| Title |
A Study on Separate Measurement of Strain and Temperature Incorporating Serial Fiber Transmission Gratings Based on High Birefringence Photonic Crystal Fiber |
| Authors |
Do Kyung Kim ; Yong Wook Lee |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.4.038 |
| Keywords |
High Birefringence Photonic Crystal Fiber; Strain; Serial Fiber Transmission Grating; Temperature |
| Abstract |
In this paper, we conducted seperate measurement of strain and temperature incorporating serial fiber transmission gratings (FTGs) based on high birefringence photonic crystal fiber (HBPCF). Two FTGs were fabricated on HBPCF in series using a CO2 laser, and the fabricated sensor have different interference spectra for orthogonal input polarizations aligned to the principal of HBPCF. Two resonance dips with the lowest transmittance in each interference spectrum were designated Dip 1 and 2 and used as sensor indicators. Dip 1 and 2 have different cladding-mode orders due to birefringence of HBPCF. The strain and temperature responses for Dip 1 and 2 of the serial HBPC-FTG were independently investigated in the strain range of 0∼2050με and the temperature range of 30∼90℃, respectively. As a result, Dip 1 and 2 exhibited linear and independent responses in the above strain and temperature range. Based on the previously measured strain and temperature sensitivities, it is possible to separately estimate any strain and temperature changes applied to the serial HBPC-FTG by measuring the wavelength shifts of Dip 1 and 2. |