Conclusion

Abstract

A prototype of the indoor and outdoor fibre Bragg grating temperature sensor incorporated with no-core fibre sensor systems were designed, developed, investigated, and evaluated successfully. A commercial FBG sensor head with 1553.865 nm center wavelength, 0.24 nm bandwidth, and 3.0 ± 0.1 cm length and 3.5 ± 0.1 cm NCF sensor were used for the purpose. The prototype FBG and NCF temperature sensor systems were capable of detecting the Bragg wavelength shifts and a no-core shift in different indoor and outdoor temperatures, in different liquids, and at different heights, either with or without the presence of focusing elements. Experimental results found a linear relationship between the Bragg wavelength shift, DkB, and temperature, T, for both transmission and reflection systems either in indoor or outdoor measurements. This is also applied in NCF systems. Thus, a prototype FBG and NCF sensing systems for temperature sensors have been developed.