| Title |
Separate Measurement of Strain and Temperature Using Fiber Transmission Grating Based on Polarization-Maintaining Photonic Crystal Fiber and Faraday Rotator Reflector |
| Authors |
Do Kyung Kim ; Yong Wook Lee |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.3.040 |
| Keywords |
Fiber Transmission Grating; Faraday Rotator Reflector; Polarization-Maintaining Photonic Crystal Fiber; Strain; Temperature |
| Abstract |
In this paper, we performed separate measurement of strain and temperature using a fiber transmission grating (FTG) inscribed on polarization-maintaining photonic crystal fiber (PMPCF) by a CO2 laser and a Faraday rotator reflector (FRR). The FTG fabricated on PMPCF (referred to as a PMPC-FTG), connected in series with the FRR, has two resonance dips with different cladding-mode orders in its reflection spectrum. The wavelengths λ1 and λ2 of the two resonance dips (referred to as D1 and D2) were 1471 and 1495 nm, respectively, and D1 and D2 were utilized as sensor indicators for the separate measurement of strain and temperature. Strain and temperature responses were independently investigated for the two sensor indicators in a strain range of 0∼2548 με and a temperature range of 30∼90℃, respectively. Both D1 and D2 showed linear and uncorrelated responses to strain and temperature. Based on the previously obtained strain and temperature sensitivities, any strain and temperature changes applied to the PMPC-FTG can be estimated by measuring the wavelength shifts of D1 and D2. |