPMF) are firstly fusion spliced with two single mode fibers of a 3 dB coupler, respectively, and then fusion spliced with each other by core offset splicing to fabricate the FSI. Cladding modes are introduced to affect the temperature and strain sensitivities. The spectra composed of polarization modes and dominant cladding modes are extracted from the transmission spectra by a fast Fourier transform (FFT) filter. Temperature and strain discrimination is realized by building a simultaneous measurement matrix. Experimental results show that the temperature and strain resolutions of the proposed FSI can reach 0.0076 °C and 0.018 με, and the maximum measurement errors of temperature and strain variations are ±0.062°C and ±4.48με, respectively. The proposed sensor has promising application prospects in safety monitoring of engineering structures due to the advantages of high precision, ease of fabrication, intrinsic safety and low cost.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
