Abstract
A high temperature-sensitive long-period fiber grating (LPFG) sensor fabricated by the local fictive temperature modification is proposed and demonstrated. High-frequency CO2 laser pulses scan standard single-mode fiber (SMF), and the modification zones extended to the core of SMF. Experimental results demonstrate that the LPFG temperature sensors with 600 μm grating period and 32 period numbers offer the average sensitivity of 0.084 nm/C in the temperature range of room temperature (RM) to 875°C. The LPFGs fabricated here show exponential change in terms of the spectral wavelength shift versus changes in temperature. In addition, the maximum temperature sensitivity of 0.37 nm/C is achieved by employing long-period microfiber grating (LPMFG), fabricated by the microheater brushing technique and the local fictive temperature modification. LPMFG sensor exhibits better temperature characteristics due to a thinner diameter.
Highlights
Compared with conventional electronic sensors, fiber sensors have useful advantages such as their small volume, high sensitivity, fast response, resistance to electromagnetic field interference, and the potential for remote operation [1], which have attracted more and more attention in sensing fields, including monitoring temperature [2], refractive index [3], strain [4], and viruses [5]. e measurement of temperature has great significance in the application fields of industry, scientific research, and clinical medical
We demonstrate longperiod fiber gratings (LPFGs) temperature sensors in the range of room temperature (RM) −875°C fabricated by the local fictive temperature modification via Journal of Chemistry high-frequency CO2 laser pulses
Semiconductor laser diode (SLD, orlabs, S5FC1550P-A2) used as the light source with a center wavelength of 1550 nm was connected to SMF-28 as the input port of LPFGs, and the output port of the LPFGs was connected to the optical spectrum analyzer (OSA) (Yokogawa, 6370°C) to ensure successful fabrication of LPFGs. e fabrication of LPFGs by the local fictive temperature modification was performed in a two-step process
Summary
Compared with conventional electronic sensors, fiber sensors have useful advantages such as their small volume, high sensitivity, fast response, resistance to electromagnetic field interference, and the potential for remote operation [1], which have attracted more and more attention in sensing fields, including monitoring temperature [2], refractive index [3], strain [4], and viruses [5]. e measurement of temperature has great significance in the application fields of industry, scientific research, and clinical medical. We demonstrate LPFG temperature sensors in the range of room temperature (RM) −875°C fabricated by the local fictive temperature modification via Journal of Chemistry high-frequency CO2 laser pulses. E experiments show that the temperature sensitivity of the proposed sensor could be effectively improved by fabricating the long-period microfiber gratings (LPMFGs). Nceoffre; ncelfafd,m and Λ represent effective refractive indices of core mode and the mth cladding mode and the grating period, respectively. E first term on right hand side of equation (2) is contributed to relative thermal dependence of effective indices of the core and cladding. It defines dncore/T and dnclad/T as the core and cladding thermo-optic coefficients, respectively. For the proposed LPFGs sensors, the core and cladding with positive thermo-optic coefficients are considered
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